KST to IRST time converter

IRST is 5 hours 30 minutes behind KST. When it is 9:00 AM in KST, it is 3:30 AM in IRST.

KST UTC+9

Sunday, October 18, 2026

IRST UTC+3:30

Sunday, October 18, 2026

KST
Korea Standard Time
Sun, Oct 18
UTC+9
IRST
Iran Standard Time
Sun, Oct 18
UTC+3:30-5h 30m
Finding your time zone…
Shared working hours (9:00–18:00)

KST to IRST conversion table

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

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

Best time to call or meet

Both sides are at work from 2:30 PM – 6:00 PM in KST (9:00 AM – 12:30 PM in IRST).

Daylight saving time and the difference

The difference stays 5 hours 30 minutes all year.

More conversions

IRST to KSTKST to UTCKST to GMTKST to ESTKST to CSTKST to MSTKST to PSTKST to CETKST to MSKKST to GSTKST to PKTKST to ISTKST to SGT
UTC to IRSTGMT to IRSTEST to IRSTCST to IRSTMST to IRSTPST to IRSTCET to IRSTMSK to IRSTGST to IRSTPKT to IRSTIST to IRSTSGT to IRST

Questions and answers

What is the time difference between KST and IRST?

IRST is 5 hours 30 minutes behind KST.

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

When it is 9:00 AM in KST, it is 3:30 AM in IRST.

When is the best time to call IRST from KST?

Both sides are at work from 2:30 PM – 6:00 PM in KST (9:00 AM – 12:30 PM in IRST).

Does the time difference between KST and IRST change?

No. The difference stays 5 hours 30 minutes all year.