To set calendar.12/24 timer and time
1. press and hold set for 2 seconds.time digits change to year "2008yr" and flash press+/- to set year.
2. then press set/alm set once agin.date digits flash press +/- button to set date.
3. then press set/alm set once agin.date digits flash press +/- button to set month
4. press set/alm set once again time digits change "24" hr press+/-to select "12hr" time format or24"hr"timer format. when "12hr" is selected, am/pm icon will be displayed.