Time Zone Calculator
Convert date and time between any two world time zones
Date & Time
From Time Zone
To Time Zone
Converted Time
Destination Time
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UTC Time
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Time Difference
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From Offset
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To Offset
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About Time Zones
Time zones are defined by their offset from UTC (Coordinated Universal Time). India Standard Time (IST) is UTC+5:30 — one of the few time zones with a half-hour offset. The US spans 6 time zones (Hawaii to Eastern). Many regions observe Daylight Saving Time (DST) which shifts clocks by 1 hour seasonally — this calculator handles DST automatically.
Common use cases: scheduling international calls, converting meeting times for remote teams, calculating delivery windows for international shipments. IST to EST difference is 10.5 hours (IST ahead); IST to PST is 13.5 hours ahead.
lightbulb Example
9:00 AM IST → New York EST:
1IST = UTC+5:30 → UTC 3:30 AM
2EST = UTC-5 → 10:30 PM prev. day
✓ 9 AM IST = 10:30 PM EST (previous day)