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.