Here are the principle cities by time zones. This is not a comprehensive list of the time zones, as it excludes certain zones in the Pacific and Atlantic that do not have major cities. Most of North America and Europe utilize daylight saving time, as well as some of the major cities in South America and Australia. During the summer months, daylight saving time adds one hour forward.
- UTC -1000: Honolulu
- UTC -0900: Anchorage
- UTC -0800: Los Angeles, Vancouver, Tijuana
- UTC -0700: Denver, Calgary
- UTC -0600: Chicago, Mexico City, Winnipeg
- UTC -0500: New York, Toronto, Lima
- UTC -0430: Caracas
- UTC -0400: Santiago, San Juan, Halifax
- UTC -0330: St. John's
- UTC -0300: Sao Paulo, Buenos Aires
- UTC ±0000: London, Lisbon, Casablanca, Accra
- UTC +0100: Paris, Rome, Berlin, Madrid, Lagos, Zurich, Stockholm
- UTC +0200: Cairo, Johannesburg, Athens, Istanbul, Helsinki, Jerusalem
- UTC +0300: Nairobi, Baghdad, Riyadh
- UTC +0330: Tehran
- UTC +0400: Moscow, Dubai
- UTC +0430: Kabul
- UTC +0500: Karachi
- UTC +0530: Delhi, Colombo
- UTC +0545: Kathmandu
- UTC +0600: Almaty, Dhaka
- UTC +0630: Yangon
- UTC +0700: Jakarta, Bangkok
- UTC +0800: Beijing, Hong Kong, Perth, Singapore
- UTC +0900: Tokyo, Seoul
- UTC +0930: Adelaide
- UTC +1000: Sydney
- UTC +1100: Vladivostok
- UTC +1200: Auckland, Suva
