Apr 4, 2027, 12:00 midnight
| End DST: | Saturday, March 10, 1973 — 1 hour backward |
|---|---|
| Start DST: | Sunday, September 30, 1973 — 1 hour forward |
Mar 11
Back 1 hour
Mar 11, 1973 - Daylight Saving Time Ended
When local daylight time was about to reach
Sunday, March 11, 1973, 12:00:00 midnight clocks were turned backward 1 hour to
Saturday, March 10, 1973, 11:00:00 pm local standard time instead.
Sunrise and sunset were about 1 hour earlier on Mar 11, 1973 than the day before. There was more light in the morning and less light in the evening.
Also called Fall Back and Winter Time.
Sep 30
Forward 1 hour
Sep 30, 1973 - Daylight Saving Time Started
When local standard time was about to reach
Sunday, September 30, 1973, 12:00:00 midnight clocks were turned forward 1 hour to
Sunday, September 30, 1973, 1:00:00 am local daylight time instead.
Sunrise and sunset were about 1 hour later on Sep 30, 1973 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 End (Clock Backward) | DST Start (Clock Forward) |
|---|---|---|
| 1970 | Sunday, March 29, 12:00 midnight | Sunday, October 11, 12:00 midnight |
| 1971 | Sunday, March 14, 12:00 midnight | Sunday, October 10, 12:00 midnight |
| 1972 | Sunday, March 12, 12:00 midnight | Sunday, October 15, 12:00 midnight |
| 1973 | Sunday, March 11, 12:00 midnight | Sunday, September 30, 12:00 midnight |
| 1974 | Sunday, March 10, 12:00 midnight | Sunday, October 13, 12:00 midnight |
| 1975 | Sunday, March 9, 12:00 midnight | Sunday, October 12, 12:00 midnight |
| 1976 | Sunday, March 14, 12:00 midnight | Sunday, October 10, 12:00 midnight |
| 1977 | Sunday, March 13, 12:00 midnight | Sunday, October 9, 12:00 midnight |
| 1978 | Sunday, March 12, 12:00 midnight | Sunday, October 15, 12:00 midnight |
| 1979 | Sunday, March 11, 12:00 midnight | Sunday, October 14, 12:00 midnight |
| All times are local for 27°46'02.5"S, 69°07'56.0"W. | ||
Data for the years before 1970 is not available for 27°46'02.5"S, 69°07'56.0"W, however, we have earlier time zone history for Santiago available.
Detailed time zone and clock changes in 27°46'02.5"S, 69°07'56.0"W