Daylight saving and time zone change finder
List a zone’s offset changes in a selected year, including non-DST political changes.
Preparing your tool…
How it works
Read transition instants from the bundled IANA zone rules and show offsets before and after.
Example
New York normally has one spring gap and one autumn repeated hour each year.
What should I check before using the result?
Future governments may change rules. The bundled data version is shown; changes are not holiday dates.