Time Zones
Many computer operating systems (such as Linux, UNIX, OS X, and Microsoft Windows) and programming languages (such as Java, perl, and most shell languages) allow a local time zone setting in the format of (Standard Time Zone abbreviation)(UTC hour difference)(Daylight Saving Time Zone abbreviation). This allows programs and programming languages that must do calculations based on local time to more easily calculate differences between local time and UTC, as well as knowing whether calculations should be changed during Daylight Saving Time. For example, a time zone setting of EST5EDT indicates that local time on the computer is 5 hours behind UTC and should be adjusted for Daylight Saving Time.
| Time Zone | Standard Time | Daylight Saving Time |
|---|---|---|
| Eastern Time Zone | EST (UTC-5) | EDT(UTC-4) |
| Central Time Zone | CST (UTC-6) | CDT (UTC-5) |
| Mountain Time Zone | MST (UTC-7) | MDT (UTC-6) |
| Pacific Time Zone | PST (UTC-8) | PDT (UTC-7) |
| Alaska Time Zone | AKST (UTC-9) | AKDT (UTC-8) |
| Hawaii-Aleutian Time Zone | HAST (UTC-10) | HADT (UTC-9) Aleutian Islands only |
Read more about this topic: Daylight Saving Time In The United States
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