With <setdcalarmtime> it is possible to set a — absolute (independent from dive time) — time when the dive computer shall give an alarm.
(see also <setdcdata>)
<setdcalarmtime> <time> <hour>14</hour> <minute>37</minute> </time> <dcalarm> <!-- duration 10 seconds --> <period>10.0</period> <alarmtype>1</alarmtype> </dcalarm> </setdcalarmtime>