IST to JST — Time Zone Converter
India Standard Time (IST, UTC+5:30) covers India; Japan Standard Time (JST, UTC+9) covers Japan. In standard time, JST is 3½ hours ahead of IST. Mornings in India overlap with afternoons in Japan, which keeps both sides inside office hours. Use the live converter below — it applies today's IANA time zone data, including daylight saving time, and gives you a meeting schedule you can paste straight into email or Slack.
IST to JST, hour by hour (today)
Frequently asked questions
What is the time difference between IST and JST?+
India Standard Time (IST) is UTC+5:30 and Japan Standard Time (JST) is UTC+9, so in standard time JST is 3½ hours ahead of IST. Neither zone observes daylight saving time, so this difference is the same all year.
Does IST or JST observe daylight saving time?+
India Standard Time stays on UTC+5:30 all year — no daylight saving time. Japan Standard Time stays on UTC+9 all year — no daylight saving time.
What is the best time for a meeting between IST and JST?+
Mornings in India overlap with afternoons in Japan, which keeps both sides inside office hours. The converter above highlights office hours in green for both zones, so you can slide to a time that works for everyone.
How do I share a IST to JST meeting time by email?+
Pick a time in the converter, log it to the Smart Clipboard, and copy it as bullets, a formatted table, or a one-line question — with both IST and JST times spelled out so nobody has to do the math.