Current GMT Time

What is GMT?

GMT (Greenwich Mean Time) is the timezone at zero UTC offset, historically defined by the mean solar time at the Royal Observatory in Greenwich, London. It has been used as the international time standard since 1884 and is the basis for UTC.

When GMT differs from UTC

In strict astronomical terms, GMT can vary from UTC by up to 0.9 seconds because Earth's rotation is not perfectly uniform. UTC corrects for this with occasional leap seconds. In practice, software and networking always use UTC — GMT remains in everyday language and HTTP headers.

Convert GMT to other timezones (GMT to EST, GMT time zone to CST)

GMT sits at UTC+00:00 and is the reference for every other zone. Common pairwise conversions: GMT to EST time conversion, GMT time zone to CST, and GMT to UTC. For software purposes GMT and UTC are interchangeable — most JavaScript and HTTP "GMT" labels are actually UTC.

• GMT to EST time conversion / gmt to est — GMT is 5 hours ahead of EST in winter; 12:00 GMT = 07:00 EST
• GMT time zone to CST — GMT is 6 hours ahead of US CST in winter; 12:00 GMT = 06:00 CST
• GMT to PST — GMT is 8 hours ahead of PST in winter; 12:00 GMT = 04:00 PST
• GMT to IST — GMT is 5.5 hours behind IST; 12:00 GMT = 17:30 IST
• GMT ↔ UTC: identical for everyday and most programming purposes

GMT aliases: PDT to GMT, time calculator GMT, Zulu

GMT sits at UTC+00:00; for software it is identical to UTC. Additional pairwise queries: "pdt to gmt" and "time calculator gmt". Zulu time is the military/aviation alias for the same offset.

• PDT to GMT / pdt to gmt — PDT (UTC-7) is 7 hours behind GMT; 09:00 PDT = 16:00 GMT
• Time calculator GMT / time calculator gmt — any converter on this site accepts GMT as source or destination zone
• GMT to PDT — GMT − 7 = PDT in summer; GMT − 8 = PST in winter
• GMT also written as UTC, Z, or Zulu — all the same +00:00 offset

GMT converter, EST↔GMT, GMT to IST

More GMT search phrasings: "gmt converter", "est convert to gmt", "convert gmt to est", "gmt time to ist", "convert et to est" (ET = umbrella for EST/EDT).

• GMT converter / gmt converter — same as UTC converter; GMT ≡ UTC for software purposes.
• EST convert to GMT / est convert to gmt — EST + 5 = GMT in winter; 12:00 EST = 17:00 GMT.
• Convert GMT to EST / convert gmt to est — GMT − 5 = EST in winter; GMT − 4 = EDT in summer.
• GMT time to IST / gmt time to ist — GMT + 5:30 = IST; 12:00 GMT = 17:30 IST.
• Convert ET to EST / convert et to est — ET (Eastern Time) collapses to EST in winter and EDT in summer; both are the same clock with different abbreviations.

GMT converter time, EST↔GMT, GMT↔CST, GMT to IST

More GMT queries: "gmt converter time", "est to gmt converter", "gmt to cst time conversion".

• GMT converter time / gmt converter time — same as UTC converter; GMT ≡ UTC for software purposes
• EST to GMT converter / est to gmt converter — EST + 5 = GMT in winter; 12:00 EST = 17:00 GMT
• GMT to CST time conversion / gmt to cst time conversion — GMT − 6 = CST in winter; GMT − 5 = CDT in summer

GMT to Eastern time converter, GMT to EST calculator, GMT↔CST/Central

More GMT queries: "gmt to eastern time converter", "gmt to est calculator", "gmt to est time converter".

• GMT to Eastern time converter / gmt to eastern time converter — GMT − 5 = EST in winter; GMT − 4 = EDT in summer
• GMT to EST calculator / gmt to est calculator / gmt to est time converter — same conversion
• Convert GMT to CST / convert gmt to cst — GMT − 6 = CST in winter; GMT − 5 = CDT in summer
• EST to GMT time converter / est to gmt time converter — EST + 5 = GMT in winter; EDT + 4 = GMT in summer
• Convert central time to GMT / convert central time to gmt — US CST + 6 = GMT in winter; CET − 1 = GMT
• PDT timezone GMT / pdt timezone gmt / pdt 时间 GMT — PDT + 7 = GMT; 09:00 PDT = 16:00 GMT