| Current: | AST — Atlantic Standard Time |
|---|---|
| Next Change: | ADT — Atlantic Daylight Time |
| Current Offset: | UTC/GMT -4 hours |
| Difference: | 1 hour ahead of Columbus |
2025 Time Zones - Mount Sir Donald
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
The graph above illustrates clock changes in Mount Sir Donald during 2025.
Time Changes in Mount Sir Donald Over the Years
Daylight Saving Time (DST) changes do not necessarily occur on the same date every year.
| Year | Date & Time | Abbreviation | Time Change | Offset After |
|---|---|---|---|---|
| 2024 | Sun, Mar 10 at 2:00 am | AST → ADT | +1 hour (DST start) | UTC-3h |
| Sun, Nov 3 at 2:00 am | ADT → AST | -1 hour (DST end) | UTC-4h | |
| 2025 | Sun, Mar 9 at 2:00 am | AST → ADT | +1 hour (DST start) | UTC-3h |
| Sun, Nov 2 at 2:00 am | ADT → AST | -1 hour (DST end) | UTC-4h | |
| 2026 | Sun, Mar 8 at 2:00 am | AST → ADT | +1 hour (DST start) | UTC-3h |
| Sun, Nov 1 at 2:00 am | ADT → AST | -1 hour (DST end) | UTC-4h | |
| 2027 | Sun, Mar 14 at 2:00 am | AST → ADT | +1 hour (DST start) | UTC-3h |
| Sun, Nov 7 at 2:00 am | ADT → AST | -1 hour (DST end) | UTC-4h | |
| 2028 | Sun, Mar 12 at 2:00 am | AST → ADT | +1 hour (DST start) | UTC-3h |
| Sun, Nov 5 at 2:00 am | ADT → AST | -1 hour (DST end) | UTC-4h | |
| * All times are local Mount Sir Donald time. Next time change is highlighted. | ||||
Data for the years before 1970 is not available for Mount Sir Donald, however, we have earlier time zone history for Happy Valley-Goose Bay available.
More Information
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Mount Sir Donald
Canada
9:0131am
Friday, December 5, 2025