(PHP 4, PHP 5, PHP 7, PHP 8)
mktime — Get Unix timestamp for a date
$hour,$minute = null,$second = null,$month = null,$day = null,$year = nullReturns the Unix timestamp corresponding to the arguments given. This timestamp is a long integer containing the number of seconds between the Unix Epoch (January 1 1970 00:00:00 GMT) and the time specified.
Any optional
arguments omitted or null will be set to the current value according
to the local date and time.
Please note that the ordering of arguments is in an odd order:
month, day,
year, and not in the more reasonable order of
year, month,
day.
Calling mktime() without arguments is not supported, and will result in an ArgumentCountError. time() can be used to get the current timestamp.
hour
The number of the hour relative to the start of the day determined by
month, day and year.
Negative values reference the hour before midnight of the day in question.
Values greater than 23 reference the appropriate hour in the following day(s).
minute
The number of the minute relative to the start of the hour.
Negative values reference the minute in the previous hour.
Values greater than 59 reference the appropriate minute in the following hour(s).
second
The number of seconds relative to the start of the minute.
Negative values reference the second in the previous minute.
Values greater than 59 reference the appropriate second in the following minute(s).
monthThe number of the month relative to the end of the previous year. Values 1 to 12 reference the normal calendar months of the year in question. Values less than 1 (including negative values) reference the months in the previous year in reverse order, so 0 is December, -1 is November, etc. Values greater than 12 reference the appropriate month in the following year(s).
dayThe number of the day relative to the end of the previous month. Values 1 to 28, 29, 30 or 31 (depending upon the month) reference the normal days in the relevant month. Values less than 1 (including negative values) reference the days in the previous month, so 0 is the last day of the previous month, -1 is the day before that, etc. Values greater than the number of days in the relevant month reference the appropriate day in the following month(s).
year
The number of the year, may be a two or four digit value,
with values between 0-69 mapping to 2000-2069 and 70-100 to
1970-2000. On systems where time_t is a 32bit signed integer, as
most common today, the valid range for year
is somewhere between 1901 and 2038.
mktime() returns the Unix timestamp of the arguments
given, or false if the timestamp doesn't fit in a PHP integer.
| Version | Description |
|---|---|
| 8.0.0 |
hour is no longer optional. If you need a Unix
timestamp, use time().
|
| 8.0.0 |
minute, second, month,
day and year are nullable now.
|
Example #1 mktime() basic example
<?php
// Set the default timezone to use.
date_default_timezone_set('UTC');
// Prints: July 1, 2000 is on a Saturday
echo "July 1, 2000 is on a " . date("l", mktime(0, 0, 0, 7, 1, 2000));
// Prints something like: 2006-04-05T01:02:03+00:00
echo date('c', mktime(1, 2, 3, 4, 5, 2006));
?>
Example #2 mktime() example
mktime() is useful for doing date arithmetic and validation, as it will automatically calculate the correct value for out-of-range input. For example, each of the following lines produces the string "Jan-01-1998".
<?php
echo date("M-d-Y", mktime(0, 0, 0, 12, 32, 1997));
echo date("M-d-Y", mktime(0, 0, 0, 13, 1, 1997));
echo date("M-d-Y", mktime(0, 0, 0, 1, 1, 1998));
echo date("M-d-Y", mktime(0, 0, 0, 1, 1, 98));
?>
Example #3 Last day of a month
The last day of any given month can be expressed as the "0" day of the next month, not the -1 day. Both of the following examples will produce the string "The last day in Feb 2000 is: 29".
<?php
$lastday = mktime(0, 0, 0, 3, 0, 2000);
echo 'Last day in Feb 2000 is: ', date('d', $lastday);
$lastday = mktime(0, 0, 0, 4, -31, 2000);
echo 'Last day in Feb 2000 is: ', date('d', $lastday);
?>