How to get the different format of the date in php?

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Written By geekerhub

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date() function is used to a string formatted according to the given format string using the given integer timestamp or the current time if no timestamp is given.

It has two parameters:

format
Format accepted by DateTimeInterface::format().

timestamp
The optional timestamp parameter is an int Unix timestamp that defaults to the current local time if timestamp is omitted or null. In other words, it defaults to the value of time().

<?php
	// Assuming today is March 10th, 2001, 5:16:18 pm, and that we are in the
	// Mountain Standard Time (MST) Time Zone

	$today = date("F j, Y, g:i a");                 // March 10, 2001, 5:16 pm
	$today = date("m.d.y");                         // 03.10.01
	$today = date("j, n, Y");                       // 10, 3, 2001
	$today = date("Ymd");                           // 20010310
	$today = date('h-i-s, j-m-y, it is w Day');     // 05-16-18, 10-03-01, 1631 1618 6 Satpm01
	$today = date('it is the jS day.');   // it is the 10th day.
	$today = date("D M j G:i:s T Y");               // Sat Mar 10 17:16:18 MST 2001
	$today = date('H:m:s m is month');     // 17:03:18 m is month
	$today = date("H:i:s");                         // 17:16:18
	$today = date("Y-m-d H:i:s");                   // 2001-03-10 17:16:18 (the MySQL DATETIME format)

	$today = date_format( new DateTime(), 'Y-m-dTH:i:s');

	echo $date = date("c", strtotime("monday this week"));

	$date = strtotime("next sunday");
?>
<?php
	//Things to be aware of when using week numbers with years.
	echo date("YW", strtotime("2022-01-07")); // gives 202201
	echo date("YW", strtotime("2022-12-31")); // gives 202252
	echo date("YW", strtotime("2022-01-01")); // gives 202252 too
?>

BUT

<?php
	echo date("oW", strtotime("2022-01-07")); // gives 202201
	echo date("oW", strtotime("2022-12-31")); // gives 202252
	echo date("oW", strtotime("2022-01-01")); // gives 202152 (Year is different than previous example)
?>

Reason:
	Y is year from the date
	o is ISO-8601 year number
	W is ISO-8601 week number of year

Conclusion:
	if using 'W' for the week number use 'o' for the year.
The following characters are recognized in the format parameter string
The following characters are recognized in the format parameter string
format character Description Example returned values
Day
d Day of the month, 2 digits with leading zeros 01 to 31
D A textual representation of a day, three letters Mon through Sun
j Day of the month without leading zeros 1 to 31
l (lowercase ‘L’) A full textual representation of the day of the week Sunday through Saturday
N ISO 8601 numeric representation of the day of the week 1 (for Monday) through 7 (for Sunday)
S English ordinal suffix for the day of the month, 2 characters st, nd, rd or th. Works well with j
w Numeric representation of the day of the week 0 (for Sunday) through 6 (for Saturday)
z The day of the year (starting from 0) 0 through 365
Week
W ISO 8601 week number of year, weeks starting on Monday Example: 42 (the 42nd week in the year)
Month
F A full textual representation of a month, such as January or March January through December
m Numeric representation of a month, with leading zeros 01 through 12
M A short textual representation of a month, three letters Jan through Dec
n Numeric representation of a month, without leading zeros 1 through 12
t Number of days in the given month 28 through 31
Year
L Whether it’s a leap year 1 if it is a leap year, 0 otherwise.
o ISO 8601 week-numbering year. This has the same value as Y, except that if the ISO week number (W) belongs to the previous or next year, that year is used instead. Examples: 1999 or 2003
Y A full numeric representation of a year, 4 digits Examples: 1999 or 2003
y A two digit representation of a year Examples: 99 or 03
Time
a Lowercase Ante meridiem and Post meridiem am or pm
A Uppercase Ante meridiem and Post meridiem AM or PM
B Swatch Internet time 000 through 999
g 12-hour format of an hour without leading zeros 1 through 12
G 24-hour format of an hour without leading zeros 0 through 23
h 12-hour format of an hour with leading zeros 01 through 12
H 24-hour format of an hour with leading zeros 00 through 23
i Minutes with leading zeros 00 to 59
s Seconds with leading zeros 00 through 59
u Microseconds. Note that date() will always generate 000000 since it takes an int parameter, whereas DateTime::format() does support microseconds if DateTime was created with microseconds. Example: 654321
v Milliseconds. Same note applies as for u. Example: 654
Timezone
e Timezone identifier Examples: UTC, GMT, Atlantic/Azores
I (capital i) Whether or not the date is in daylight saving time 1 if Daylight Saving Time, 0 otherwise.
O Difference to Greenwich time (GMT) without colon between hours and minutes Example: +0200
P Difference to Greenwich time (GMT) with colon between hours and minutes Example: +02:00
p The same as P, but returns Z instead of +00:00 (available as of PHP 8.0.0) Example: +02:00
T Timezone abbreviation, if known; otherwise the GMT offset. Examples: EST, MDT, +05
Z Timezone offset in seconds. The offset for timezones west of UTC is always negative, and for those east of UTC is always positive. -43200 through 50400
Full Date/Time
c ISO 8601 date 2004-02-12T15:19:21+00:00
r » RFC 2822 formatted date Example: Thu, 21 Dec 2000 16:01:07 +0200
U Seconds since the Unix Epoch (January 1 1970 00:00:00 GMT) See also time()

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