Alarms or events become active

For alarms or events, if an attribute has no timestamp, the current AppEngine scan time is used instead. If an attribute has a timestamp, the timestamp of the value that caused the alarm to occur is used as the value for the object’s AlarmOnTime attribute.

When an alarm is silenced or disabled, and an alarm condition becomes TRUE, when the alarm is later enabled, the timestamp for AlarmOnTime is the timestamp of the most recent attribute change, not the time at which the alarm was enabled.

For an event, if an attribute has a timestamp, the timestamp of the value that caused the event to be reported is used for the EventTime. A System Event timestamp is the current system time.