GST to IRST time converter

IRST is 30 minutes behind GST. When it is 9:00 AM in GST, it is 8:30 AM in IRST.

GST UTC+4

Friday, October 16, 2026

IRST UTC+3:30

Friday, October 16, 2026

GST
Gulf Standard Time
Fri, Oct 16
UTC+4
IRST
Iran Standard Time
Fri, Oct 16
UTC+3:30-30m
Finding your time zone…
Shared working hours (9:00–18:00)

GST to IRST conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

The difference stays 30 minutes all year.

More conversions

IRST to GSTGST to UTCGST to GMTGST to ESTGST to CSTGST to MSTGST to PSTGST to CETGST to MSKGST to PKTGST to ISTGST to SGTGST to PHT
UTC to IRSTGMT to IRSTEST to IRSTCST to IRSTMST to IRSTPST to IRSTCET to IRSTMSK to IRSTPKT to IRSTIST to IRSTSGT to IRSTPHT to IRST

Questions and answers

What is the time difference between GST and IRST?

IRST is 30 minutes behind GST.

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

When it is 9:00 AM in GST, it is 8:30 AM in IRST.

When is the best time to call IRST from GST?

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

Does the time difference between GST and IRST change?

No. The difference stays 30 minutes all year.