The date Function

The date function outputs the date in a specified format. The first parameter of the function is the format, and the second optional parameter is a point in time in timestamp format. If the second parameter is not specified, the current time is taken; if specified, the given time is used.

The format is specified using control commands (English letters), and any separators can be inserted between them (hyphens, colons, and so on).

The function accepts the following commands (uppercase letters differ from lowercase ones, pay attention):

U – the number of seconds elapsed since 1 January 1970 (i.e., timestamp).
z – the day number from the start of the year.
Y – year, 4 digits.
y - year, two digits.
m – month number (with leading zero).
n – month number without a leading zero.
d – day of the month, always two digits (the first can be zero).
j – day of the month without a leading zero.
w – day of the week (0 - Sunday, 1 - Monday, etc.).
h – hours in 12- hour format.
H – hours in 24- hour format.
i – minutes.
s – seconds.
L – 1 if it's a leap year, 0 if not.
W – the sequential number of the week of the year.
t – the number of days in the specified month.

Syntax

date(string $format, ?int $timestamp = null): string

Examples of Using date

<?php
	// All examples are shown for the date 01.06.2013 at 12.23.59, Monday
	
	echo date('Y'); // outputs '2013'
	echo date('y'); // outputs '13'
	echo date('m'); // outputs '06' - month number
	echo date('d'); // outputs '01' - day of the month
	echo date('j'); // outputs '1'  - day of the month (without leading zero)
	echo date('w'); // outputs '1'  - Monday
	echo date('H'); // outputs '12' - hours
	echo date('i'); // outputs '23' - minutes
	echo date('s'); // outputs '59' - seconds
	
	echo date('d-m-Y'); // outputs '01-06-2013'
	echo date('d.m.Y'); // outputs '01.06.2013'
	echo date('H:i:s d.m.Y'); // outputs '12:23:59 01.06.2013'
?>

The Second Parameter of the date Function

The date function has a second optional parameter, which accepts a point in time in timestamp format. If you pass this parameter, the date function will format not the current time, but the one passed as the second parameter. This timestamp can be obtained, for example, via mktime (but not necessarily):

<?php
	echo date('d-m-Y', mktime(0, 0, 0, 12, 29, 13)); // outputs '29-12-2013'
?>

This can be used to find out the day of the week for a specific date - simply pass it as the second parameter using the mktime function, and use the control character 'w' as the first parameter:

<?php
	// Let's find out what day of the week was 29-12-2013:
	echo date('w', mktime(0, 0, 0, 12, 29, 13)); // outputs '0' - Sunday
?>

The date Function

Syntax

Examples of Using date

The Second Parameter of the date Function

See Also