IRST to JST time converter

JST is 5 hours 30 minutes ahead of IRST. When it is 9:00 AM in IRST, it is 2:30 PM in JST.

IRST UTC+3:30

Saturday, October 17, 2026

JST UTC+9

Saturday, October 17, 2026

IRST
Iran Standard Time
Sat, Oct 17
UTC+3:30
JST
Japan Standard Time
Sat, Oct 17
UTC+9+5h 30m
Finding your time zone…
Shared working hours (9:00–18:00)

IRST to JST conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

The difference stays 5 hours 30 minutes all year.

More conversions

JST to IRSTIRST to UTCIRST to GMTIRST to ESTIRST to CSTIRST to MSTIRST to PSTIRST to CETIRST to MSKIRST to GSTIRST to PKTIRST to ISTIRST to SGT
UTC to JSTGMT to JSTEST to JSTCST to JSTMST to JSTPST to JSTCET to JSTMSK to JSTGST to JSTPKT to JSTIST to JSTSGT to JST

Questions and answers

What is the time difference between IRST and JST?

JST is 5 hours 30 minutes ahead of IRST.

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

When it is 9:00 AM in IRST, it is 2:30 PM in JST.

When is the best time to call JST from IRST?

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

Does the time difference between IRST and JST change?

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