(PHP 3 = 3.0.12, PHP 4 )
The function expects to be given a string containing an
English date format and will try to parse that format into a
UNIX timestamp relative to the timestamp given in now, or the current time if none is
supplied. Upon failure, -1 is
returned.
Because strtotime() behaves
according to GNU date syntax, have a look at the GNU manual
page titled Date Input Formats. Described there is
valid syntax for the time
parameter.
注: The valid range of a timestamp is typically from Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT. (These are the dates that correspond to the minimum and maximum values for a 32-bit signed integer.)