Your Next Time Change
What is Daylight Saving Time?
Daylight Saving Time (DST) is the practice of setting clocks forward by one hour during warmer months to extend evening daylight. This system affects over 1.5 billion people worldwide, though not all countries or regions participate.
70+ Countries
Observe some form of DST
Twice Yearly
Spring forward, fall back
Energy Savings
Originally for conservation
Different Dates
Varies by country/region
Popular Locations
Quick Links by Year
Time Zone Tools
Time Zone Converter
toWhy do we have Daylight Saving Time?
DST was originally implemented to save energy during wartime and to make better use of daylight. Today, its benefits are debated, with arguments both for and against its continuation.
Which places don't observe DST?
Hawaii, most of Arizona, and several US territories don't observe DST. Internationally, most of Africa and Asia don't use DST. Some countries near the equator don't need it due to consistent daylight hours year-round.
Is DST the same worldwide?
No, different regions change their clocks on different dates. The Northern and Southern hemispheres also have opposite seasons, so Australia's DST occurs during Northern Hemisphere winter months.
How do I remember which way to change my clock?
"Spring forward, fall back" is the most common mnemonic device. In spring, clocks move forward one hour; in fall (autumn), they move back one hour.
What happens to automated systems during DST?
Most modern computer systems and smartphones automatically adjust for DST based on timezone settings. However, some older systems and devices may need manual adjustment.