coreutils: date invocation

 
 21.1 ‘date’: Print or set system date and time
 ==============================================
 
 Synopses:
 
      date [OPTION]... [+FORMAT]
      date [-u|--utc|--universal] [ MMDDhhmm[[CC]YY][.ss] ]
 
    The ‘date’ command displays the date and time.  With the ‘--set’
 (‘-s’) option, or with ‘MMDDhhmm[[CC]YY][.ss]’, it sets the date and
 time.
 
    Invoking ‘date’ with no FORMAT argument is equivalent to invoking it
 with a default format that depends on the ‘LC_TIME’ locale category.  In
 the default C locale, this format is ‘'+%a %b %e %H:%M:%S %Z %Y'’, so
 the output looks like ‘Thu Jul  9 17:00:00 EDT 2020’.
 
    Normally, ‘date’ uses the time zone rules indicated by the ‘TZ’
 environment variable, or the system default rules if ‘TZ’ is not set.
 ⇒Specifying the Time Zone with ‘TZ’ (libc)TZ Variable.
 
    An exit status of zero indicates success, and a nonzero value
 indicates failure.
 

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