Convert IST to IST — Time Difference Between India Standard Time and India Standard Time
Drag the slider or click the time display to type a specific hour and instantly convert IST to IST — India Standard Time and India Standard Time are in the same timezone. Scroll down to browse the full IST to IST conversion table, check what time 9 AM, 10 AM, 11 AM, or 12 PM in Colombo is in Kolkata, and use the date picker to compare times on any day for accurate scheduling.
IST
India Standard Time
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IST
India Standard Time
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IST to IST Time Zone Difference — Hour-by-Hour Conversion Table
Scan each row to find what time any hour in Colombo is in Kolkata — tap the arrows to jump between days, click "Today" to reset, and use the color-coded bands to quickly spot overlapping work hours, early mornings, and late nights at a glance.
| IST (Colombo) | IST (Kolkata) |
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How to Convert IST to IST
Drag the slider on the IST timeline to pick your time — the IST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.
What Is the Time Difference Between IST and IST?
India Standard Time (IST) and India Standard Time (IST) share the same UTC offset (UTC+5:30), so there is no time difference between Colombo and Kolkata.
What Time Is It Now in Colombo?
What Time Is It Now in Kolkata?
IST to IST Meeting Planner
Use the color-coded table above to find overlapping work hours between Colombo and Kolkata. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.
Why Trust This IST to IST Converter?
Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.
India Standard Time
- Abbreviation
- IST
- UTC Offset
- UTC+5:30
- City
- Colombo
- Country
- Sri Lanka
India Standard Time
- Abbreviation
- IST
- UTC Offset
- UTC+5:30
- City
- Kolkata
- Country
- India