IST to JST Time Converter

IST refers to the Asia/Kolkata timezone, currently ++5:30 (GMT+5:30). JST refers to Asia/Tokyo, currently ++9 (GMT+9). Timezone abbreviation meanings and offsets are calculated live from the IANA tz database, so Daylight Saving Time is always applied correctly.

Representative cities: Delhi (India) for IST and Tokyo (Japan) for JST.

Key Facts

• IST (Asia/Kolkata): current live offset ++5:30.
• JST (Asia/Tokyo): current live offset ++9.
• Time difference is computed from live IANA tzdb offsets and may shift by one hour during DST transitions.