grub: date

 
 16.3.21 date
 ------------
 
  -- Command: date [[year-]month-day] [hour:minute[:second]]
      With no arguments, print the current date and time.
 
      Otherwise, take the current date and time, change any elements
      specified as arguments, and set the result as the new date and
      time.  For example, 'date 01-01' will set the current month and day
      to January 1, but leave the year, hour, minute, and second
      unchanged.