| |
mktime (PHP 3, PHP 4, PHP 5) mktime -- Get Unix timestamp for a date Descriptionint mktime ( [int hour [, int minute [, int second [, int month [, int day [, int year [, int is_dst]]]]]]] )
Returns 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.
Arguments may be left out in order from right to left; any
arguments thus omitted will be set to the current value according
to the local date and time.
Parameters
- hour
The number of the hour.
- minute
The number of the minute.
- second
The number of seconds past the minute.
- month
The number of the month.
- day
The number of the day.
- year
The number of the year, may be a two or four digit value,
with values between 0-69 mapping to 2000-2069 and 70-99 to
1970-1999 (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).
- is_dst
This parameter can be set to 1 if the time is during daylight savings time (DST),
0 if it is not, or -1 (the default) if it is unknown whether the time is within
daylight savings time or not. If it's unknown, PHP tries to figure it out itself.
This can cause unexpected (but not incorrect) results.
Some times are invalid if DST is enabled on the system PHP is running on or
is_dst is set to 1. If DST is enabled in e.g. 2:00, all times
between 2:00 and 3:00 are invalid and mktime() returns an undefined
(usually negative) value.
Some systems (e.g. Solaris 8) enable DST at midnight so time 0:30 of the day when DST
is enabled is evaluated as 23:30 of the previous day.
Return Values
mktime() returns the Unix timestamp of the arguments
given.
If the arguments are invalid (eg. if the year, month and day are all 0), the
function returns -1.
Examples
Example 1. 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 2. Last day of next 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 strftime("Last day in Feb 2000 is: %d", $lastday);
$lastday = mktime(0, 0, 0, 4, -31, 2000);
echo strftime("Last day in Feb 2000 is: %d", $lastday);
?>
|
|
Notes| Caution |
Negative timestamps are not supported under any known version
of Windows. Therefore the range of valid years includes only 1970
through 2038.
|
Copyright © 1997 - 2007 by the PHP Documentation Group. This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later. A copy of the Open Publication License is distributed with this manual, the latest version is presently available at http://www.opencontent.org/openpub/.
Please see full copyright text at http://www.php.net/manual/en/copyright.php
Original version of the above documentation is available at http://www.php.net/manual/en/
|
- Please click on Php And Mysql Divorce Lawyers Portal Website
- Please Also click on our Web developers Showcase
|
