time.delta
time.delta(days, hours, minutes, seconds)
Creates a time delta that can be added to or subtracted from a time represented by an internal datetime object. It accepts keyword parameters, for example:
delay := time.delta(hours := 5, minutes := 15);
now := time.current();
later := now + delay;
now := time.current();
later := now + delay;
Time deltas cannot be stored in the datastore. Attempts to do so will result in a run-time error.
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