What is daylight saving time (DST)?
DST is a seasonal clock adjustment used in many places to shift daylight hours.
Daylight Saving Time (DST)
Daylight Saving Time (DST) is a seasonal clock change used in many regions to shift daylight hours. Rules vary by country and sometimes by zone, so always verify the exact location before scheduling.
DST quick links
Definitions & Guides
Direct answer
Daylight saving time shifts local clocks in some countries, usually in spring and autumn.
Rules vary by country and year, so use the 2026 links below for exact details.
Key facts
- DST policy depends on country and sometimes region.
- Transition dates can differ across hemispheres.
- Use year-specific country pages for exact clock changes.
Browse by year
Open DST summaries by year for policy checks and seasonal transition planning.
Popular countries
Quick country entry points for high-demand DST lookups across the US, UK, Canada, Australia, and major EU markets.
Countries that observe DST this year
Based on the current generated rules, these countries have at least one mapped zone with DST activity in 2026.
Frequently asked questions
Do all countries use DST?
No. Some countries use DST, while many keep one time all year.
Can DST rules change?
Yes. Governments can change DST policies, so year-specific pages are important.
How can I avoid DST scheduling mistakes?
Use timezone-aware tools with exact dates and IANA zones instead of fixed offsets.