MST

Time zone identifier: MST

Current civil offset: -07:00 (MST)

Current DST state: Observing Standard Time

First standard time adoption: Adopted on 1883-11-18

Local Mean Time (LMT): -07:28:18 based on geographic meridian

Total recorded transitions: 11 transitions across 3 distinct offsets

Historical Offset Step Chart (1880 to Present)

Text summary: MST shifted between 3 distinct offsets from 1883-11-18 through the modern era.

UTC Instant	Local Wall Time	Shift	Abbreviation	DST	Effect
`1883-11-18T19:00:00Z`	`1883-11-18 12:00:00`	-07:28:18 → -07:00	`MST`	No	gap
`1918-03-31T09:00:00Z`	`1918-03-31 03:00:00`	-07:00 → -06:00	`MDT`	Yes	gap
`1918-10-27T08:00:00Z`	`1918-10-27 01:00:00`	-06:00 → -07:00	`MST`	No	overlap
`1919-03-30T09:00:00Z`	`1919-03-30 03:00:00`	-07:00 → -06:00	`MDT`	Yes	gap
`1919-10-26T08:00:00Z`	`1919-10-26 01:00:00`	-06:00 → -07:00	`MST`	No	overlap
`1942-02-09T09:00:00Z`	`1942-02-09 03:00:00`	-07:00 → -06:00	`MWT`	Yes	gap
`1944-01-01T06:01:00Z`	`1943-12-31 23:01:00`	-06:00 → -07:00	`MST`	No	overlap
`1944-04-01T07:01:00Z`	`1944-04-01 01:01:00`	-07:00 → -06:00	`MWT`	Yes	gap
`1944-10-01T06:01:00Z`	`1944-09-30 23:01:00`	-06:00 → -07:00	`MST`	No	overlap
`1967-04-30T09:00:00Z`	`1967-04-30 03:00:00`	-07:00 → -06:00	`MDT`	Yes	gap
`1967-10-29T08:00:00Z`	`1967-10-29 01:00:00`	-06:00 → -07:00	`MST`	No	overlap

tzdb guarantees accuracy for timestamps from 1970 onwards. Transitions prior to 1970 represent best-effort historical reconstructions.