gmtime
gmtime - convert UNIX time into record or string using Greenwich time
gmtime EXPR
Converts a time as returned by the time function to a 9-element array
with the time localized for the standard Greenwich timezone.  
Typically used as follows:
    ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) =
                                            gmtime(time);
All array elements are numeric, and come straight out of a struct tm.
In particular this means that $mon has the range 0..11 and $wday has
the range 0..6.  If EXPR is omitted, does 
gmtime(
time()
)
.