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.
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 "Tokyo" will show that there is no DST.
How does this tool determine the change date?
It uses your browser's timezone database to scan forward day by day from the current time for a change in UTC offset, then narrows the exact transition down to the hour using a binary search.