compare time zones

note: the first time time zone will be compared against all the others note: the dates are when DST changes in one or both time zones, in UTC
note: the local date may be slightly different, e.g. off-by-one

note: some time zones may be defunct
note: usually there is at least one time zone per country/dependency, but sometimes the official time zone is that of another country/dependency
note: G-20 (19 countries, minus EU/AU) west to east, other UN members (by 2-letter ISO code), other countries/dependencies/areas of special sovereignty

note: you can append a list to the URL e.g. 'compare-time-zones.htm?local,utc,demo'
note: you can specify any location listed in the drop-down menu e.g. 'london,new york,new_york'
note: you can specify any capital city e.g. 'ottawa,washington,london,canberra,wellington'
note: you can specify any 2-letter ISO country code to get the capital city time zone e.g. 'ca,us,gb,au,nz'
note: you can specify any 2-letter ISO country code and a '*' to get all time zones e.g. 'ca*,us*'
note: you can specify various custom abbreviations e.g. single: ',local,uk,uset,nyc', e.g. group: 'us4,g20,demo'
note: hover over a time zone to see more details
note: sources: countrycode.csv, List of tz database time zones - Wikipedia, retrieved 2025-07-14