Whitehorse time zone history
On standard time, clocks at Whitehorse run 2 hours ahead of local mean solar time, the fourth-largest gap of the 233 zones whose clocks run ahead of the sun. Daylight saving time was used in 41 years since 1970, last in 2020; under the current rules the clocks no longer change. On November 1, 2020 the summer offset, UTC−7, became permanent standard time; the clocks did not move that day.
UTC−7
Standard time is UTC−7 (MST) all year under the current rules.
Summer time in 41 of 57 years since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| August 20, 1900 | Local mean time (UTC−9:00:12) replaced | UTC−9 | YST |
| February 27, 1966 | Standard time forward 1 hour | UTC−8 | PST |
| Since 1970 | |||
| November 1, 2020 | Summer offset kept as standard time; clocks did not move | UTC−7 | MST |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| Before 1970 | |||
| 1918 | April 14 | October 27 | 1 hour, YST to YDT |
| 1919 | May 25 | November 1 | 1 hour, YST to YDT |
| 1942 | February 9 | not that year | 1 hour, YST to YWT |
| 1945 | not that year | September 30 | 1 hour |
| 1965 | April 25 | October 31 | 2 hours, YST to YDDT |
| Since 1970 | |||
| 1980–1986 | last Sunday in April, 02:00 | last Sunday in October, 02:00 | 1 hour, PST to PDT |
| 1987–2006 | first Sunday in April, 02:00 | last Sunday in October, 02:00 | 1 hour, PST to PDT |
| 2007–2019 | second Sunday in March, 02:00 | first Sunday in November, 02:00 | 1 hour, PST to PDT |
| 2020 | March 8 | not that year | 1 hour, PST to PDT |
Also on UTC−7
Dawson (Canada), Fort Nelson (Canada), Dawson Creek (Canada), Vancouver (Canada), Cambridge Bay (Canada), Boise (United States), Denver (United States), Phoenix (United States), Ciudad Juárez (Mexico) and Hermosillo (Mexico) (nearest first; 1 more on the list of offsets).
Clocks next door since 1970
- Juneau (United States) (271 km): usually 1 hour behind; different on 5,695 days in 1970–2026; 2 hours behind today.
- Yakutat (United States) (290 km): usually 1 hour behind; different on 2,843 days in 1970–2026; 2 hours behind today.
- Sitka (United States) (394 km): usually 1 hour behind; different on 5,877 days in 1970–2026; 2 hours behind today.
- Dawson (435 km): same time except 1,396 days in 1970–1973.
- Metlakatla (United States) (654 km): usually 1 hour behind; different on 10,811 days in 1970–2026; 2 hours behind today.