21 Oct 1979, 03:30
| Start DST: | Sunday, 22 April 1973 — 1 hour forward |
|---|---|
| End DST: | Sunday, 21 October 1973 — 1 hour backward |
22 Apr
Forward 1 hour
22 Apr 1973 - Daylight Saving Time Started
When local standard time was about to reach
Sunday, 22 April 1973, 03:30:00 clocks were turned forward 1 hour to
Sunday, 22 April 1973, 04:30:00 local daylight time instead.
Sunrise and sunset were about 1 hour later on 22 Apr 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.
21 Oct
Back 1 hour
21 Oct 1973 - Daylight Saving Time Ended
When local daylight time was about to reach
Sunday, 21 October 1973, 03:30:00 clocks were turned backward 1 hour to
Sunday, 21 October 1973, 02:30:00 local standard time instead.
Sunrise and sunset were about 1 hour earlier on 21 Oct 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.
30 Dec
Forward 1 hour
30 Dec 1973 - Daylight Saving Time Started
When local standard time was about to reach
Sunday, 30 December 1973, 03:30:00 clocks were turned forward 1 hour to
Sunday, 30 December 1973, 04:30:00 local daylight time instead.
Sunrise and sunset were about 1 hour later on 30 Dec 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 Start (Clock Forward) | DST End (Clock Backward) |
|---|---|---|
| 1970 | Sunday, 19 April, 03:30 | Sunday, 18 October, 03:30 |
| 1971 | Sunday, 18 April, 03:30 | Sunday, 17 October, 03:30 |
| 1972 | Sunday, 16 April, 03:30 | Sunday, 22 October, 03:30 |
| * 1973 | Sunday, 22 April, 03:30 | Sunday, 21 October, 03:30 |
| 1974 | No DST Start | Sunday, 20 October, 03:30 |
| 1975 | Sunday, 20 April, 03:30 | Sunday, 19 October, 03:30 |
| 1976 | Sunday, 18 April, 03:30 | Sunday, 17 October, 03:30 |
| 1977 — 1978 | DST not observed | |
| 1979 | Sunday, 13 May, 03:30 | Sunday, 21 October, 03:30 |
| All times are local for Hong Kong. * All or part of this period was on double DST. | ||