To set clock time:
a) dial *5
b) dial time (2-digit hour plus 2-digit minutes)
c) dial * for p.m., otherwise a.m.
d) press release

To change the date:
a) dial *15 and 3- or 4-digit date (1- or 2-digit month, 2-digit day)
b) press release

If possible, you might want to get a database printout.
a) dial *190
b) press release

Hope this helps