Last change: 2022
Oct
30
1 hour Back
Oct 30, 2022, 2:00 am
| Start DST: | Monday, December 9, 1940 — 1 hour forward |
|---|
Dec 9
Forward 1 hour
Dec 9, 1940 - Daylight Saving Time Started
When local standard time was about to reach
Monday, December 9, 1940, 12:00:00 midnight clocks were turned forward 1 hour to
Monday, December 9, 1940, 1:00:00 am local daylight time instead.
Sunrise and sunset were about 1 hour later on Dec 9, 1940 than the day before. There was more light in the evening and less light in the morning.
Also called Spring Forward, Summer Time, and Daylight Savings Time.
Daylight Saving Time in Other Years
DST changes do not necessarily occur on the same date every year.
| Year | DST Start (Clock Forward) | DST End (Clock Backward) |
|---|---|---|
| 1925 — 1930 | DST not observed | |
| 1931 | Friday, May 1, 11:00 pm | Thursday, October 1, 12:00 midnight |
| 1932 — 1938 | DST not observed | |
| 1939 | Sunday, February 5, 12:00 midnight | Sunday, June 25, 12:00 midnight |
| 1940 | Monday, December 9, 12:00 midnight | No DST End |
| 1941 | No DST Start | Tuesday, April 1, 12:00 midnight |
| 1942 | DST not observed | |
| 1943 | Thursday, December 16, 12:00 midnight | No DST End |
| 1944 | No DST Start | Monday, May 1, 12:00 midnight |
| 1945 — 1949 | DST not observed | |
| All times are local for Mexico City. | ||