There are four styles of Timers described below. As Alarm Clock - Set the ultimate time when the timer should end. Military time is not expected. Alarms of this type may not be repeated. There is only one style of alarms.
Alarms always count to their set time, and continue.
This allows for repeated completion sounds. These settings are available only for timers, not for alarm clocks. Count Up - Timers of this style count up to the entered duration, and stop. This option is only available with timers that are not set as alarm clocks. Count Down - Timers of this style count down to the entered duration, and stop.