Los Angeles time zone history
Standard time has stayed at UTC−8 since 1883, tied second-longest run among the 148 zones with no change of standard time since 1970. On standard time, clocks in Los Angeles run 7 minutes behind local mean solar time.
UTC−8
Standard time is UTC−8 (PDT/PST); clocks go forward to UTC−7 on the second Sunday in March and back on the first Sunday in November.
Summer time in every year since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| November 18, 1883 | Local mean time (UTC−7:52:58) replaced | UTC−8 | PST |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| 1918–1919 | last Sunday in March, 02:00 | last Sunday in October, 02:00 | 1 hour, PST to PDT |
| 1942 | February 9 | not that year | 1 hour, PST to PWT |
| 1945 | not that year | September 30 | 1 hour |
| 1948 | March 14 | not that year | 1 hour, PST to PDT |
| 1949 | not that year | January 1 | 1 hour, PST to PDT |
| 1950–1961 | last Sunday in April, 01:00 | last Sunday in September, 02:00 | 1 hour, PST to PDT |
| 1962–1973 | last Sunday in April, 01:00 | last Sunday in October, 02:00 | 1 hour, PST to PDT |
Since 1970: the periods shared by 5 of 29 zones, listed on the United States page.
Clock changes in 2026, 2027 and 2028
The clocks go forward 1 hour (PST to PDT) on March 8, 2026, March 14, 2027 and March 12, 2028 at 02:00 and back 1 hour (PDT to PST) on November 1, 2026, November 7, 2027 and November 5, 2028 at 02:00, local time.
Also on UTC−8
Clocks next door since 1970
- Tijuana (Mexico) (204 km): same time except 98 days in 2007–2009.
- Phoenix (574 km): same time except 8,613 days in 1970–2026; 1 hour ahead today.
- Hermosillo (Mexico) (884 km): same time except 9,222 days in 1970–2026; 1 hour ahead today.
- Boise (1,078 km): usually 1 hour ahead; different on 33 days in 1970–2026.
- Ciudad Juárez (Mexico) (1,127 km): usually 1 hour ahead; different on 5,336 days in 1970–2026.