Historically distinct IANA time zone
America/Swift_Current
- Countries
- Canada
- GPS reference
- 50.28° N, 107.83° W
- Data source
- IANA northamerica
- Aliases
- None
CanadaCST - SK (midwest)
Geographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 50.28° N, 107.83° W. Associated countries: CA.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
War
War
Peace
Peace
Original IANA source file: northamerica.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
Mexico · 2412 km from the reference location · Same annual clock since 2023Civil-time record
Recorded changes over time
From 1905 to 1972 · 23 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- -07:00 · MSTStandard time applies
- -06:00 · MDTDaylight saving time begins
- -07:00 · MSTStandard time applies
- -06:00 · MWTDaylight saving time begins
- -06:00 · MPTDaylight saving time begins
- -07:00 · MSTStandard time applies
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1905-09-01 00:11 | -07:00 | MST | Standard time |
| 1918-04-14 03:00 | -06:00 | MDT | Daylight saving time |
| 1918-10-27 01:00 | -07:00 | MST | Standard time |
| 1942-02-09 03:00 | -06:00 | MWT | Daylight saving time |
| 1945-08-14 17:00 | -06:00 | MPT | Daylight saving time |
| 1945-09-30 01:00 | -07:00 | MST | Standard time |
| 1946-04-28 03:00 | -06:00 | MDT | Daylight saving time |
| 1946-10-13 01:00 | -07:00 | MST | Standard time |
| 1947-04-27 03:00 | -06:00 | MDT | Daylight saving time |
| 1947-09-28 01:00 | -07:00 | MST | Standard time |
| 1948-04-25 03:00 | -06:00 | MDT | Daylight saving time |
| 1948-09-26 01:00 | -07:00 | MST | Standard time |
| 1949-04-24 03:00 | -06:00 | MDT | Daylight saving time |
| 1949-09-25 01:00 | -07:00 | MST | Standard time |
| 1957-04-28 03:00 | -06:00 | MDT | Daylight saving time |
| 1957-10-27 01:00 | -07:00 | MST | Standard time |
| 1959-04-26 03:00 | -06:00 | MDT | Daylight saving time |
| 1959-10-25 01:00 | -07:00 | MST | Standard time |
| 1960-04-24 03:00 | -06:00 | MDT | Daylight saving time |
| 1960-09-25 01:00 | -07:00 | MST | Standard time |
| 1961-04-30 03:00 | -06:00 | MDT | Daylight saving time |
| 1961-09-24 01:00 | -07:00 | MST | Standard time |
| 1972-04-30 03:00 | -06:00 | CST | Standard time |