   #PHP Manual Date and Time functions microtime strftime

   PHP Manual
   Prev  Next
   ______________________________________________________________________

                                    mktime

   (PHP 3, PHP 4 )
   mktime -- Get Unix timestamp for a date

Description

   int mktime ( [int hour [, int minute [, int second [, int month [, int
   day [, int year [, int is_dst]]]]]]])

   Warning: Note the strange order of arguments, which differs from the
   order of arguments in a regular Unix mktime() call and which does not
   lend itself well to leaving out parameters from right to left (see
   below). It is a common error to mix these values up in a script.

   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) 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.

   is_dst can be set to 1 if the time is during daylight savings time, 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.

     Note: is_dst was added in 3.0.10.

   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".

   Example 1. mktime() example
   <?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));
   ?>
   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).

     Windows: Negative timestamps are not supported under any known
     version of Windows. Therefore the range of valid years includes
     only 1970 through 2038.

   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".

   Example 2. Last day of next month
   <?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);
   ?>

   Date with year, month and day equal to zero is considered illegal
   (otherwise it what be regarded as 30.11.1999, which would be strange
   behavior).

   See also date() and time().
   ______________________________________________________________________

   Prev      Home     Next
   microtime  Up  strftime
