Transition dates are given as local time in the affected zone.
Northern hemisphere
European Unionlast Sun Mar to last Sun Oct
United Kingdomlast Sun Mar to last Sun Oct
United Statessecond Sun Mar to first Sun Nov
Canadasecond Sun Mar to first Sun Nov
Mexicono longer observed
Iranno longer observed
Southern hemisphere
Australia, most statesfirst Sun Oct to first Sun Apr
New Zealandlast Sun Sep to first Sun Apr
Chilefirst Sun Sep to first Sun Apr
Paraguayno longer observed
Brazilno longer observed
No daylight saving
JapanUTC+09:00 all year
IndiaUTC+05:30 all year
ChinaUTC+08:00 all year
RussiaUTC+02:00 to +12:00 all year
IcelandUTC+00:00 all year
TurkeyUTC+03:00 all year
Rules change by legislation. Applications should read the current time zone database rather than hard coding transitions.