PHP Date Cheat Sheet

d	Day of the month, 2 digits with leading zeros	01 - 31
D	A textual representation of a day, three letters	Mon - Sun
j	Day of the month without leading zeros	1 - 31
l (lowercase L)	A full textual representation of the day of the week	Sunday - Saturday
N	ISO-8601 numeric representation of the day of the week (added in PHP 5.1.0)	1 (for Monday) - 7 (for Sunday)
w	Numeric representation of the day of the week	0 (for Sunday) - 6 (for Saturday)
z	The day of the year (starting from 0)	0 - 365

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 - 999
g	12-hour format of an hour without leading zeros	1 - 12
G	24-hour format of an hour without leading zeros	0 - 23
h	12-hour format of an hour with leading zeros	01 - 12
H	24-hour format of an hour with leading zeros	00 - 23
i	Minutes with leading zeros	00 - 59
s	Seconds, with leading zeros	00 - 59

mktime(hours, minutes, seconds, month, day, year);

F	A full textual representation of a month, such as January or March	January - December
m	Numeric representation of a month, with leading zeros	01 - 12
M	A short textual representation of a month, three letters	Jan - Dec
n	Numeric representation of a month, without leading zeros	1-12
t	Number of days in the given month	28 - 31

ISO-8601 week number of year, weeks starting on Monday

Example: 42 (the 42nd week in the year)

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) in hours	Example: +0200
P	Difference to Greenwich time (GMT) with colon between hours and minutes	Example: +02:00
T	Timezone abbreviation	Examples: EST, MDT
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 to 50400

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PHP Date Cheat Sheet by unclepips