Date math

for the purposes of
these calculations, 21 Dec 24

pretty today: Saturday, 21 December 2024 date('l, j F Y', strtotime( 2024-12-21 ))
my preferred format: 21 Dec 24 date('j M y', strtotime( 2024-12-21 ) )
tomorrow: 12/22/2024 date('m/d/Y', strtotime('+1 day', strtotime( 2024-12-21 )))
next week: Saturday, December 28th, 2024 date('l, F jS, Y', strtotime('+1 week', strtotime( 2024-12-21 )))
one month ago: 21 Nov 24 date('j M y', strtotime('-1 month', strtotime( 2024-12-21 )))
complex calculations
first day of next month: 2025-01-01 ( Wednesday, 1 Jan 25 )
my birthday this year: 2024-08-05 ( Monday, August 5th, 2024 )
next year: Tuesday, August 5th, 2025
days to my next birthday: 227 age today: 80.43

also on this page: function to parse dates without hypens, like 230910, into a standard yyyy-mm-dd format

d - The day of the month (from 01 to 31)
D - A textual representation of a day (three letters)
j - The day of the month without leading zeros (1 to 31)
l (lowercase 'L') - A full textual representation of a day
N - The ISO-8601 numeric representation of a day (1 for Monday, 7 for Sunday)
S - The English ordinal suffix for the day of the month (2 characters st, nd, rd or th. Works well with j)
w - A numeric representation of the day (0 for Sunday, 6 for Saturday)
z - The day of the year (from 0 through 365)
W - The ISO-8601 week number of year (weeks starting on Monday)
F - A full textual representation of a month (January through December)
m - A numeric representation of a month (from 01 to 12)
M - A short textual representation of a month (three letters)
n - A numeric representation of a month, without leading zeros (1 to 12)
t - The number of days in the given month
L - Whether it's a leap year (1 if it is a leap year, 0 otherwise)
o - The ISO-8601 year number
Y - A four digit representation of a year
y - A two digit representation of a year
a - Lowercase am or pm
A - Uppercase AM or PM
B - Swatch Internet time (000 to 999)
g - 12-hour format of an hour (1 to 12)
G - 24-hour format of an hour (0 to 23)
h - 12-hour format of an hour (01 to 12)
H - 24-hour format of an hour (00 to 23)
i - Minutes with leading zeros (00 to 59)
s - Seconds, with leading zeros (00 to 59)
u - Microseconds (added in PHP 5.2.2)
e - The timezone identifier (Examples: UTC, GMT, Atlantic/Azores)
I (capital i) - Whether the date is in daylights savings time (1 if Daylight Savings Time, 0 otherwise)
O - Difference to Greenwich time (GMT) in hours (Example: +0100)
P - Difference to Greenwich time (GMT) in hours:minutes (added in PHP 5.1.3)
T - Timezone abbreviations (Examples: EST, MDT)
Z - Timezone offset in seconds. The offset for timezones west of UTC is negative (-43200 to 50400)
c - The ISO-8601 date (e.g. 2013-05-05T16:34:42+00:00)
r - The RFC 2822 formatted date (e.g. Fri, 12 Apr 2013 12:01:05 +0200)
U - The seconds since the Unix Epoch (January 1 1970 00:00:00 GMT)

The above codes are useful in PHP scripts to calculates dates, differences between dates, and date formats

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Date math

using ymd to get pretty dates