-D/path/to/file

[Rich Salz]

How about changing Make_Date to be like this?

char *
Make_Date (rawdate)
    char *rawdate;
{
    time_t unixtime;

!   if (*rawdate == '/') {
!       struct stat sb;
!       unixtime = stat(rawdate, &sb) < 0 ? 0 : sb.st_mtime;
!   }
!   else
!       unixtime = get_date (rawdate, (struct timeb *) NULL);
    if (unixtime == (time_t) - 1)
        error (1, 0, "Can't parse date/time: %s", rawdate);
    return date_from_time_t (unixtime);
}

Then you could use the filesystem to keep timestamps...