๐ฐ๏ธ DST Change Date Calculator
Calculates the next DST change from now, based on your browser's timezone database.
Select a timezone to calculate when daylight saving time (DST) will next start or end there. It uses your browser's built-in timezone database (the IANA Time Zone Database), so it stays accurate even as countries change their DST rules.
How to use
- Select a timezone (city).
- The date and time of the next DST change is shown automatically.
- For timezones without DST, a message is shown instead.
How the calculation works
This tool shows when daylight saving time next starts or ends in the chosen city, in local time after the change. Using the world time zone data built into your browser (the IANA time zone database), it checks the offset from UTC one day at a time from now. When the offset changes, it narrows down that day with a binary search to find the exact minute of the switch. Rules in major regions United States: starts 2:00 on the second Sunday of March, ends 2:00 on the first Sunday of November Europe: starts 1:00 UTC on the last Sunday of March, ends 1:00 UTC on the last Sunday of October South-eastern Australia: starts on the first Sunday of October, ends on the first Sunday of April (the seasons are reversed in the southern hemisphere)
Worked example
Next switch as seen from September 19, 2026 New York: Sunday, November 1, 2026 โ 2:00 goes back to 1:00, UTCโ4 โ UTCโ5 London: Sunday, October 25, 2026 โ 2:00 goes back to 1:00, UTC+1 โ UTC+0 Sydney: Sunday, October 4, 2026 โ 2:00 jumps to 3:00, UTC+10 โ UTC+11 Tokyo: no daylight saving time
Things to be aware of
- When clocks go back, the same time (such as 1:30) happens twice. When they go forward, some times (such as 2:30) do not exist. Take care when scheduling.
- Daylight saving rules change by law. If your browserโs data is out of date, the latest changes may not be reflected.
- Japan used daylight saving time once, from 1948 to 1951, and has not since.
FAQ
What is daylight saving time (DST)?
DST is the practice of setting clocks forward by one hour during summer months to make better use of daylight. Many countries and regions start it around March and end it around October or November.
Does Tokyo observe daylight saving time?
No, Japan does not currently observe daylight saving time and uses UTC+9 year-round. Selecting โTokyoโ will show that there is no DST.
How does this tool determine the change date?
It uses your browserโs time zone database to scan forward day by day from the current time for a change in UTC offset, then narrows the transition down to the exact minute with a binary search.