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In listing all the Id properties of the TimeZoneInfos returned by TimeZoneInfo.GetSystemTimeZones, two versions of EST appear: US Eastern Standard Time and Eastern Standard Time. What's the difference?
I also see both US Mountain Standard Time and Mountain Standard Time, but I'm pretty sure that's because the US version is for Arizona, which doesn't observe DST. I'd assume the regular Mountain Standard Time applies for the rest of the US states in the Mountain time zone. Am I correct?
Helpful link on US time zones: http://www.timetemperature.com/tzus/time_zone.shtml
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EST and EDT: The Main Difference To remember it correctly, EST is when North Americans live with it during fall and winter. Meanwhile, EDT happens during spring and summer.
"US Eastern Standard Time" refers to the timezone for the majority of Indiana, which did not observe Daylight Saving Time before 2007. Similarly, "Canada Central Standard Time" is used for Saskatchewan, and "US Mountain Standard Time" for Arizona, which still do not observe DST. The time zone IDs are assigned in a somewhat illogical way.
Currently has same time zone offset as EST (UTC -5) but different time zone name. Eastern Standard Time (EST) is 5 hours behind Coordinated Universal Time (UTC). This time zone is in use during standard time in: North America, Caribbean, Central America. Where and When is EST Observed?
Currently has same time zone offset as EST (UTC -5) but different time zone name. Eastern Standard Time (EST) is 5 hours behind Coordinated Universal Time (UTC). This time zone is in use during standard time in: North America, Caribbean, Central America.
Almost half of the population in the USA live in the EST time zone. It spans from northern Canada and south to Panama near the Equator. In North America, Eastern Standard Time shares a border with Atlantic Standard Time (AST) in the east and with Central Standard Time (CST) in the west.
"US Eastern Standard Time" refers to the timezone for the majority of Indiana, which did not observe Daylight Saving Time before 2007. Similarly, "Canada Central Standard Time" is used for Saskatchewan, and "US Mountain Standard Time" for Arizona, which still do not observe DST.
The time zone IDs are assigned in a somewhat illogical way. The "No DST" version mentioned for e.g. the Cayman Islands is called "SA Pacific Standard Time" (SA = South America, and if you look at a timezone map you will see that the -05:00 offset applies to Colombia, Ecuador, and Peru on the west coast of South America)
For another example of timezone IDs "Greenwich Standard Time" which refers to the time zone used in Iceland, which is UTC+00:00 year-round with no DST, whereas "GMT Standard Time" refers to the British timezone which does have DST.
Each time zone corresponds to one of the menu items that you can select from the timezone control panel. This MSDN page shows the correspondence between the text in the menu and the actual timezone ID:
010 Mountain Standard Time (GMT-07:00) Mountain Time (US and Canada)
013 Mexico Standard Time 2 (GMT-07:00) Chihuahua, La Paz, Mazatlan
015 U.S. Mountain Standard Time (GMT-07:00) Arizona
020 Central Standard Time (GMT-06:00) Central Time (US and Canada)
025 Canada Central Standard Time (GMT-06:00) Saskatchewan
030 Mexico Standard Time (GMT-06:00) Guadalajara, Mexico City, Monterrey
033 Central America Standard Time (GMT-06:00) Central America
035 Eastern Standard Time (GMT-05:00) Eastern Time (US and Canada)
040 U.S. Eastern Standard Time (GMT-05:00) Indiana (East)
045 S.A. Pacific Standard Time (GMT-05:00) Bogota, Lima, Quito
085 GMT Standard Time (GMT) Greenwich Mean Time: Dublin, Edinburgh, Lisbon, London
090 Greenwich Standard Time (GMT) Casablanca, Monrovia
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