Sep 22, 2022, 12:00 midnight
| Start DST: | Tuesday, March 21, 1978 — 1 hour forward |
|---|---|
| End DST: | Friday, October 20, 1978 — 1 hour backward |
Mar 21
Forward 1 hour
Mar 21, 1978 - Daylight Saving Time Started
When local standard time was about to reach
Tuesday, March 21, 1978, 12:00:00 midnight clocks were turned forward 1 hour to
Tuesday, March 21, 1978, 1:00:00 am local daylight time instead.
Sunrise and sunset were about 1 hour later on Mar 21, 1978 than the day before. There was more light in the evening.
Also called Spring Forward, Summer Time, and Daylight Savings Time.
Oct 21
Back 1 hour
Oct 21, 1978 - Daylight Saving Time Ended
When local daylight time was about to reach
Saturday, October 21, 1978, 12:00:00 midnight clocks were turned backward 1 hour to
Friday, October 20, 1978, 11:00:00 pm local standard time instead.
Sunrise and sunset were about 1 hour earlier on Oct 21, 1978 than the day before. There was more light in the morning.
Also called Fall Back and Winter Time.
Jan 1
Back 0:30 hours
Jan 1, 1979 - Time Zone Change (IRST → IRST)
When local standard time was about to reach
Monday, January 1, 1979, 12:00:00 midnight clocks were turned backward 0:30 hours to
Sunday, December 31, 1978, 11:30:00 pm local standard time instead.
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) |
|---|---|---|
| 1970 — 1977 | DST not observed | |
| 1978 | Tuesday, March 21, 12:00 midnight | Saturday, October 21, 12:00 midnight |
| 1979 | Wednesday, March 21, 12:00 midnight | Wednesday, September 19, 12:00 midnight |
| All times are local for Karaj. | ||
Data for the years before 1970 is not available for Karaj, however, we have earlier time zone history for Tehran available.