Why offsets change
A city can move from one UTC offset to another when daylight saving time begins or ends. That means the difference between two cities may be different in March than in July or November.
Some places move clocks seasonally, others do not, and transition dates are not synchronized globally.
A city can move from one UTC offset to another when daylight saving time begins or ends. That means the difference between two cities may be different in March than in July or November.
Live clocks and converters use IANA identifiers such as Europe/Berlin or America/New_York. Those identifiers carry historical and current time-zone rules, unlike a fixed label such as UTC−5.
Sydney, Melbourne, Perth
Sao Paulo, Rio de Janeiro, Brasilia
Toronto, Vancouver, Montreal
Beijing, Shanghai, Shenzhen
Paris, Nice, Lyon
Berlin, Hamburg, Munich
Jakarta, Denpasar, Bali
Rome, Milano, Venice
Tokyo, Osaka, Kyoto
Oslo, Bergen, Tromsø
Seoul, Busan, Incheon
Madrid, Barcelona, Malaga
Zurich, Geneva, Basel
London, Manchester, Edinburgh
New York, Los Angeles, Chicago