Mar 29, 2026, 1:00 am
Mar 10
Forward 1 hour
Mar 10, 1945 - Daylight Saving Time Started
When local standard time was about to reach
Saturday, March 10, 1945, 11:00:00 pm clocks were turned forward 1 hour to
Sunday, March 11, 1945, 12:00:00 midnight local daylight time instead.
Sunrise and sunset were about 1 hour later on Mar 11, 1945 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.
Apr 21
Forward 1 hour
Apr 21, 1945 - Daylight Saving Time Increased
Double DST – Clocks were turned ahead another hour when DST was already in force (2 hours ahead of standard time).
When local daylight time was about to reach
Saturday, April 21, 1945, 11:00:00 pm clocks were turned forward 1 hour to
Sunday, April 22, 1945, 12:00:00 midnight local daylight time instead.
Sunrise and sunset were about 1 hour later on Apr 22, 1945 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.
Aug 26
Back 1 hour
Aug 26, 1945 - Daylight Saving Time Decreased
Double DST ended – Clocks were turned back from double DST (2 hours ahead of standard time) to DST (1 hour ahead of standard time).
When local daylight time was about to reach
Sunday, August 26, 1945, 12:00:00 midnight clocks were turned backward 1 hour to
Saturday, August 25, 1945, 11:00:00 pm local daylight time instead.
Sunrise and sunset were about 1 hour earlier on Aug 26, 1945 than the day before. There was more light in the morning and less light in the evening.
Also called Spring Forward, Summer Time, and Daylight Savings Time.
Oct 28
Back 1 hour
Oct 28, 1945 - Daylight Saving Time Ended
When local daylight time was about to reach
Sunday, October 28, 1945, 12:00:00 midnight clocks were turned backward 1 hour to
Saturday, October 27, 1945, 11:00:00 pm local standard time instead.
Sunrise and sunset were about 1 hour earlier on Oct 28, 1945 than the day before. There was more light in the morning and less light in the evening.
Also called Fall Back and Winter Time.
Daylight Saving Time History in Portugal
- Portugal first observed Daylight Saving Time in 1916.
- Portugal has observed DST for 105 years between 1916 and 2025.
- Previous time with no Daylight Saving Time was 1933.
- See Worldwide DST Statistics
