World Time Zone Converter & Meeting Planner
Converts local clock times across global time zones (IST, UTC, EST, PST, GMT, CET, JST) with daylight saving offset adjustments.
Relative Day: Same day
How This Calculation Formula is Formulated
Translates local clock times between international time zones based on standard UTC meridian offsets, adjusting for date-line crossing.
Variable Definitions & Measurement Units
7:30 PM IST to New York (EST)
Converting 19:30 India Standard Time (UTC+5:30) to Eastern Standard Time (UTC-5).
The Prime Meridian and the International Date Line
Standard time zones are referenced against Greenwich Mean Time / UTC established at the Royal Observatory in Greenwich, London.
When traveling or converting west across the International Date Line in the Pacific, you add a calendar day (+24 hours); moving east subtracts a day.
Frequently Asked Questions About World Time Zone Converter & Meeting Planner
Why does India have a half-hour offset (UTC+5:30)?
India selected a central longitude of 82.5° East (passing through Mirzapur, UP) as its standard meridian, which corresponds mathematically to exactly 5 hours and 30 minutes ahead of UTC.
What is Daylight Saving Time (DST)?
Many regions (like the US and Europe) advance clocks by 1 hour during summer months, changing EST (UTC-5) to EDT (UTC-4).
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