Prevent NPE on log line. Use monotonically increasing time for alarm …

[linster]

…manager scheduling calculations.

https://developer.android.com/training/scheduling/alarms
"There are two general clock types for alarms: "elapsed real time" and "real time clock" (RTC). Elapsed real time uses the "time since system boot" as a reference, and real time clock uses UTC (wall clock) time. This means that elapsed real time is suited to setting an alarm based on the passage of time (for example, an alarm that fires every 30 seconds) since it isn't affected by time zone/locale. The real time clock type is better suited for alarms that are dependent on current locale."

https://stackoverflow.com/a/15400014

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