The .SET DATE and .SET TIME commands let you specify a date and
    time to be inserted in your file when you issue the Substitute
    flag pair, $$, with any of the appropriate date or time
    parameters. .SET DATE also sets the date for the .DATE command,
    which causes the date to appear in running heads.

    Formats

      .SET DATE  d1 ,d2 ,d3

      .SET TIME  t1 ,t2 ,t3

    Abreviated formats

      .SDT  d1 ,d2 ,d3

      .STM  t1 ,t2 ,t3