|  | Print the date, in the format The options are|  |  |  | Tue Aug 16 17:03:52 CDT 1977 | 
 −u    Report Greenwich Mean Time (GMT) rather than local time.
 −n    Report the date as the number of seconds since the epoch, 00:00:00
    GMT, January 1, 1970. 
    
    
    The conversion from Greenwich Mean Time to local time depends
    on the $timezone environment variable; see ctime(3). 
    
    
    If the optional argument seconds is present, it is used as the
    time to convert rather than the real time.
 
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