JST to IST — Time Zone Converter
Japan Standard Time (JST, UTC+9) covers Japan; India Standard Time (IST, UTC+5:30) covers India. In standard time, IST is 3½ hours behind JST. 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.
JST to IST, hour by hour (today)
Frequently asked questions
What is the time difference between JST and IST?+
Japan Standard Time (JST) is UTC+9 and India Standard Time (IST) is UTC+5:30, so in standard time IST is 3½ hours behind JST. Neither zone observes daylight saving time, so this difference is the same all year.
Does JST or IST observe daylight saving time?+
Japan Standard Time stays on UTC+9 all year — no daylight saving time. India Standard Time stays on UTC+5:30 all year — no daylight saving time.
What is the best time for a meeting between JST and IST?+
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 JST to IST 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 JST and IST times spelled out so nobody has to do the math.