IST to JST Time Converter
Japan Standard Time (JST) is currently 3 hours 30 minutes ahead of India Standard Time (IST). IST is UTC+5:30 and JST is UTC+9. The table below converts every hour of the day between the two, and the call planner shows where working hours line up.
Best Time for a Call
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 1:30 PM in IST, which is 12:30 PM to 5:00 PM in JST.
Comparing more than two places? The Overlap Zones tool shows working hours for several cities on one grid.
Hour by Hour: IST to JST
Rows marked office hours fall between 9:00 AM and 5:00 PM in both places. For a specific date, use the interactive converter.
Does the Difference Change During the Year?
IST and JST are fixed offsets, so the difference between them never changes.
This page covers India Standard Time, UTC+5:30, which has no daylight saving. IST can also refer to Irish Standard Time (UTC+1) or Israel Standard Time (UTC+2).
JST is UTC+9. Japan has no daylight saving, so this offset never changes.
Frequently Asked Questions
How many hours ahead is JST compared to IST?
JST is currently 3 hours 30 minutes ahead of IST. IST and JST are fixed offsets, so the difference between them never changes.
What time is 9:00 AM in IST in JST?
9:00 AM in IST is 12:30 PM in JST.
What is the best time for a call between IST and JST?
Both sides are inside 9:00 AM to 5:00 PM office hours between 9:00 AM and 1:30 PM in IST, which is 12:30 PM to 5:00 PM in JST.