stream / includes / lib / Carbon.php

Carbon.php in Stream – Activity Log & Audit Trail 3.9.2, at includes/lib/Carbon.php

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1	<?php
2
3	/*
4	* This file is part of the Carbon package.
5	*
6	* (c) Brian Nesbitt <brian@nesbot.com>
7	*
8	* For the full copyright and license information, please view the LICENSE
9	* file that was distributed with this source code.
10	*/
11
12	namespace Carbon;
13
14	use Closure;
15	use DateTime;
16	use DateTimeZone;
17	use DateInterval;
18	use DatePeriod;
19	use InvalidArgumentException;
20
21	/**
22	* A simple API extension for DateTime
23	*
24	* @property integer $year
25	* @property integer $month
26	* @property integer $day
27	* @property integer $hour
28	* @property integer $minute
29	* @property integer $second
30	* @property integer $timestamp seconds since the Unix Epoch
31	* @property-read integer $micro
32	* @property-read integer $dayOfWeek 0 (for Sunday) through 6 (for Saturday)
33	* @property-read integer $dayOfYear 0 through 365
34	* @property-read integer $weekOfMonth 1 through 6
35	* @property-read integer $weekOfYear ISO-8601 week number of year, weeks starting on Monday
36	* @property-read integer $daysInMonth number of days in the given month
37	* @property-read integer $age does a diffInYears() with default parameters
38	* @property-read integer $quarter the quarter of this instance, 1 - 4
39	* @property-read integer $offset the timezone offset in seconds from UTC
40	* @property-read integer $offsetHours the timezone offset in hours from UTC
41	* @property-read boolean $dst daylight savings time indicator, true if DST, false otherwise
42	* @property-read boolean $local checks if the timezone is local, true if local, false otherwise
43	* @property-read boolean $utc checks if the timezone is UTC, true if UTC, false otherwise
44	* @property-read string $timezoneName
45	* @property-read string $tzName
46	*
47	* @property-read DateTimeZone $timezone the current timezone
48	* @property-read DateTimeZone $tz alias of timezone
49	* @property-write DateTimeZone\|string $timezone the current timezone
50	* @property-write DateTimeZone\|string $tz alias of timezone
51	*
52	*/
53	class Carbon extends DateTime
54	{
55	/**
56	* The day constants
57	*/
58	const SUNDAY = 0;
59	const MONDAY = 1;
60	const TUESDAY = 2;
61	const WEDNESDAY = 3;
62	const THURSDAY = 4;
63	const FRIDAY = 5;
64	const SATURDAY = 6;
65
66	/**
67	* Names of days of the week.
68	*
69	* @var array
70	*/
71	protected static $days = array(
72	self::SUNDAY => 'Sunday',
73	self::MONDAY => 'Monday',
74	self::TUESDAY => 'Tuesday',
75	self::WEDNESDAY => 'Wednesday',
76	self::THURSDAY => 'Thursday',
77	self::FRIDAY => 'Friday',
78	self::SATURDAY => 'Saturday'
79	);
80
81	/**
82	* Terms used to detect if a time passed is a relative date for testing purposes
83	*
84	* @var array
85	*/
86	protected static $relativeKeywords = array(
87	'this',
88	'next',
89	'last',
90	'tomorrow',
91	'yesterday',
92	'+',
93	'-',
94	'first',
95	'last',
96	'ago'
97	);
98
99	/**
100	* Number of X in Y
101	*/
102	const YEARS_PER_CENTURY = 100;
103	const YEARS_PER_DECADE = 10;
104	const MONTHS_PER_YEAR = 12;
105	const WEEKS_PER_YEAR = 52;
106	const DAYS_PER_WEEK = 7;
107	const HOURS_PER_DAY = 24;
108	const MINUTES_PER_HOUR = 60;
109	const SECONDS_PER_MINUTE = 60;
110
111	/**
112	* Default format to use for __toString method when type juggling occurs.
113	*
114	* @var string
115	*/
116	const DEFAULT_TO_STRING_FORMAT = 'Y-m-d H:i:s';
117
118	/**
119	* Format to use for __toString method when type juggling occurs.
120	*
121	* @var string
122	*/
123	protected static $toStringFormat = self::DEFAULT_TO_STRING_FORMAT;
124
125	/**
126	* A test Carbon instance to be returned when now instances are created
127	*
128	* @var Carbon
129	*/
130	protected static $testNow;
131
132	/**
133	* Creates a DateTimeZone from a string or a DateTimeZone
134	*
135	* @param DateTimeZone\|string $object
136	*
137	* @return DateTimeZone
138	*
139	* @throws InvalidArgumentException
140	*/
141	protected static function safeCreateDateTimeZone($object)
142	{
143	if ($object instanceof DateTimeZone) {
144	return $object;
145	}
146
147	$tz = @timezone_open((string) $object);
148
149	if ($tz === false) {
150	throw new InvalidArgumentException('Unknown or bad timezone ('.$object.')');
151	}
152
153	return $tz;
154	}
155
156	///////////////////////////////////////////////////////////////////
157	//////////////////////////// CONSTRUCTORS /////////////////////////
158	///////////////////////////////////////////////////////////////////
159
160	/**
161	* Create a new Carbon instance.
162	*
163	* Please see the testing aids section (specifically static::setTestNow())
164	* for more on the possibility of this constructor returning a test instance.
165	*
166	* @param string $time
167	* @param DateTimeZone\|string $tz
168	*/
169	public function __construct($time = null, $tz = null)
170	{
171	// If the class has a test now set and we are trying to create a now()
172	// instance then override as required
173	if (static::hasTestNow() && (empty($time) \|\| $time === 'now' \|\| static::hasRelativeKeywords($time))) {
174	$testInstance = clone static::getTestNow();
175	if (static::hasRelativeKeywords($time)) {
176	$testInstance->modify($time);
177	}
178
179	//shift the time according to the given time zone
180	if ($tz !== NULL && $tz != static::getTestNow()->tz) {
181	$testInstance->setTimezone($tz);
182	} else {
183	$tz = $testInstance->tz;
184	}
185
186	$time = $testInstance->toDateTimeString();
187	}
188
189	if ($tz !== null) {
190	parent::__construct($time, static::safeCreateDateTimeZone($tz));
191	} else {
192	parent::__construct($time);
193	}
194	}
195
196	/**
197	* Create a Carbon instance from a DateTime one
198	*
199	* @param DateTime $dt
200	*
201	* @return static
202	*/
203	public static function instance(DateTime $dt)
204	{
205	return new static($dt->format('Y-m-d H:i:s.u'), $dt->getTimeZone());
206	}
207
208	/**
209	* Create a carbon instance from a string. This is an alias for the
210	* constructor that allows better fluent syntax as it allows you to do
211	* Carbon::parse('Monday next week')->fn() rather than
212	* (new Carbon('Monday next week'))->fn()
213	*
214	* @param string $time
215	* @param DateTimeZone\|string $tz
216	*
217	* @return static
218	*/
219	public static function parse($time = null, $tz = null)
220	{
221	return new static($time, $tz);
222	}
223
224	/**
225	* Get a Carbon instance for the current date and time
226	*
227	* @param DateTimeZone\|string $tz
228	*
229	* @return static
230	*/
231	public static function now($tz = null)
232	{
233	return new static(null, $tz);
234	}
235
236	/**
237	* Create a Carbon instance for today
238	*
239	* @param DateTimeZone\|string $tz
240	*
241	* @return static
242	*/
243	public static function today($tz = null)
244	{
245	return static::now($tz)->startOfDay();
246	}
247
248	/**
249	* Create a Carbon instance for tomorrow
250	*
251	* @param DateTimeZone\|string $tz
252	*
253	* @return static
254	*/
255	public static function tomorrow($tz = null)
256	{
257	return static::today($tz)->addDay();
258	}
259
260	/**
261	* Create a Carbon instance for yesterday
262	*
263	* @param DateTimeZone\|string $tz
264	*
265	* @return static
266	*/
267	public static function yesterday($tz = null)
268	{
269	return static::today($tz)->subDay();
270	}
271
272	/**
273	* Create a Carbon instance for the greatest supported date.
274	*
275	* @return Carbon
276	*/
277	public static function maxValue()
278	{
279	return static::createFromTimestamp(PHP_INT_MAX);
280	}
281
282	/**
283	* Create a Carbon instance for the lowest supported date.
284	*
285	* @return Carbon
286	*/
287	public static function minValue()
288	{
289	return static::createFromTimestamp(~PHP_INT_MAX);
290	}
291
292	/**
293	* Create a new Carbon instance from a specific date and time.
294	*
295	* If any of $year, $month or $day are set to null their now() values
296	* will be used.
297	*
298	* If $hour is null it will be set to its now() value and the default values
299	* for $minute and $second will be their now() values.
300	* If $hour is not null then the default values for $minute and $second
301	* will be 0.
302	*
303	* @param integer $year
304	* @param integer $month
305	* @param integer $day
306	* @param integer $hour
307	* @param integer $minute
308	* @param integer $second
309	* @param DateTimeZone\|string $tz
310	*
311	* @return static
312	*/
313	public static function create($year = null, $month = null, $day = null, $hour = null, $minute = null, $second = null, $tz = null)
314	{
315	$year = ($year === null) ? gmdate('Y') : $year;
316	$month = ($month === null) ? gmdate('n') : $month;
317	$day = ($day === null) ? gmdate('j') : $day;
318
319	if ($hour === null) {
320	$hour = gmdate('G');
321	$minute = ($minute === null) ? gmdate('i') : $minute;
322	$second = ($second === null) ? gmdate('s') : $second;
323	} else {
324	$minute = ($minute === null) ? 0 : $minute;
325	$second = ($second === null) ? 0 : $second;
326	}
327
328	return static::createFromFormat('Y-n-j G:i:s', sprintf('%s-%s-%s %s:%02s:%02s', $year, $month, $day, $hour, $minute, $second), $tz);
329	}
330
331	/**
332	* Create a Carbon instance from just a date. The time portion is set to now.
333	*
334	* @param integer $year
335	* @param integer $month
336	* @param integer $day
337	* @param DateTimeZone\|string $tz
338	*
339	* @return static
340	*/
341	public static function createFromDate($year = null, $month = null, $day = null, $tz = null)
342	{
343	return static::create($year, $month, $day, null, null, null, $tz);
344	}
345
346	/**
347	* Create a Carbon instance from just a time. The date portion is set to today.
348	*
349	* @param integer $hour
350	* @param integer $minute
351	* @param integer $second
352	* @param DateTimeZone\|string $tz
353	*
354	* @return static
355	*/
356	public static function createFromTime($hour = null, $minute = null, $second = null, $tz = null)
357	{
358	return static::create(null, null, null, $hour, $minute, $second, $tz);
359	}
360
361	/**
362	* Create a Carbon instance from a specific format
363	*
364	* @param string $format
365	* @param string $time
366	* @param DateTimeZone\|string $tz
367	*
368	* @return static
369	*
370	* @throws InvalidArgumentException
371	*/
372	public static function createFromFormat($format, $time, $tz = null)
373	{
374	if ($tz !== null) {
375	$dt = parent::createFromFormat($format, $time, static::safeCreateDateTimeZone($tz));
376	} else {
377	$dt = parent::createFromFormat($format, $time);
378	}
379
380	if ($dt instanceof DateTime) {
381	return static::instance($dt);
382	}
383
384	$errors = static::getLastErrors();
385	throw new InvalidArgumentException(implode(PHP_EOL, $errors['errors']));
386	}
387
388	/**
389	* Create a Carbon instance from a timestamp
390	*
391	* @param integer $timestamp
392	* @param DateTimeZone\|string $tz
393	*
394	* @return static
395	*/
396	public static function createFromTimestamp($timestamp, $tz = null)
397	{
398	return static::now($tz)->setTimestamp($timestamp);
399	}
400
401	/**
402	* Create a Carbon instance from an UTC timestamp
403	*
404	* @param integer $timestamp
405	*
406	* @return static
407	*/
408	public static function createFromTimestampUTC($timestamp)
409	{
410	return new static('@'.$timestamp);
411	}
412
413	/**
414	* Get a copy of the instance
415	*
416	* @return static
417	*/
418	public function copy()
419	{
420	return static::instance($this);
421	}
422
423	///////////////////////////////////////////////////////////////////
424	///////////////////////// GETTERS AND SETTERS /////////////////////
425	///////////////////////////////////////////////////////////////////
426
427	/**
428	* Get a part of the Carbon object
429	*
430	* @param string $name
431	*
432	* @throws InvalidArgumentException
433	*
434	* @return string\|integer\|DateTimeZone
435	*/
436	public function __get($name)
437	{
438	switch ($name) {
439	case 'year':
440	case 'month':
441	case 'day':
442	case 'hour':
443	case 'minute':
444	case 'second':
445	case 'micro':
446	case 'dayOfWeek':
447	case 'dayOfYear':
448	case 'weekOfYear':
449	case 'daysInMonth':
450	case 'timestamp':
451	$formats = array(
452	'year' => 'Y',
453	'month' => 'n',
454	'day' => 'j',
455	'hour' => 'G',
456	'minute' => 'i',
457	'second' => 's',
458	'micro' => 'u',
459	'dayOfWeek' => 'w',
460	'dayOfYear' => 'z',
461	'weekOfYear' => 'W',
462	'daysInMonth' => 't',
463	'timestamp' => 'U',
464	);
465
466	return (int) $this->format($formats[$name]);
467
468	case 'weekOfMonth':
469	return (int) ceil($this->day / self::DAYS_PER_WEEK);
470
471	case 'age':
472	return (int) $this->diffInYears();
473
474	case 'quarter':
475	return (int) ceil($this->month / 3);
476
477	case 'offset':
478	return $this->getOffset();
479
480	case 'offsetHours':
481	return $this->getOffset() / self::SECONDS_PER_MINUTE / self::MINUTES_PER_HOUR;
482
483	case 'dst':
484	return $this->format('I') == '1';
485
486	case 'local':
487	return $this->offset == $this->copy()->setTimezone(date_default_timezone_get())->offset;
488
489	case 'utc':
490	return $this->offset == 0;
491
492	case 'timezone':
493	case 'tz':
494	return $this->getTimezone();
495
496	case 'timezoneName':
497	case 'tzName':
498	return $this->getTimezone()->getName();
499
500	default:
501	throw new InvalidArgumentException(sprintf("Unknown getter '%s'", $name));
502	}
503	}
504
505	/**
506	* Check if an attribute exists on the object
507	*
508	* @param string $name
509	*
510	* @return boolean
511	*/
512	public function __isset($name)
513	{
514	try {
515	$this->__get($name);
516	} catch (InvalidArgumentException $e) {
517	return false;
518	}
519
520	return true;
521	}
522
523	/**
524	* Set a part of the Carbon object
525	*
526	* @param string $name
527	* @param string\|integer\|DateTimeZone $value
528	*
529	* @throws InvalidArgumentException
530	*/
531	public function __set($name, $value)
532	{
533	switch ($name) {
534	case 'year':
535	parent::setDate($value, $this->month, $this->day);
536	break;
537
538	case 'month':
539	parent::setDate($this->year, $value, $this->day);
540	break;
541
542	case 'day':
543	parent::setDate($this->year, $this->month, $value);
544	break;
545
546	case 'hour':
547	parent::setTime($value, $this->minute, $this->second);
548	break;
549
550	case 'minute':
551	parent::setTime($this->hour, $value, $this->second);
552	break;
553
554	case 'second':
555	parent::setTime($this->hour, $this->minute, $value);
556	break;
557
558	case 'timestamp':
559	parent::setTimestamp($value);
560	break;
561
562	case 'timezone':
563	case 'tz':
564	$this->setTimezone($value);
565	break;
566
567	default:
568	throw new InvalidArgumentException(sprintf("Unknown setter '%s'", $name));
569	}
570	}
571
572	/**
573	* Set the instance's year
574	*
575	* @param integer $value
576	*
577	* @return static
578	*/
579	public function year($value)
580	{
581	$this->year = $value;
582
583	return $this;
584	}
585
586	/**
587	* Set the instance's month
588	*
589	* @param integer $value
590	*
591	* @return static
592	*/
593	public function month($value)
594	{
595	$this->month = $value;
596
597	return $this;
598	}
599
600	/**
601	* Set the instance's day
602	*
603	* @param integer $value
604	*
605	* @return static
606	*/
607	public function day($value)
608	{
609	$this->day = $value;
610
611	return $this;
612	}
613
614	/**
615	* Set the date all together
616	*
617	* @param integer $year
618	* @param integer $month
619	* @param integer $day
620	*
621	* @return static
622	*/
623	public function setDate($year, $month, $day)
624	{
625	parent::setDate($year, $month, $day);
626
627	return $this;
628	}
629
630	/**
631	* Set the instance's hour
632	*
633	* @param integer $value
634	*
635	* @return static
636	*/
637	public function hour($value)
638	{
639	$this->hour = $value;
640
641	return $this;
642	}
643
644	/**
645	* Set the instance's minute
646	*
647	* @param integer $value
648	*
649	* @return static
650	*/
651	public function minute($value)
652	{
653	$this->minute = $value;
654
655	return $this;
656	}
657
658	/**
659	* Set the instance's second
660	*
661	* @param integer $value
662	*
663	* @return static
664	*/
665	public function second($value)
666	{
667	$this->second = $value;
668
669	return $this;
670	}
671
672	/**
673	* Set the time all together
674	*
675	* @param integer $hour
676	* @param integer $minute
677	* @param integer $second
678	* @param integer $microseconds
679	*
680	* @return static
681	*/
682	public function setTime($hour, $minute, $second = 0, $microseconds = 0 )
683	{
684	parent::setTime($hour, $minute, $second, $microseconds );
685
686	return $this;
687	}
688
689	/**
690	* Set the date and time all together
691	*
692	* @param integer $year
693	* @param integer $month
694	* @param integer $day
695	* @param integer $hour
696	* @param integer $minute
697	* @param integer $second
698	*
699	* @return static
700	*/
701	public function setDateTime($year, $month, $day, $hour, $minute, $second = 0)
702	{
703	return $this->setDate($year, $month, $day)->setTime($hour, $minute, $second);
704	}
705
706	/**
707	* Set the instance's timestamp
708	*
709	* @param integer $value
710	*
711	* @return static
712	*/
713	public function timestamp($value)
714	{
715	$this->timestamp = $value;
716
717	return $this;
718	}
719
720	/**
721	* Alias for setTimezone()
722	*
723	* @param DateTimeZone\|string $value
724	*
725	* @return static
726	*/
727	public function timezone($value)
728	{
729	return $this->setTimezone($value);
730	}
731
732	/**
733	* Alias for setTimezone()
734	*
735	* @param DateTimeZone\|string $value
736	*
737	* @return static
738	*/
739	public function tz($value)
740	{
741	return $this->setTimezone($value);
742	}
743
744	/**
745	* Set the instance's timezone from a string or object
746	*
747	* @param DateTimeZone\|string $value
748	*
749	* @return static
750	*/
751	public function setTimezone($value)
752	{
753	parent::setTimezone(static::safeCreateDateTimeZone($value));
754
755	return $this;
756	}
757
758	///////////////////////////////////////////////////////////////////
759	///////////////////////// TESTING AIDS ////////////////////////////
760	///////////////////////////////////////////////////////////////////
761
762	/**
763	* Set a Carbon instance (real or mock) to be returned when a "now"
764	* instance is created. The provided instance will be returned
765	* specifically under the following conditions:
766	* - A call to the static now() method, ex. Carbon::now()
767	* - When a null (or blank string) is passed to the constructor or parse(), ex. new Carbon(null)
768	* - When the string "now" is passed to the constructor or parse(), ex. new Carbon('now')
769	*
770	* Note the timezone parameter was left out of the examples above and
771	* has no affect as the mock value will be returned regardless of its value.
772	*
773	* To clear the test instance call this method using the default
774	* parameter of null.
775	*
776	* @param Carbon $testNow
777	*/
778	public static function setTestNow(Carbon $testNow = null)
779	{
780	static::$testNow = $testNow;
781	}
782
783	/**
784	* Get the Carbon instance (real or mock) to be returned when a "now"
785	* instance is created.
786	*
787	* @return static the current instance used for testing
788	*/
789	public static function getTestNow()
790	{
791	return static::$testNow;
792	}
793
794	/**
795	* Determine if there is a valid test instance set. A valid test instance
796	* is anything that is not null.
797	*
798	* @return boolean true if there is a test instance, otherwise false
799	*/
800	public static function hasTestNow()
801	{
802	return static::getTestNow() !== null;
803	}
804
805	/**
806	* Determine if there is a relative keyword in the time string, this is to
807	* create dates relative to now for test instances. e.g.: next tuesday
808	*
809	* @param string $time
810	*
811	* @return boolean true if there is a keyword, otherwise false
812	*/
813	public static function hasRelativeKeywords($time)
814	{
815	// skip common format with a '-' in it
816	if (preg_match('/[0-9]{4}-[0-9]{1,2}-[0-9]{1,2}/', $time) !== 1) {
817	foreach (static::$relativeKeywords as $keyword) {
818	if (stripos($time, $keyword) !== false) {
819	return true;
820	}
821	}
822	}
823
824	return false;
825	}
826
827	///////////////////////////////////////////////////////////////////
828	/////////////////////// STRING FORMATTING /////////////////////////
829	///////////////////////////////////////////////////////////////////
830
831	/**
832	* Format the instance with the current locale. You can set the current
833	* locale using setlocale() http://php.net/setlocale.
834	*
835	* @param string $format
836	*
837	* @return string
838	*/
839	public function formatLocalized($format)
840	{
841	// Check for Windows to find and replace the %e
842	// modifier correctly
843	if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN') {
844	$format = preg_replace('#(?<!%)((?:%%)*)%e#', '\1%#d', $format);
845	}
846
847	return strftime($format, $this->timestamp);
848	}
849
850	/**
851	* Reset the format used to the default when type juggling a Carbon instance to a string
852	*
853	*/
854	public static function resetToStringFormat()
855	{
856	static::setToStringFormat(self::DEFAULT_TO_STRING_FORMAT);
857	}
858
859	/**
860	* Set the default format used when type juggling a Carbon instance to a string
861	*
862	* @param string $format
863	*/
864	public static function setToStringFormat($format)
865	{
866	static::$toStringFormat = $format;
867	}
868
869	/**
870	* Format the instance as a string using the set format
871	*
872	* @return string
873	*/
874	public function __toString()
875	{
876	return $this->format(static::$toStringFormat);
877	}
878
879	/**
880	* Format the instance as date
881	*
882	* @return string
883	*/
884	public function toDateString()
885	{
886	return $this->format('Y-m-d');
887	}
888
889	/**
890	* Format the instance as a readable date
891	*
892	* @return string
893	*/
894	public function toFormattedDateString()
895	{
896	return $this->format('M j, Y');
897	}
898
899	/**
900	* Format the instance as time
901	*
902	* @return string
903	*/
904	public function toTimeString()
905	{
906	return $this->format('H:i:s');
907	}
908
909	/**
910	* Format the instance as date and time
911	*
912	* @return string
913	*/
914	public function toDateTimeString()
915	{
916	return $this->format('Y-m-d H:i:s');
917	}
918
919	/**
920	* Format the instance with day, date and time
921	*
922	* @return string
923	*/
924	public function toDayDateTimeString()
925	{
926	return $this->format('D, M j, Y g:i A');
927	}
928
929	/**
930	* Format the instance as ATOM
931	*
932	* @return string
933	*/
934	public function toAtomString()
935	{
936	return $this->format(self::ATOM);
937	}
938
939	/**
940	* Format the instance as COOKIE
941	*
942	* @return string
943	*/
944	public function toCookieString()
945	{
946	return $this->format(self::COOKIE);
947	}
948
949	/**
950	* Format the instance as ISO8601
951	*
952	* @return string
953	*/
954	public function toIso8601String()
955	{
956	return $this->format(self::ISO8601);
957	}
958
959	/**
960	* Format the instance as RFC822
961	*
962	* @return string
963	*/
964	public function toRfc822String()
965	{
966	return $this->format(self::RFC822);
967	}
968
969	/**
970	* Format the instance as RFC850
971	*
972	* @return string
973	*/
974	public function toRfc850String()
975	{
976	return $this->format(self::RFC850);
977	}
978
979	/**
980	* Format the instance as RFC1036
981	*
982	* @return string
983	*/
984	public function toRfc1036String()
985	{
986	return $this->format(self::RFC1036);
987	}
988
989	/**
990	* Format the instance as RFC1123
991	*
992	* @return string
993	*/
994	public function toRfc1123String()
995	{
996	return $this->format(self::RFC1123);
997	}
998
999	/**
1000	* Format the instance as RFC2822
1001	*
1002	* @return string
1003	*/
1004	public function toRfc2822String()
1005	{
1006	return $this->format(self::RFC2822);
1007	}
1008
1009	/**
1010	* Format the instance as RFC3339
1011	*
1012	* @return string
1013	*/
1014	public function toRfc3339String()
1015	{
1016	return $this->format(self::RFC3339);
1017	}
1018
1019	/**
1020	* Format the instance as RSS
1021	*
1022	* @return string
1023	*/
1024	public function toRssString()
1025	{
1026	return $this->format(self::RSS);
1027	}
1028
1029	/**
1030	* Format the instance as W3C
1031	*
1032	* @return string
1033	*/
1034	public function toW3cString()
1035	{
1036	return $this->format(self::W3C);
1037	}
1038
1039	///////////////////////////////////////////////////////////////////
1040	////////////////////////// COMPARISONS ////////////////////////////
1041	///////////////////////////////////////////////////////////////////
1042
1043	/**
1044	* Determines if the instance is equal to another
1045	*
1046	* @param Carbon $dt
1047	*
1048	* @return boolean
1049	*/
1050	public function eq(Carbon $dt)
1051	{
1052	return $this == $dt;
1053	}
1054
1055	/**
1056	* Determines if the instance is not equal to another
1057	*
1058	* @param Carbon $dt
1059	*
1060	* @return boolean
1061	*/
1062	public function ne(Carbon $dt)
1063	{
1064	return !$this->eq($dt);
1065	}
1066
1067	/**
1068	* Determines if the instance is greater (after) than another
1069	*
1070	* @param Carbon $dt
1071	*
1072	* @return boolean
1073	*/
1074	public function gt(Carbon $dt)
1075	{
1076	return $this > $dt;
1077	}
1078
1079	/**
1080	* Determines if the instance is greater (after) than or equal to another
1081	*
1082	* @param Carbon $dt
1083	*
1084	* @return boolean
1085	*/
1086	public function gte(Carbon $dt)
1087	{
1088	return $this >= $dt;
1089	}
1090
1091	/**
1092	* Determines if the instance is less (before) than another
1093	*
1094	* @param Carbon $dt
1095	*
1096	* @return boolean
1097	*/
1098	public function lt(Carbon $dt)
1099	{
1100	return $this < $dt;
1101	}
1102
1103	/**
1104	* Determines if the instance is less (before) or equal to another
1105	*
1106	* @param Carbon $dt
1107	*
1108	* @return boolean
1109	*/
1110	public function lte(Carbon $dt)
1111	{
1112	return $this <= $dt;
1113	}
1114
1115	/**
1116	* Determines if the instance is between two others
1117	*
1118	* @param Carbon $dt1
1119	* @param Carbon $dt2
1120	* @param boolean $equal Indicates if a > and < comparison should be used or <= or >=
1121	*
1122	* @return boolean
1123	*/
1124	public function between(Carbon $dt1, Carbon $dt2, $equal = true)
1125	{
1126	if ($dt1->gt($dt2)) {
1127	$temp = $dt1;
1128	$dt1 = $dt2;
1129	$dt2 = $temp;
1130	}
1131
1132	if ($equal) {
1133	return $this->gte($dt1) && $this->lte($dt2);
1134	} else {
1135	return $this->gt($dt1) && $this->lt($dt2);
1136	}
1137	}
1138
1139	/**
1140	* Get the minimum instance between a given instance (default now) and the current instance.
1141	*
1142	* @param Carbon $dt
1143	*
1144	* @return static
1145	*/
1146	public function min(Carbon $dt = null)
1147	{
1148	$dt = ($dt === null) ? static::now($this->tz) : $dt;
1149
1150	return $this->lt($dt) ? $this : $dt;
1151	}
1152
1153	/**
1154	* Get the maximum instance between a given instance (default now) and the current instance.
1155	*
1156	* @param Carbon $dt
1157	*
1158	* @return static
1159	*/
1160	public function max(Carbon $dt = null)
1161	{
1162	$dt = ($dt === null) ? static::now($this->tz) : $dt;
1163
1164	return $this->gt($dt) ? $this : $dt;
1165	}
1166
1167	/**
1168	* Determines if the instance is a weekday
1169	*
1170	* @return boolean
1171	*/
1172	public function isWeekday()
1173	{
1174	return ($this->dayOfWeek != self::SUNDAY && $this->dayOfWeek != self::SATURDAY);
1175	}
1176
1177	/**
1178	* Determines if the instance is a weekend day
1179	*
1180	* @return boolean
1181	*/
1182	public function isWeekend()
1183	{
1184	return !$this->isWeekDay();
1185	}
1186
1187	/**
1188	* Determines if the instance is yesterday
1189	*
1190	* @return boolean
1191	*/
1192	public function isYesterday()
1193	{
1194	return $this->toDateString() === static::yesterday($this->tz)->toDateString();
1195	}
1196
1197	/**
1198	* Determines if the instance is today
1199	*
1200	* @return boolean
1201	*/
1202	public function isToday()
1203	{
1204	return $this->toDateString() === static::now($this->tz)->toDateString();
1205	}
1206
1207	/**
1208	* Determines if the instance is tomorrow
1209	*
1210	* @return boolean
1211	*/
1212	public function isTomorrow()
1213	{
1214	return $this->toDateString() === static::tomorrow($this->tz)->toDateString();
1215	}
1216
1217	/**
1218	* Determines if the instance is in the future, ie. greater (after) than now
1219	*
1220	* @return boolean
1221	*/
1222	public function isFuture()
1223	{
1224	return $this->gt(static::now($this->tz));
1225	}
1226
1227	/**
1228	* Determines if the instance is in the past, ie. less (before) than now
1229	*
1230	* @return boolean
1231	*/
1232	public function isPast()
1233	{
1234	return $this->lt(static::now($this->tz));
1235	}
1236
1237	/**
1238	* Determines if the instance is a leap year
1239	*
1240	* @return boolean
1241	*/
1242	public function isLeapYear()
1243	{
1244	return $this->format('L') == '1';
1245	}
1246
1247	/**
1248	* Checks if the passed in date is the same day as the instance current day.
1249	*
1250	* @param Carbon $dt
1251	* @return boolean
1252	*/
1253	public function isSameDay(Carbon $dt)
1254	{
1255	return $this->toDateString() === $dt->toDateString();
1256	}
1257
1258	///////////////////////////////////////////////////////////////////
1259	/////////////////// ADDITIONS AND SUBSTRACTIONS ///////////////////
1260	///////////////////////////////////////////////////////////////////
1261
1262	/**
1263	* Add years to the instance. Positive $value travel forward while
1264	* negative $value travel into the past.
1265	*
1266	* @param integer $value
1267	*
1268	* @return static
1269	*/
1270	public function addYears($value)
1271	{
1272	return $this->modify((int) $value . ' year');
1273	}
1274
1275	/**
1276	* Add a year to the instance
1277	*
1278	* @return static
1279	*/
1280	public function addYear()
1281	{
1282	return $this->addYears(1);
1283	}
1284
1285	/**
1286	* Remove a year from the instance
1287	*
1288	* @return static
1289	*/
1290	public function subYear()
1291	{
1292	return $this->addYears(-1);
1293	}
1294
1295	/**
1296	* Remove years from the instance.
1297	*
1298	* @param integer $value
1299	*
1300	* @return static
1301	*/
1302	public function subYears($value)
1303	{
1304	return $this->addYears(-1 * $value);
1305	}
1306
1307	/**
1308	* Add months to the instance. Positive $value travels forward while
1309	* negative $value travels into the past.
1310	*
1311	* @param integer $value
1312	*
1313	* @return static
1314	*/
1315	public function addMonths($value)
1316	{
1317	return $this->modify((int) $value . ' month');
1318	}
1319
1320	/**
1321	* Add a month to the instance
1322	*
1323	* @return static
1324	*/
1325	public function addMonth()
1326	{
1327	return $this->addMonths(1);
1328	}
1329
1330	/**
1331	* Remove a month from the instance
1332	*
1333	* @return static
1334	*/
1335	public function subMonth()
1336	{
1337	return $this->addMonths(-1);
1338	}
1339
1340	/**
1341	* Remove months from the instance
1342	*
1343	* @param integer $value
1344	*
1345	* @return static
1346	*/
1347	public function subMonths($value)
1348	{
1349	return $this->addMonths(-1 * $value);
1350	}
1351
1352	/**
1353	* Add days to the instance. Positive $value travels forward while
1354	* negative $value travels into the past.
1355	*
1356	* @param integer $value
1357	*
1358	* @return static
1359	*/
1360	public function addDays($value)
1361	{
1362	return $this->modify((int) $value . ' day');
1363	}
1364
1365	/**
1366	* Add a day to the instance
1367	*
1368	* @return static
1369	*/
1370	public function addDay()
1371	{
1372	return $this->addDays(1);
1373	}
1374
1375	/**
1376	* Remove a day from the instance
1377	*
1378	* @return static
1379	*/
1380	public function subDay()
1381	{
1382	return $this->addDays(-1);
1383	}
1384
1385	/**
1386	* Remove days from the instance
1387	*
1388	* @param integer $value
1389	*
1390	* @return static
1391	*/
1392	public function subDays($value)
1393	{
1394	return $this->addDays(-1 * $value);
1395	}
1396
1397	/**
1398	* Add weekdays to the instance. Positive $value travels forward while
1399	* negative $value travels into the past.
1400	*
1401	* @param integer $value
1402	*
1403	* @return static
1404	*/
1405	public function addWeekdays($value)
1406	{
1407	return $this->modify((int) $value . ' weekday');
1408	}
1409
1410	/**
1411	* Add a weekday to the instance
1412	*
1413	* @return static
1414	*/
1415	public function addWeekday()
1416	{
1417	return $this->addWeekdays(1);
1418	}
1419
1420	/**
1421	* Remove a weekday from the instance
1422	*
1423	* @return static
1424	*/
1425	public function subWeekday()
1426	{
1427	return $this->addWeekdays(-1);
1428	}
1429
1430	/**
1431	* Remove weekdays from the instance
1432	*
1433	* @param integer $value
1434	*
1435	* @return static
1436	*/
1437	public function subWeekdays($value)
1438	{
1439	return $this->addWeekdays(-1 * $value);
1440	}
1441
1442	/**
1443	* Add weeks to the instance. Positive $value travels forward while
1444	* negative $value travels into the past.
1445	*
1446	* @param integer $value
1447	*
1448	* @return static
1449	*/
1450	public function addWeeks($value)
1451	{
1452	return $this->modify((int) $value . ' week');
1453	}
1454
1455	/**
1456	* Add a week to the instance
1457	*
1458	* @return static
1459	*/
1460	public function addWeek()
1461	{
1462	return $this->addWeeks(1);
1463	}
1464
1465	/**
1466	* Remove a week from the instance
1467	*
1468	* @return static
1469	*/
1470	public function subWeek()
1471	{
1472	return $this->addWeeks(-1);
1473	}
1474
1475	/**
1476	* Remove weeks to the instance
1477	*
1478	* @param integer $value
1479	*
1480	* @return static
1481	*/
1482	public function subWeeks($value)
1483	{
1484	return $this->addWeeks(-1 * $value);
1485	}
1486
1487	/**
1488	* Add hours to the instance. Positive $value travels forward while
1489	* negative $value travels into the past.
1490	*
1491	* @param integer $value
1492	*
1493	* @return static
1494	*/
1495	public function addHours($value)
1496	{
1497	return $this->modify((int) $value . ' hour');
1498	}
1499
1500	/**
1501	* Add an hour to the instance
1502	*
1503	* @return static
1504	*/
1505	public function addHour()
1506	{
1507	return $this->addHours(1);
1508	}
1509
1510	/**
1511	* Remove an hour from the instance
1512	*
1513	* @return static
1514	*/
1515	public function subHour()
1516	{
1517	return $this->addHours(-1);
1518	}
1519
1520	/**
1521	* Remove hours from the instance
1522	*
1523	* @param integer $value
1524	*
1525	* @return static
1526	*/
1527	public function subHours($value)
1528	{
1529	return $this->addHours(-1 * $value);
1530	}
1531
1532	/**
1533	* Add minutes to the instance. Positive $value travels forward while
1534	* negative $value travels into the past.
1535	*
1536	* @param integer $value
1537	*
1538	* @return static
1539	*/
1540	public function addMinutes($value)
1541	{
1542	return $this->modify((int) $value . ' minute');
1543	}
1544
1545	/**
1546	* Add a minute to the instance
1547	*
1548	* @return static
1549	*/
1550	public function addMinute()
1551	{
1552	return $this->addMinutes(1);
1553	}
1554
1555	/**
1556	* Remove a minute from the instance
1557	*
1558	* @return static
1559	*/
1560	public function subMinute()
1561	{
1562	return $this->addMinutes(-1);
1563	}
1564
1565	/**
1566	* Remove minutes from the instance
1567	*
1568	* @param integer $value
1569	*
1570	* @return static
1571	*/
1572	public function subMinutes($value)
1573	{
1574	return $this->addMinutes(-1 * $value);
1575	}
1576
1577	/**
1578	* Add seconds to the instance. Positive $value travels forward while
1579	* negative $value travels into the past.
1580	*
1581	* @param integer $value
1582	*
1583	* @return static
1584	*/
1585	public function addSeconds($value)
1586	{
1587	return $this->modify((int) $value . ' second');
1588	}
1589
1590	/**
1591	* Add a second to the instance
1592	*
1593	* @return static
1594	*/
1595	public function addSecond()
1596	{
1597	return $this->addSeconds(1);
1598	}
1599
1600	/**
1601	* Remove a second from the instance
1602	*
1603	* @return static
1604	*/
1605	public function subSecond()
1606	{
1607	return $this->addSeconds(-1);
1608	}
1609
1610	/**
1611	* Remove seconds from the instance
1612	*
1613	* @param integer $value
1614	*
1615	* @return static
1616	*/
1617	public function subSeconds($value)
1618	{
1619	return $this->addSeconds(-1 * $value);
1620	}
1621
1622	///////////////////////////////////////////////////////////////////
1623	/////////////////////////// DIFFERENCES ///////////////////////////
1624	///////////////////////////////////////////////////////////////////
1625
1626	/**
1627	* Get the difference in years
1628	*
1629	* @param Carbon $dt
1630	* @param boolean $abs Get the absolute of the difference
1631	*
1632	* @return integer
1633	*/
1634	public function diffInYears(Carbon $dt = null, $abs = true)
1635	{
1636	$dt = ($dt === null) ? static::now($this->tz) : $dt;
1637
1638	return (int) $this->diff($dt, $abs)->format('%r%y');
1639	}
1640
1641	/**
1642	* Get the difference in months
1643	*
1644	* @param Carbon $dt
1645	* @param boolean $abs Get the absolute of the difference
1646	*
1647	* @return integer
1648	*/
1649	public function diffInMonths(Carbon $dt = null, $abs = true)
1650	{
1651	$dt = ($dt === null) ? static::now($this->tz) : $dt;
1652
1653	return $this->diffInYears($dt, $abs) * self::MONTHS_PER_YEAR + $this->diff($dt, $abs)->format('%r%m');
1654	}
1655
1656	/**
1657	* Get the difference in weeks
1658	*
1659	* @param Carbon $dt
1660	* @param boolean $abs Get the absolute of the difference
1661	*
1662	* @return integer
1663	*/
1664	public function diffInWeeks(Carbon $dt = null, $abs = true)
1665	{
1666	return (int) ($this->diffInDays($dt, $abs) / self::DAYS_PER_WEEK);
1667	}
1668
1669	/**
1670	* Get the difference in days
1671	*
1672	* @param Carbon $dt
1673	* @param boolean $abs Get the absolute of the difference
1674	*
1675	* @return integer
1676	*/
1677	public function diffInDays(Carbon $dt = null, $abs = true)
1678	{
1679	$dt = ($dt === null) ? static::now($this->tz) : $dt;
1680
1681	return (int) $this->diff($dt, $abs)->format('%r%a');
1682	}
1683
1684	/**
1685	* Get the difference in days using a filter closure
1686	*
1687	* @param Closure $callback
1688	* @param Carbon $dt
1689	* @param boolean $abs Get the absolute of the difference
1690	*
1691	* @return int
1692	*/
1693	public function diffInDaysFiltered(Closure $callback, Carbon $dt = null, $abs = true)
1694	{
1695	$start = $this;
1696	$end = ($dt === null) ? static::now($this->tz) : $dt;
1697	$inverse = false;
1698
1699	if ($end < $start) {
1700	$start = $end;
1701	$end = $this;
1702	$inverse = true;
1703	}
1704
1705	$period = new DatePeriod($start, new DateInterval('P1D'), $end);
1706	$days = array_filter(iterator_to_array($period), function (DateTime $date) use ($callback) {
1707	return call_user_func($callback, Carbon::instance($date));
1708	});
1709
1710	$diff = count($days);
1711
1712	return $inverse && !$abs ? -$diff : $diff;
1713	}
1714
1715	/**
1716	* Get the difference in weekdays
1717	*
1718	* @param Carbon $dt
1719	* @param boolean $abs Get the absolute of the difference
1720	*
1721	* @return int
1722	*/
1723	public function diffInWeekdays(Carbon $dt = null, $abs = true)
1724	{
1725	return $this->diffInDaysFiltered(function (Carbon $date) {
1726	return $date->isWeekday();
1727	}, $dt, $abs);
1728	}
1729
1730	/**
1731	* Get the difference in weekend days using a filter
1732	*
1733	* @param Carbon $dt
1734	* @param boolean $abs Get the absolute of the difference
1735	*
1736	* @return int
1737	*/
1738	public function diffInWeekendDays(Carbon $dt = null, $abs = true)
1739	{
1740	return $this->diffInDaysFiltered(function (Carbon $date) {
1741	return $date->isWeekend();
1742	}, $dt, $abs);
1743	}
1744
1745	/**
1746	* Get the difference in hours
1747	*
1748	* @param Carbon $dt
1749	* @param boolean $abs Get the absolute of the difference
1750	*
1751	* @return integer
1752	*/
1753	public function diffInHours(Carbon $dt = null, $abs = true)
1754	{
1755	return (int) ($this->diffInSeconds($dt, $abs) / self::SECONDS_PER_MINUTE / self::MINUTES_PER_HOUR);
1756	}
1757
1758	/**
1759	* Get the difference in minutes
1760	*
1761	* @param Carbon $dt
1762	* @param boolean $abs Get the absolute of the difference
1763	*
1764	* @return integer
1765	*/
1766	public function diffInMinutes(Carbon $dt = null, $abs = true)
1767	{
1768	return (int) ($this->diffInSeconds($dt, $abs) / self::SECONDS_PER_MINUTE);
1769	}
1770
1771	/**
1772	* Get the difference in seconds
1773	*
1774	* @param Carbon $dt
1775	* @param boolean $abs Get the absolute of the difference
1776	*
1777	* @return integer
1778	*/
1779	public function diffInSeconds(Carbon $dt = null, $abs = true)
1780	{
1781	$value = (($dt === null) ? time() : $dt->getTimestamp()) - $this->getTimestamp();
1782
1783	return $abs ? abs($value) : $value;
1784	}
1785
1786	/**
1787	* Get the difference in a human readable format.
1788	*
1789	* When comparing a value in the past to default now:
1790	* 1 hour ago
1791	* 5 months ago
1792	*
1793	* When comparing a value in the future to default now:
1794	* 1 hour from now
1795	* 5 months from now
1796	*
1797	* When comparing a value in the past to another value:
1798	* 1 hour before
1799	* 5 months before
1800	*
1801	* When comparing a value in the future to another value:
1802	* 1 hour after
1803	* 5 months after
1804	*
1805	* @param Carbon $other
1806	*
1807	* @return string
1808	*/
1809	public function diffForHumans(Carbon $other = null)
1810	{
1811	$isNow = $other === null;
1812
1813	if ($isNow) {
1814	$other = static::now($this->tz);
1815	}
1816
1817	$isFuture = $this->gt($other);
1818
1819	$delta = $other->diffInSeconds($this);
1820
1821	// a little weeks per month, 365 days per year... good enough!!
1822	$divs = array(
1823	'second' => self::SECONDS_PER_MINUTE,
1824	'minute' => self::MINUTES_PER_HOUR,
1825	'hour' => self::HOURS_PER_DAY,
1826	'day' => self::DAYS_PER_WEEK,
1827	'week' => 30 / self::DAYS_PER_WEEK,
1828	'month' => self::MONTHS_PER_YEAR
1829	);
1830
1831	$unit = 'year';
1832
1833	foreach ($divs as $divUnit => $divValue) {
1834	if ($delta < $divValue) {
1835	$unit = $divUnit;
1836	break;
1837	}
1838
1839	$delta = $delta / $divValue;
1840	}
1841
1842	$delta = (int) $delta;
1843
1844	if ($delta == 0) {
1845	$delta = 1;
1846	}
1847
1848	$txt = $delta . ' ' . $unit;
1849	$txt .= $delta == 1 ? '' : 's';
1850
1851	if ($isNow) {
1852	if ($isFuture) {
1853	return $txt . ' from now';
1854	}
1855
1856	return $txt . ' ago';
1857	}
1858
1859	if ($isFuture) {
1860	return $txt . ' after';
1861	}
1862
1863	return $txt . ' before';
1864	}
1865
1866	///////////////////////////////////////////////////////////////////
1867	//////////////////////////// MODIFIERS ////////////////////////////
1868	///////////////////////////////////////////////////////////////////
1869
1870	/**
1871	* Resets the time to 00:00:00
1872	*
1873	* @return static
1874	*/
1875	public function startOfDay()
1876	{
1877	return $this->hour(0)->minute(0)->second(0);
1878	}
1879
1880	/**
1881	* Resets the time to 23:59:59
1882	*
1883	* @return static
1884	*/
1885	public function endOfDay()
1886	{
1887	return $this->hour(23)->minute(59)->second(59);
1888	}
1889
1890	/**
1891	* Resets the date to the first day of the month and the time to 00:00:00
1892	*
1893	* @return static
1894	*/
1895	public function startOfMonth()
1896	{
1897	return $this->startOfDay()->day(1);
1898	}
1899
1900	/**
1901	* Resets the date to end of the month and time to 23:59:59
1902	*
1903	* @return static
1904	*/
1905	public function endOfMonth()
1906	{
1907	return $this->day($this->daysInMonth)->endOfDay();
1908	}
1909
1910	/**
1911	* Resets the date to the first day of the year and the time to 00:00:00
1912	*
1913	* @return static
1914	*/
1915	public function startOfYear()
1916	{
1917	return $this->month(1)->startOfMonth();
1918	}
1919
1920	/**
1921	* Resets the date to end of the year and time to 23:59:59
1922	*
1923	* @return static
1924	*/
1925	public function endOfYear()
1926	{
1927	return $this->month(self::MONTHS_PER_YEAR)->endOfMonth();
1928	}
1929
1930	/**
1931	* Resets the date to the first day of the decade and the time to 00:00:00
1932	*
1933	* @return static
1934	*/
1935	public function startOfDecade()
1936	{
1937	return $this->startOfYear()->year($this->year - $this->year % self::YEARS_PER_DECADE);
1938	}
1939
1940	/**
1941	* Resets the date to end of the decade and time to 23:59:59
1942	*
1943	* @return static
1944	*/
1945	public function endOfDecade()
1946	{
1947	return $this->endOfYear()->year($this->year - $this->year % self::YEARS_PER_DECADE + self::YEARS_PER_DECADE - 1);
1948	}
1949
1950	/**
1951	* Resets the date to the first day of the century and the time to 00:00:00
1952	*
1953	* @return static
1954	*/
1955	public function startOfCentury()
1956	{
1957	return $this->startOfYear()->year($this->year - $this->year % self::YEARS_PER_CENTURY);
1958	}
1959
1960	/**
1961	* Resets the date to end of the century and time to 23:59:59
1962	*
1963	* @return static
1964	*/
1965	public function endOfCentury()
1966	{
1967	return $this->endOfYear()->year($this->year - $this->year % self::YEARS_PER_CENTURY + self::YEARS_PER_CENTURY - 1);
1968	}
1969
1970	/**
1971	* Resets the date to the first day of the ISO-8601 week (Monday) and the time to 00:00:00
1972	*
1973	* @return static
1974	*/
1975	public function startOfWeek()
1976	{
1977	if ($this->dayOfWeek != self::MONDAY) $this->previous(self::MONDAY);
1978	return $this->startOfDay();
1979	}
1980
1981	/**
1982	* Resets the date to end of the ISO-8601 week (Sunday) and time to 23:59:59
1983	*
1984	* @return static
1985	*/
1986	public function endOfWeek()
1987	{
1988	if ($this->dayOfWeek != self::SUNDAY) $this->next(self::SUNDAY);
1989	return $this->endOfDay();
1990	}
1991
1992	/**
1993	* Modify to the next occurance of a given day of the week.
1994	* If no dayOfWeek is provided, modify to the next occurance
1995	* of the current day of the week. Use the supplied consts
1996	* to indicate the desired dayOfWeek, ex. static::MONDAY.
1997	*
1998	* @param int $dayOfWeek
1999	*
2000	* @return mixed
2001	*/
2002	public function next($dayOfWeek = null)
2003	{
2004	if ($dayOfWeek === null) {
2005	$dayOfWeek = $this->dayOfWeek;
2006	}
2007
2008	return $this->startOfDay()->modify('next ' . self::$days[$dayOfWeek]);
2009	}
2010
2011	/**
2012	* Modify to the previous occurance of a given day of the week.
2013	* If no dayOfWeek is provided, modify to the previous occurance
2014	* of the current day of the week. Use the supplied consts
2015	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2016	*
2017	* @param int $dayOfWeek
2018	*
2019	* @return mixed
2020	*/
2021	public function previous($dayOfWeek = null)
2022	{
2023	if ($dayOfWeek === null) {
2024	$dayOfWeek = $this->dayOfWeek;
2025	}
2026
2027	return $this->startOfDay()->modify('last ' . self::$days[$dayOfWeek]);
2028	}
2029
2030	/**
2031	* Modify to the first occurance of a given day of the week
2032	* in the current month. If no dayOfWeek is provided, modify to the
2033	* first day of the current month. Use the supplied consts
2034	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2035	*
2036	* @param int $dayOfWeek
2037	*
2038	* @return mixed
2039	*/
2040	public function firstOfMonth($dayOfWeek = null)
2041	{
2042	$this->startOfDay();
2043
2044	if ($dayOfWeek === null) {
2045	return $this->day(1);
2046	}
2047
2048	return $this->modify('first ' . self::$days[$dayOfWeek] . ' of ' . $this->format('F') . ' ' . $this->year);
2049	}
2050
2051	/**
2052	* Modify to the last occurance of a given day of the week
2053	* in the current month. If no dayOfWeek is provided, modify to the
2054	* last day of the current month. Use the supplied consts
2055	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2056	*
2057	* @param int $dayOfWeek
2058	*
2059	* @return mixed
2060	*/
2061	public function lastOfMonth($dayOfWeek = null)
2062	{
2063	$this->startOfDay();
2064
2065	if ($dayOfWeek === null) {
2066	return $this->day($this->daysInMonth);
2067	}
2068
2069	return $this->modify('last ' . self::$days[$dayOfWeek] . ' of ' . $this->format('F') . ' ' . $this->year);
2070	}
2071
2072	/**
2073	* Modify to the given occurance of a given day of the week
2074	* in the current month. If the calculated occurance is outside the scope
2075	* of the current month, then return false and no modifications are made.
2076	* Use the supplied consts to indicate the desired dayOfWeek, ex. static::MONDAY.
2077	*
2078	* @param int $nth
2079	* @param int $dayOfWeek
2080	*
2081	* @return mixed
2082	*/
2083	public function nthOfMonth($nth, $dayOfWeek)
2084	{
2085	$dt = $this->copy()->firstOfMonth();
2086	$check = $dt->format('Y-m');
2087	$dt->modify('+' . $nth . ' ' . self::$days[$dayOfWeek]);
2088
2089	return ($dt->format('Y-m') === $check) ? $this->modify($dt) : false;
2090	}
2091
2092	/**
2093	* Modify to the first occurance of a given day of the week
2094	* in the current quarter. If no dayOfWeek is provided, modify to the
2095	* first day of the current quarter. Use the supplied consts
2096	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2097	*
2098	* @param int $dayOfWeek
2099	*
2100	* @return mixed
2101	*/
2102	public function firstOfQuarter($dayOfWeek = null)
2103	{
2104	return $this->day(1)->month($this->quarter * 3 - 2)->firstOfMonth($dayOfWeek);
2105	}
2106
2107	/**
2108	* Modify to the last occurance of a given day of the week
2109	* in the current quarter. If no dayOfWeek is provided, modify to the
2110	* last day of the current quarter. Use the supplied consts
2111	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2112	*
2113	* @param int $dayOfWeek
2114	*
2115	* @return mixed
2116	*/
2117	public function lastOfQuarter($dayOfWeek = null)
2118	{
2119	return $this->day(1)->month($this->quarter * 3)->lastOfMonth($dayOfWeek);
2120	}
2121
2122	/**
2123	* Modify to the given occurance of a given day of the week
2124	* in the current quarter. If the calculated occurance is outside the scope
2125	* of the current quarter, then return false and no modifications are made.
2126	* Use the supplied consts to indicate the desired dayOfWeek, ex. static::MONDAY.
2127	*
2128	* @param int $nth
2129	* @param int $dayOfWeek
2130	*
2131	* @return mixed
2132	*/
2133	public function nthOfQuarter($nth, $dayOfWeek)
2134	{
2135	$dt = $this->copy()->day(1)->month($this->quarter * 3);
2136	$last_month = $dt->month;
2137	$year = $dt->year;
2138	$dt->firstOfQuarter()->modify('+' . $nth . ' ' . self::$days[$dayOfWeek]);
2139
2140	return ($last_month < $dt->month \|\| $year !== $dt->year) ? false : $this->modify($dt);
2141	}
2142
2143	/**
2144	* Modify to the first occurance of a given day of the week
2145	* in the current year. If no dayOfWeek is provided, modify to the
2146	* first day of the current year. Use the supplied consts
2147	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2148	*
2149	* @param int $dayOfWeek
2150	*
2151	* @return mixed
2152	*/
2153	public function firstOfYear($dayOfWeek = null)
2154	{
2155	return $this->month(1)->firstOfMonth($dayOfWeek);
2156	}
2157
2158	/**
2159	* Modify to the last occurance of a given day of the week
2160	* in the current year. If no dayOfWeek is provided, modify to the
2161	* last day of the current year. Use the supplied consts
2162	* to indicate the desired dayOfWeek, ex. static::MONDAY.
2163	*
2164	* @param int $dayOfWeek
2165	*
2166	* @return mixed
2167	*/
2168	public function lastOfYear($dayOfWeek = null)
2169	{
2170	return $this->month(self::MONTHS_PER_YEAR)->lastOfMonth($dayOfWeek);
2171	}
2172
2173	/**
2174	* Modify to the given occurance of a given day of the week
2175	* in the current year. If the calculated occurance is outside the scope
2176	* of the current year, then return false and no modifications are made.
2177	* Use the supplied consts to indicate the desired dayOfWeek, ex. static::MONDAY.
2178	*
2179	* @param int $nth
2180	* @param int $dayOfWeek
2181	*
2182	* @return mixed
2183	*/
2184	public function nthOfYear($nth, $dayOfWeek)
2185	{
2186	$dt = $this->copy()->firstOfYear()->modify('+' . $nth . ' ' . self::$days[$dayOfWeek]);
2187
2188	return $this->year == $dt->year ? $this->modify($dt) : false;
2189	}
2190
2191	/**
2192	* Modify the current instance to the average of a given instance (default now) and the current instance.
2193	*
2194	* @param Carbon $dt
2195	*
2196	* @return static
2197	*/
2198	public function average(Carbon $dt = null)
2199	{
2200	$dt = ($dt === null) ? static::now($this->tz) : $dt;
2201
2202	return $this->addSeconds((int) ($this->diffInSeconds($dt, false) / 2));
2203	}
2204
2205	/**
2206	* Check if its the birthday. Compares the date/month values of the two dates.
2207	* @param Carbon $dt
2208	* @return boolean
2209	*/
2210	public function isBirthday(Carbon $dt)
2211	{
2212	return $this->month === $dt->month && $this->day === $dt->day;
2213	}
2214	}
2215