Use the XDATE command to supply a time stamp
for the file being sent.
The XDATE statement should come after a
FILE command and should preceed any DATA commands.
The syntax is
XDATE | seconds |
where
seconds | is the age of the file in seconds since the epoch |
The XDATE command represents the time and date
as a single integral value,
the number of seconds since
the epoch, January 1, 1970.