About the Daylight Saving Time Calculator
This daylight saving time calculator tells you exactly when the clocks “spring forward” and “fall back” in your region for any year from 2008 to 2100 — the date, the weekday and the local time of the change — along with the standard and daylight UTC offsets and how many days the daylight-saving season lasts.
It covers the rules used by most of North America (second Sunday in March to first Sunday in November), the UK and European Union (last Sunday in March to last Sunday in October, changing at 01:00 UTC everywhere), south-eastern Australia and New Zealand, where the seasons are reversed. The ten-year table is handy for scheduling recurring meetings, flights, payroll night shifts and server jobs across the change.
Dates are calculated from the rules currently in law and assume those rules stay unchanged; governments occasionally change them (the US has debated permanent DST, and the EU has discussed ending clock changes). Arizona (outside the Navajo Nation), Hawaii and most of Asia, Africa and South America do not observe DST.
How to use the daylight saving time calculator
- 1Choose your region or time zone.
- 2Enter the year you want to check.
- 3Read the spring-forward and fall-back dates and the exact local times.
- 4Check the standard and daylight UTC offsets for your zone.
- 5Use the 10-year table to plan recurring events around future clock changes.
Formula and method
Clock-change dates are defined by rules of the form “nth (or last) Sunday of a month”. The calculator finds the weekday of the 1st (or last) day of the month and steps forward (or back) to the required Sunday. The US and Canada have used the second-Sunday-in-March / first-Sunday-in-November rule since 2007 under the Energy Policy Act of 2005; the change happens at 2:00 AM local time in each zone.
The EU and UK switch on the last Sundays of March and October at 01:00 UTC, which is 1:00 AM in London, 2:00 AM in Paris and 3:00 AM in Athens. South-eastern Australia runs from the first Sunday in October to the first Sunday in April, and New Zealand from the last Sunday in September to the first Sunday in April (both starting at 2:00 AM standard time and ending at 3:00 AM daylight time). For these regions the start date, end date and season length all describe the season that begins in the chosen year and ends the following April; the April change earlier in the chosen year is shown separately as the previous season’s end.
Worked examples
US Eastern time, 2026
In 2026 the second Sunday in March is 8 March, when 2:00 AM EST becomes 3:00 AM EDT. Clocks fall back on the first Sunday in November, 1 November. Daylight time lasts 238 days.
UK clocks in 2027
British Summer Time starts on the last Sunday in March, 28 March 2027, at 1:00 AM GMT, and ends on the last Sunday in October, 31 October 2027, when 2:00 AM BST goes back to 1:00 AM.
Sydney, 2026 season
In New South Wales the 2026–27 season starts on the first Sunday of October (4 October 2026, 2:00 AM AEST → 3:00 AM AEDT) and ends on the first Sunday of April (4 April 2027, 3:00 AM AEDT → 2:00 AM) — 182 days. The previous season ended earlier in 2026, on 5 April.
New Zealand, 2026 season
New Zealand daylight time starts on the last Sunday in September (27 September 2026) at 2:00 AM NZST and ends on the first Sunday in April (4 April 2027) at 3:00 AM NZDT, a season of 189 days.
Frequently asked questions
When does daylight saving time start and end in the US?+
Since 2007 US DST starts at 2:00 AM on the second Sunday in March and ends at 2:00 AM on the first Sunday in November. In 2026 that is 8 March and 1 November; in 2027 it is 14 March and 7 November.
Do the clocks go forward or back in spring?+
Spring forward, fall back: clocks go forward one hour in spring (you lose an hour) and back one hour in autumn (you gain an hour).
Which US states do not observe daylight saving time?+
Hawaii and most of Arizona stay on standard time all year (the Navajo Nation in Arizona does observe DST). US territories such as Puerto Rico, Guam and the US Virgin Islands also do not use DST.
Why do the US and UK change clocks on different dates?+
The US uses the second Sunday of March and first Sunday of November, while the UK and EU use the last Sundays of March and October. For two to three weeks in March and about one week around the end of October the time difference between New York and London is 4 hours instead of 5.
Is daylight saving time being abolished?+
Proposals exist — the US Sunshine Protection Act would make DST permanent and the EU Parliament voted in 2019 to end seasonal changes — but as of 2026 neither has taken effect, so clocks still change.