You can set an alarm to sound at a desired time.
Set the alarm
Select Menu > Applications > Alarm clock.
Set the alarm, and enter the alarm time.
To issue an alarm on selected days of the week, select Repeat: > On and the days.
Select the alarm tone. If you select the radio as the alarm tone, connect the headset to the device.
Set the length of the snooze time-out period, and select Save.
Stop the alarm
Select Stop. If you let the alarm sound for a minute or select Snooze, the alarm stops for the length of the snooze time-out period, then resumes.