Daylight saving and trading hours
Why your trading clock shifts twice a year - and whose schedule does the shifting.
Most exchanges quote hours in local time, which means their UTC equivalent moves by an hour twice a year as countries enter or leave daylight saving. The dates do not line up across regions.
The US
DST starts on the second Sunday of March and ends on the first Sunday of November. NYSE goes from EST (UTC-5) to EDT (UTC-4) and back.
Europe
DST starts the last Sunday in March and ends the last Sunday in October - two weeks after the US shifts forward, one week before it shifts back. For those two weeks, the New York-London time difference is four hours instead of five.
Most of Asia and the Gulf
No DST. Tokyo, Hong Kong, Shanghai, Singapore, Riyadh, Dubai - all stay on a single offset year-round.
This site handles all of it automatically - the times you see are always the exchange's current local clock, with DST applied if it applies.