Date and time
Time zone converter
Convert date-times between time zones with daylight-saving rules.
Your numbers
Both a decimal point and a comma work.
Result
2026-01-15 21:00 · Asia/Tokyo
Time in target zone
- Instant in UTC
- 2026-01-15T12:00Z
How it works
Local time → UTC instant → target time zone
Using the calculator
Enter: Date and time in source zone · Source time zone · Target time zone · If the local time occurs twice. Calculation: Local time → UTC instant → target time zone.
Worked input and result
Example: Date and time in source zone = 2026-06-15T12:00; Source time zone = Europe/London; Target time zone = Asia/Tokyo; If the local time occurs twice = Earlier occurrence. Result: Time in target zone = 2026-06-15 20:00 · Asia/Tokyo (Instant in UTC: 2026-06-15T11:00Z).
Understanding the result
Uses the browser’s time zone database. A skipped local time is rejected; for repeated times you can choose the earlier or later occurrence. Future rules depend on the browser’s database being up to date.
Time-zone offsets can change with daylight-saving rules and the selected date. When a local hour occurs twice, choose which occurrence is intended; some local times do not exist during the spring transition.