IST to JST converter
India Standard Time → Japan Standard Time
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India Standard Time (IST) is UTC+5:30 with no daylight saving. It covers Mumbai, Delhi, Bengaluru and Chennai.
Japan Standard Time (JST) is UTC+9 with no daylight saving. It covers Tokyo, Osaka and Sapporo (Seoul shares the same clock).
Japan Standard Time is typically 3½ hours ahead of India Standard Time, all year round — neither zone observes daylight saving.
Best time to call Japan Standard Time from India Standard Time
Office hours overlap for about 4.5 hours a day: 9:00 AM–1:30 PM in India Standard Time is 12:30 PM–5:00 PM in Japan Standard Time. Book calls inside this window and nobody is out of hours.
IST to JST, hour by hour
Today's actual offsets. Rows where both zones are inside 9am–5pm working hours are highlighted.