timestamp.f90 Source File

subroutine timestamp ( )
  
    !*****************************************************************************80
    !
    !! TIMESTAMP prints the current YMDHMS date as a time stamp.
    !
    !  Example:
    !
    !    31 May 2001   9:45:54.872 AM
    !
    !  Licensing:
    !
    !    This code is distributed under the GNU LGPL license.
    !
    !  Modified:
    !
    !    18 May 2013
    !
    !  Author:
    !
    !    John Burkardt
    !
    !  Parameters:
    !
    !    None
    !
      implicit none
    
      character ( len = 8 ) ampm
      integer ( kind = 4 ) d
      integer ( kind = 4 ) h
      integer ( kind = 4 ) m
      integer ( kind = 4 ) mm
      character ( len = 9 ), parameter, dimension(12) :: month = (/ &
        'January  ', 'February ', 'March    ', 'April    ', &
        'May      ', 'June     ', 'July     ', 'August   ', &
        'September', 'October  ', 'November ', 'December ' /)
      integer ( kind = 4 ) n
      integer ( kind = 4 ) s
      integer ( kind = 4 ) values(8)
      integer ( kind = 4 ) y
    
      call date_and_time ( values = values )
    
      y = values(1)
      m = values(2)
      d = values(3)
      h = values(5)
      n = values(6)
      s = values(7)
      mm = values(8)
    
      if ( h < 12 ) then
        ampm = 'AM'
      else if ( h == 12 ) then
        if ( n == 0 .and. s == 0 ) then
          ampm = 'Noon'
        else
          ampm = 'PM'
        end if
      else
        h = h - 12
        if ( h < 12 ) then
          ampm = 'PM'
        else if ( h == 12 ) then
          if ( n == 0 .and. s == 0 ) then
            ampm = 'Midnight'
          else
            ampm = 'AM'
          end if
        end if
      end if
    
      write ( *, '(i2,1x,a,1x,i4,2x,i2,a1,i2.2,a1,i2.2,a1,i3.3,1x,a)' ) &
        d, trim ( month(m) ), y, h, ':', n, ':', s, '.', mm, trim ( ampm )
    
      return
end