Example 4 (DATE command)

DATE DAY HOUR 1 24 BY 2. 

• This command creates three variables (DATE_, DAY_, and HOUR_) in a file where observations occur every two hours in a 24-hour day.
• DAY_ uses the default starting value of 1. It has no periodicity, since none is specified, and it is the highest-order keyword on the command.
• HOUR_ starts with a value of 1 and has a periodicity of 24.
• Keyword BY specifies an increment of 2 to use in assigning hour values.

DATE reports the following:

  Name        Label

  DAY_        DAY, not periodic
  HOUR_       HOUR, period 24 by 2
  DATE_       DATE.  FORMAT:  "DDDD HH"

The following is a partial listing of the new variables:

    DAY_ HOUR_ DATE_

       1    1     1  1
       1    3     1  3
       1    5     1  5
     ...
      39   17    39 17
      39   19    39 19
      39   21    39 21
      39   23    39 23
      40    1    40  1
      40    3    40  3
      40    5    40  5
      40    7    40  7
      40    9    40  9
      40   11    40 11