Sep 22, 2022, 12:00 midnight
Start DST: | Tuesday, March 21, 1978 — 1 hour forward |
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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 and less light in the morning.
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 and less light in the evening.
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) |
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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 Tehran. |