JST to IST Time Converter

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

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

Key Facts

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