What is the time difference between Singapore and Kolkata?

Kolkata is 2 hours 30 minutes behind Singapore. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Kolkata from Singapore?

Between 11:30–18:00 in Singapore, which is 09:00–15:30 in Kolkata. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Singapore observe daylight saving time?

No. Singapore stays on UTC+8 all year, so its clocks never move.

Does Kolkata observe daylight saving time?

No. Kolkata stays on UTC+5:30 all year, so its clocks never move.

If it is midday in Singapore, what time is it in Kolkata?

It is 09:30 in Kolkata, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.

Which time zones do Singapore and Kolkata use?

Singapore uses Asia/Singapore, currently UTC+8, and Kolkata uses Asia/Kolkata, currently UTC+5:30 (IST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Singapore time to Kolkata time

Kolkata is 2 hours 30 minutes behind Singapore right now, so midday in Singapore lands in the morning in Kolkata.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Every hour of a day in Singapore, and what the clock reads in Kolkata at that same moment.

Singapore	Kolkata
00:00	21:30previous day
01:00	22:30previous day
02:00	23:30previous day
03:00	00:30
04:00	01:30
05:00	02:30
06:00	03:30
07:00	04:30
08:00	05:30
09:00	06:30
10:00	07:30
11:00	08:30
12:00	09:30
13:00	10:30
14:00	11:30
15:00	12:30
16:00	13:30
17:00	14:30
18:00	15:30
19:00	16:30
20:00	17:30
21:00	18:30
22:00	19:30
23:00	20:30

Daylight saving time

Neither Singapore nor Kolkata changes its clocks, so the difference between them is the same every day of the year.

Singapore

Does not observe daylight saving time

Standard: UTC+8

Kolkata

Does not observe daylight saving time

Standard: UTC+5:30

When you can actually talk

The window is 6 hours 30 minutes wide — 11:30–18:00 in Singapore, 09:00–15:30 in Kolkata.

Singapore 11:30–18:00Kolkata 09:00–15:30

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	Singapore	Kolkata
IANA zone	Asia/Singapore	Asia/Kolkata
Abbreviation	UTC+8	IST
Standard offset	UTC+8	UTC+5:30
Daylight offset	—	—
Clock changes this year	0	0
Country	Singapore	India

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Singapore and Kolkata?: Kolkata is 2 hours 30 minutes behind Singapore. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Kolkata from Singapore?: Between 11:30–18:00 in Singapore, which is 09:00–15:30 in Kolkata. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Singapore observe daylight saving time?: No. Singapore stays on UTC+8 all year, so its clocks never move.
Does Kolkata observe daylight saving time?: No. Kolkata stays on UTC+5:30 all year, so its clocks never move.
If it is midday in Singapore, what time is it in Kolkata?: It is 09:30 in Kolkata, on the same calendar date. That holds for the current offsets; it does not change through the year, because neither city moves its clocks.
Which time zones do Singapore and Kolkata use?: Singapore uses Asia/Singapore, currently UTC+8, and Kolkata uses Asia/Kolkata, currently UTC+5:30 (IST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.