Is GMT the same as UTC?

For most practical purposes, yes — GMT and UTC are within milliseconds of each other. The technical difference is that UTC is defined by atomic clocks and occasionally adds leap seconds, while GMT is astronomically defined. In business contexts, treat them as equivalent.

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Time Zone Abbreviations: EST, PST, GMT, UTC — A Complete Reference

Sunil Kalikayi4/8/20264 min read

Common US Time Zones

EST (Eastern Standard Time): UTC-5 — only in winter. EDT (Eastern Daylight Time): UTC-4 — only in summer. PST (Pacific Standard): UTC-8 winter. PDT (Pacific Daylight): UTC-7 summer. Many people use EST/PST year-round incorrectly — during summer, it's technically EDT/PDT. ET (Eastern Time) and PT (Pacific Time) are the DST-agnostic terms.

International Abbreviations

GMT (Greenwich Mean Time): essentially UTC+0 but technically refers to the UK's standard time. UTC (Coordinated Universal Time): the global reference — never shifts for DST. IST (Indian Standard Time): UTC+5:30. CST (China Standard Time): UTC+8 — not to be confused with US Central Standard Time (UTC-6). CET (Central European Time): UTC+1 winter. CEST (Central European Summer Time): UTC+2 summer.