IST to GMT Time Converter

IST refers to the Asia/Kolkata timezone, currently ++5:30 (GMT+5:30). GMT refers to Europe/London, currently ++1 (GMT+1). 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 London (United Kingdom) for GMT.

Key Facts

• IST (Asia/Kolkata): current live offset ++5:30.
• GMT (Europe/London): current live offset ++1.
• Time difference is computed from live IANA tzdb offsets and may shift by one hour during DST transitions.