IRST (Tehran) to IST (Kolkata) Time Converter

Convert time between IRST (Tehran) and IST (Kolkata)

Live updates
12:25 AM→02:25 AM
IST (Kolkata) is 2h ahead of IRST (Tehran)

From

IRST (Tehran)

City:
Tehran
Country:
Islamic Republic of Iran
UTC Offset:
UTC+3:30
Local Time:
12:25 AMNight

To

IST (Kolkata)

City:
Kolkata
Country:
India
UTC Offset:
UTC+5:30
Local Time:
02:25 AMNight

Time Analysis

Smart Insights

Best time to call

IST (Kolkata) morning

IRST (Tehran) is sleeping

Working hours overlap

7 hours

9 AM - 5 PM window

24-Hour Comparison

Quick reference for the full day

UTC → IRST (Tehran) → IST (Kolkata)

IRST (Tehran) Business Hours

Business Hours: 9:00 AM - 5:00 PM (UTC +03:30)

IST (Kolkata) Business Hours

Business Hours: 9:00 AM - 5:00 PM (UTC +05:30)

Best time to schedule meetings: When both timezones are in business hours (9 AM - 5 PM)

IRST (Tehran) is 2h behind of IST (Kolkata)

UTC
IRST (Tehran)9AM-5PM
IST (Kolkata)9AM-5PM
00:00Oct 22
03:30Oct 22
05:30Oct 22
01:00Oct 22
04:30Oct 22
06:30Oct 22
02:00Oct 22
05:30Oct 22
07:30Oct 22
03:00Oct 22
06:30Oct 22
08:30Oct 22
04:00Oct 22
07:30Oct 22
09:30Oct 22
05:00Oct 22
08:30Oct 22
10:30Oct 22
06:00Oct 22
09:30Oct 22
11:30Oct 22
07:00Oct 22
10:30Oct 22
12:30Oct 22
08:00Oct 22
11:30Oct 22
13:30Oct 22
09:00Oct 22
12:30Oct 22
14:30Oct 22
10:00Oct 22
13:30Oct 22
15:30Oct 22
11:00Oct 22
14:30Oct 22
16:30Oct 22
12:00Oct 22
15:30Oct 22
17:30Oct 22
13:00Oct 22
16:30Oct 22
18:30Oct 22
14:00Oct 22
17:30Oct 22
19:30Oct 22
15:00Oct 22
18:30Oct 22
20:30Oct 22
16:00Oct 22
19:30Oct 22
21:30Oct 22
17:00Oct 22
20:30Oct 22
22:30Oct 22
18:00Oct 22
21:30Oct 22
23:30Oct 22
19:00Oct 22
22:30Oct 22
00:30 (next day)Oct 23
20:00NowOct 22
23:30Oct 22
01:30 (next day)Oct 23
21:00Oct 22
00:30 (next day)Oct 23
02:30 (next day)Oct 23
22:00Oct 22
01:30 (next day)Oct 23
03:30 (next day)Oct 23
23:00Oct 22
02:30 (next day)Oct 23
04:30 (next day)Oct 23
Current UTC hour
Overlap (Both 9AM-5PM)
IRST (Tehran) only
IST (Kolkata) only
Overlap dot
(next day)
(prev day)

Popular Conversions

Most requested time zone pairs

Loading related conversions...
?

Frequently Asked Questions

About IRST (Tehran) to IST (Kolkata) time conversion

General Questions

IST (Kolkata)is2 hoursahead ofIRST (Tehran)

IRST (Tehran)

12:00 AM

IST (Kolkata)

2:00 AM

Conversely, when it is 12:00 AM in IST (Kolkata), it is 10:00 PM in IRST (Tehran).

Business & Meetings

Travel Planning

Technical Details