Epson 20 - Manual (Page 42)

If you enter an invalid time-for example, a number greater than
23 for the hours or greater than 59 for the minutes or seconds-
the computer beeps and ignores your entry. Try again.
When the time is correct, press Enter.
4. To set the date, highlight Date and press Enter. You see this
box:
5. Enter the date in the exact format shown in the box, using two
digits for the month and day and four digits for the year; the
program automatically inserts the dashes. For example, to set the
date for April 30, 1989, you would type the following:
04301989
If you enter an invalid date-for example, a number greater than
12 for the month or greater than the number of days in that
month-the computer beeps and ignores your entry. Try again.
When the date is correct, press Enter.
6. When both the time and date are correct, press once or twice
to return to the main Setup menu.
2-12 Running the Setup Program