This is a list of PHP date() style date/time formats that the "Date and Time Converter" class currently supports and also formats that I plan on implementing in the near future. This table was copied from the PHP manual and modified. php.net/date

Currently Supported Date/Time Formats

format character | Description | Example returned values
--- | --- | ---
Day | --- | ---
d | Day of the month, 2 digits with leading zeros | 01 to 31
j | Day of the month without leading zeros | 1 to 31
S | English ordinal suffix for the day of the month, 2 characters | st, nd, rd or th. Works well with j
D | A textual representation of a day, three letters | Mon through Sun
Month | --- | ---
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
Year | --- | ---
o | ISO-8601 year number. 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. (added in PHP 5.1.0) | 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
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

Date/Time Formats Coming Soon!

format character | Description | Example returned values
--- | --- | ---
u | Milliseconds (added in PHP 5.2.2) | Example: 54321
O | Difference to Greenwich time (GMT) in hours | Example: +0200
P | Difference to Greenwich time (GMT) with colon between hours and minutes (added in PHP 5.1.3) | Example: +02:00
c | ISO 8601 date (added in PHP 5) | 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()
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 (added in PHP 5.1.0) | 1 (for Monday) through 7 (for Sunday)
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
W | ISO-8601 week number of year, weeks starting on Monday (added in PHP 4.1.0) | Example: 42 (the 42nd week in the year)
F | A full textual representation of a month, such as January or March | January through December
t | Number of days in the given month | 28 through 31