IST to JST Converter

It takes three quick steps:

1. Click the IST field on the left and pick the time you want to convert.
2. The matching JST time updates on the right automatically — there’s no button to press.
3. Need a different day? Click the date field and the result follows, rolling over if it crosses midnight.

JST is 3 hours and 30 minutes ahead of IST. In everyday terms, once you know the time on one side you just add 3 hours 30 min to get the other — so a call between Mumbai and Tokyo is always 3 hours 30 min apart.

Right now the time in Japan Standard Time (JST) is Tuesday, June 30, 2026 · 2:54:01 AM. It ticks every second, so you’re always looking at the live JST clock.

And in India Standard Time (IST), it’s currently Monday, June 29, 2026 · 11:24:01 PM. Compare the two and the 3 hours 30 min gap is easy to see.

For example, a 9:00 AM IST meeting takes place at 12:30 PM JST. The trick is to aim for a slot that lands inside normal working hours on both sides. Once you’ve found a time, hit Share on the converter to copy a link with the time built in — easy to send to a colleague. Juggling three or more zones? The meeting planner highlights the hours that overlap for everyone.

The labels IST and JST are fixed offsets, so the result on this page is always exact. Neither side changes its clocks for daylight saving, so the difference you see here is the same in summer and winter.

Every conversion here is calculated from the IANA time zone database — the same source your phone, computer, and browser rely on. Plenty of tools hard-code a single offset, which quietly goes wrong whenever a region changes its rules or flips for daylight saving. We follow the real rules instead, so IST to JST stays accurate for today and for any past or future date you type in.