JST to GMT Time Converter

JST refers to the Asia/Tokyo timezone, currently ++9 (GMT+9). 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: Tokyo (Japan) for JST and London (United Kingdom) for GMT.

Key Facts

• JST (Asia/Tokyo): current live offset ++9.
• 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.