Kolkata to Surabaya Time Difference
🇮🇳 Kolkata is currently 1.5 hours ahead of 🇮🇩 Surabaya.
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Atin 🇮🇳 Kolkata→it will be—in 🇮🇩 Surabaya
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Difference
+1.5h
Business overlap
7h
Distance
4,249 km
Approx. flight
5h
Hour-by-Hour: Kolkata to Surabaya
| 🇮🇳 Kolkata | 🇮🇩 Surabaya | Note |
|---|---|---|
| 12:00 AM | 1:30 AM | |
| 1:00 AM | 2:30 AM | |
| 2:00 AM | 3:30 AM | |
| 3:00 AM | 4:30 AM | |
| 4:00 AM | 5:30 AM | |
| 5:00 AM | 6:30 AM | |
| 6:00 AM | 7:30 AM | |
| 7:00 AM | 8:30 AM | |
| 8:00 AM | 9:30 AM | |
| 9:00 AM | 10:30 AM | |
| 10:00 AM | 11:30 AM | |
| 11:00 AM | 12:30 PM | |
| 12:00 PM | 1:30 PM | |
| 1:00 PM | 2:30 PM | |
| 2:00 PM | 3:30 PM | |
| 3:00 PM | 4:30 PM | |
| 4:00 PM | 5:30 PM | |
| 5:00 PM | 6:30 PM | |
| 6:00 PM | 7:30 PM | |
| 7:00 PM | 8:30 PM | |
| 8:00 PM | 9:30 PM | |
| 9:00 PM | 10:30 PM | |
| 10:00 PM | 11:30 PM | |
| 11:00 PM | 12:30 AM(next day) | Next day |
Daylight Saving Time (DST)
Neither Kolkata nor Surabaya observes Daylight Saving Time. The time difference is always 1.5 hours ahead.
Best Meeting Times
There are 7 overlapping business hours between Kolkata and Surabaya (9 AM – 6 PM in each city).
🇮🇳 Kolkata
9:00 AM – 4:00 PM
🇮🇩 Surabaya
10:30 AM – 5:30 PM
Frequently Asked Questions
What is the time difference between Kolkata and Surabaya?
The time difference between Kolkata and Surabaya is currently 1.5 hours ahead. Kolkata uses GMT+5:30 (UTC+5:30), while Surabaya uses GMT+7 (UTC+7).
When it's noon in Kolkata, what time is it in Surabaya?
When it's 12:00 PM (noon) in Kolkata, it is 1:30 PM in Surabaya. Use our calculator above to convert any other time.
Does the time difference between Kolkata and Surabaya change?
No. The time difference between Kolkata and Surabaya is always 1.5 hours ahead — neither city observes Daylight Saving Time, so the offset never changes.
What are the best times to schedule a call between Kolkata and Surabaya?
The best time to call is between 9:00 AM and 4:00 PM in Kolkata (which is 10:30 AM – 5:30 PM in Surabaya). This 7-hour window falls within business hours in both cities.
Is Kolkata ahead or behind Surabaya?
Kolkata is currently 1.5 hours behind Surabaya.
What time zone is Kolkata in?
Kolkata is in the Asia/Kolkata time zone, currently using GMT+5:30 (UTC+5:30). Kolkata does not observe Daylight Saving Time.
What time is midnight in Kolkata in Surabaya?
When it is midnight (12:00 AM) in Kolkata, it is 1:30 AM in Surabaya.