IRST to GST time converter

GST is 30 minutes ahead of IRST. When it is 9:00 AM in IRST, it is 9:30 AM in GST.

IRST UTC+3:30

Saturday, October 17, 2026

GST UTC+4

Saturday, October 17, 2026

IRST
Iran Standard Time
Sat, Oct 17
UTC+3:30
GST
Gulf Standard Time
Sat, Oct 17
UTC+4+30m
Finding your time zone…
Shared working hours (9:00–18:00)

IRST to GST conversion table

Every hour of today in IRST and the matching time in GST. Light rows are typical working hours (9:00–18:00).

IRSTGST
12:00 AM12:30 AM
1:00 AM1:30 AM
2:00 AM2:30 AM
3:00 AM3:30 AM
4:00 AM4:30 AM
5:00 AM5:30 AM
6:00 AM6:30 AM
7:00 AM7:30 AM
8:00 AM8:30 AM
9:00 AM9:30 AM
10:00 AM10:30 AM
11:00 AM11:30 AM
12:00 PM12:30 PM
1:00 PM1:30 PM
2:00 PM2:30 PM
3:00 PM3:30 PM
4:00 PM4:30 PM
5:00 PM5:30 PM
6:00 PM6:30 PM
7:00 PM7:30 PM
8:00 PM8:30 PM
9:00 PM9:30 PM
10:00 PM10:30 PM
11:00 PM11:30 PM

Best time to call or meet

Both sides are at work from 9:00 AM – 5:30 PM in IRST (9:30 AM – 6:00 PM in GST).

Daylight saving time and the difference

The difference stays 30 minutes all year.

More conversions

GST to IRSTIRST to UTCIRST to GMTIRST to ESTIRST to CSTIRST to MSTIRST to PSTIRST to CETIRST to MSKIRST to PKTIRST to ISTIRST to SGTIRST to PHT
UTC to GSTGMT to GSTEST to GSTCST to GSTMST to GSTPST to GSTCET to GSTMSK to GSTPKT to GSTIST to GSTSGT to GSTPHT to GST

Questions and answers

What is the time difference between IRST and GST?

GST is 30 minutes ahead of IRST.

What time is it in GST when it is 9 AM in IRST?

When it is 9:00 AM in IRST, it is 9:30 AM in GST.

When is the best time to call GST from IRST?

Both sides are at work from 9:00 AM – 5:30 PM in IRST (9:30 AM – 6:00 PM in GST).

Does the time difference between IRST and GST change?

No. The difference stays 30 minutes all year.