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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.
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
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 1902 and 2037).
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
$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);
