Convert IRST to JST — Time Difference Between Iran Standard Time and Japan Standard Time

How to Convert IRST to JST

Drag the slider on the IRST timeline to pick your time — the JST time updates instantly. You can also click the time display to type a specific hour or pick one from the 15-minute interval dropdown, and use the date picker to check a different day.

What Is the Time Difference Between IRST and JST?

Japan Standard Time (JST) is 5:30 hours ahead of Iran Standard Time (IRST). To convert, add 5:30 hours — for example, 9:00 AM IRST is 2:30 PM JST.

IRST to JST Quick Reference

IRST to JST Meeting Planner

Use the color-coded table above to find overlapping work hours between Tehran and Tokyo. Amber rows mark daytime hours — pick a slot that falls in amber on both sides for a meeting that works for everyone.

Why Trust This IRST to JST Converter?

Timezoney uses the IANA Time Zone Database — the same source that powers your phone and computer — so every conversion handles daylight saving transitions and half-hour offsets automatically.