(coreutils.info)Setting the time

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21.1.5 Setting the time
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If given an argument that does not start with ‘+’, ‘date’ sets the
system clock to the date and time specified by that argument (as
described below).  You must have appropriate privileges to set the
system clock.  Note for changes to persist across a reboot, the hardware
clock may need to be updated from the system clock, which might not
happen automatically on your system.

   The argument must consist entirely of digits, which have the
following meaning:

‘MM’
     month
‘DD’
     day within month
‘hh’
     hour
‘mm’
     minute
‘CC’
     first two digits of year (optional)
‘YY’
     last two digits of year (optional)
‘ss’
     second (optional)

   Note, the ‘--date’ and ‘--set’ options may not be used with an
argument in the above format.  The ‘--universal’ option may be used with
such an argument to indicate that the specified date and time are
relative to Universal Time rather than to the local time zone.