World Timezones

Kolkata to Istanbul Converter

Compare Istanbul to Kolkata instead
Kolkata3:49 pmSat, Jul 25
KolkataIST
India · UTC+5:30
3:49 pmSat, Jul 25
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
IstanbulTRT
Turkey · UTC+3
1:19 pmSat, Jul 25
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p

Offset

The time difference between Kolkata and Istanbul is 2.5 hours.

2.5 hours

Kolkata (IST) is ahead of Istanbul (TRT).

IST: UTC+5:30

TRT: UTC+3

Neither Kolkata nor Istanbul is currently observing daylight saving time.

When to schedule

Business-hours overlap: 12 PM–5 PM in Kolkata (9 AM–2 PM in Istanbul).

Both teams are in working hours during this window on weekdays.

Suggested time: 2:00 PM Kolkata (11:30 AM Istanbul).

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

Turkey

  • New Year's DayThu, Jan 1
  • National Independence & Children's DayThu, Apr 23
  • Labour DayFri, May 1
  • Atatürk Commemoration & Youth DayTue, May 19
  • Democracy and National Unity DayWed, Jul 15
  • Victory DaySun, Aug 30
  • Republic DayThu, Oct 29

About these zones

Kolkata uses India Standard Time (IST). To call India, dial +91.

Istanbul uses Turkey Time (TRT). To call Turkey, dial +90.

Istanbul is approximately 3,650 miles northwest of Kolkata.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

KolkataIstanbulDay
12:00 am9:30 pm-1 day
1:00 am10:30 pm-1 day
2:00 am11:30 pm-1 day
3:00 am12:30 amSame day
4:00 am1:30 amSame day
5:00 am2:30 amSame day
6:00 am3:30 amSame day
7:00 am4:30 amSame day
8:00 am5:30 amSame day
9:00 am6:30 amSame day
10:00 am7:30 amSame day
11:00 am8:30 amSame day
12:00 pm9:30 amSame day
1:00 pm10:30 amSame day
2:00 pm11:30 amSame day
3:00 pm12:30 pmSame day
4:00 pm1:30 pmSame day
5:00 pm2:30 pmSame day
6:00 pm3:30 pmSame day
7:00 pm4:30 pmSame day
8:00 pm5:30 pmSame day
9:00 pm6:30 pmSame day
10:00 pm7:30 pmSame day
11:00 pm8:30 pmSame day

Daylight saving time

Neither Kolkata nor Istanbul observes daylight saving time. The offset between these zones remains constant year-round.

See the daylight saving time page for transition dates across every time zone.

Daylight today

Kolkata
Sunrise
5:06 AM
Sunset
6:22 PM
Day length
13h 16m
Istanbul
Sunrise
5:54 AM
Sunset
8:29 PM
Day length
14h 35m

Daylight overlap: 9h 58m — 8:24 AM–6:22 PM in Kolkata (5:54 AM–3:52 PM in Istanbul). Both locations are in daylight during this window.

Cities in these zones

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in India Standard Time

  • BOM
  • NMI
  • DEL
  • BLR
  • HYD
  • AMD
  • MAA
  • CCU
  • STV
  • PNQ

Airports in Turkey Time

  • IST
  • SAW
  • ESB
  • YEI
  • ADB
  • GZT
  • DIY
  • ADA
  • COV
  • ASR

Related conversions

Common conversions

What is 9:00 am Kolkata in Istanbul?
9:00 am Kolkata is 6:30 am Istanbul.
What is 12:00 pm Kolkata in Istanbul?
12:00 pm Kolkata is 9:30 am Istanbul.
What is 12:30 pm Kolkata in Istanbul?
12:30 pm Kolkata is 10:00 am Istanbul.
What is 2:00 pm Kolkata in Istanbul?
2:00 pm Kolkata is 11:30 am Istanbul.
What is 5:00 pm Kolkata in Istanbul?
5:00 pm Kolkata is 2:30 pm Istanbul.
What is 11:30 pm Kolkata in Istanbul?
11:30 pm Kolkata is 9:00 pm Istanbul.