Effects of time adjusted backward - Security Center 5.9

Security Center User Guide 5.9

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Security Center 5.9
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2020-08-19
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When time is adjusted backward, it changes from Daylight Saving Time (DST) to Eastern Standard Time (EST).

The timeshift from DST to EST occurs at 2:00 am. Before 2:00 am, Security Center uses the DST (UTC-4). Starting from 2:00 am, it uses the EST (UTC-5), as shown in the following table:
  DST Time change EST
Local time 12:00 am 1:00 am 2:00 am = 1:00 am 2:00 am 3:00 am
Offset (hours) -4 -4 -5 -5 -5
UTC 4:00 am 5:00 am 6:00 am 7:00 am 8:00 am
Because the time was adjusted backward, the following behaviors can be observed when playing back video or exporting archives:
  • The time shifts back by one hour in the timeline. After 1:59:59 am, the displayed time falls back to 1:00:00 am.
  • The end time of a video sequence can be earlier than the start time.
  • Exporting archives between 1:00 am and 2:00 am always includes an additional hour of video. For example, when exporting archives from 1:50 am - 2:00 am on the night of a timeshift, the exported sequence includes 1 hour and 10 minutes of video because the query includes video from 5:50 am - 7:00 am UTC.
To prevent the time from shifting back by one hour during video playback, or to export video without an extra hour of footage, you must configure Security Desk to use UTC. After exporting the sequence, you can revert to the previously configured time zone to view the sequence relative to your local time reference.