Time Difference: Tokyo to Jakarta

Summary

This tool displays the live current time in both Tokyo, Japan (JST, UTC+9) and Jakarta, Indonesia (WIB, UTC+7) simultaneously. The offset between the two cities is a fixed 2 hours — Tokyo is always 2 hours ahead of Jakarta because neither country observes Daylight Saving Time. All times are read from your device clock and update every second.

How it works

1. Your device clock is read via the JavaScript Date API.
2. Tokyo time is computed using the IANA timezone identifier Asia/Tokyo (always UTC+9, no DST).
3. Jakarta time is computed using Asia/Jakarta (WIB, always UTC+7, no DST).
4. The offset is calculated by comparing the UTC offsets of both timezones at the current moment.
5. The display updates every second so both clocks stay live and accurate.
6. A visual indicator shows whether both cities share the same calendar day.

Use cases

• Scheduling video calls between colleagues in Tokyo and Jakarta.
• Checking whether both cities are in business hours at the same time.
• Planning Japan-Indonesia travel connections and layovers.
• Tracking live events or broadcasts originating from either city.
• Remote teams coordinating across JST and WIB time zones.
• Investors monitoring Tokyo Stock Exchange and Indonesian IDX trading windows.
• Students or journalists following live news from Tokyo or Jakarta.
• Confirming that the 2-hour gap is constant year-round since neither city uses DST.

Frequently Asked Questions