Daylight Saving Time Explained
Daylight saving time, often abbreviated as DST, is a seasonal system in which clocks are moved forward and later returned to standard time.
Moving clocks forward and back
When daylight saving time begins, a local clock can skip forward. When standard time returns, a local hour can be repeated. This can affect travel, appointments and international planning.
Not every place uses DST
Daylight-saving rules vary by country and region. Some locations do not change their clocks, and transition dates can differ between places.
Why time differences can change
Two cities can have one time difference during part of the year and another difference after a daylight-saving transition, especially when their clocks change on different dates.
Current local time
World Clock uses named regional time zones to display current local time with the appropriate present-day offset. The live city and country clocks follow your selected 12-hour or 24-hour display format.