IBM 3270 Manual page 21

14. Type the current time.
For example, 1:34 p.m., would look like this:
Current time is 00:00:00.0
Enter new time: 13:34_
For AM, use the correct time. For PM, add
12 to the hours of the correct time. For
example:
1:34am
11:02arn
1: 34prn
11:02prn
would be
would be
would be
would be
1:34
11:02
13:34
23:02
You don't need to include the seconds and
tenths of seconds.
15. Press the Enter key.
16. Wait for this message to appear followed by
the DOS prompt:
Current date is Tue 1-01-1980
Enter new date: 2-28-1985
Current time is 00:00:00.0
Enter new time: 13:34
The IBM Personal Computer DOS
Version x.xx (C) Copyright IBM Corp. 1981,1982,1983
ft.>
The A> _ is the DOS prompt. DOS is now in
your work station's memory.
1-12 Book 2 - Setting Up and Learning