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ZoneSync
Pick two time zones — see the local time in each side-by-side, with daylight saving handled.
Aim for an overlap window where both sides are in their standard work hours. The closer your zones are, the easier — but for far-apart pairs (e.g., US ↔ Asia), rotate who takes the awkward time.
Duration between two times of day, in hours and minutes.
OpenHours worked from clock-in, clock-out, and break time.
OpenWeekly total hours and overtime from daily entries.
OpenAnnual cost of your daily commute.
OpenUTC−04:00
Wed, Jul 22
UTC+09:00
10:00 PM
Wed, Jul 22
What you entered
America/New York offset from UTC
IANA time zone database lookup= UTC−04:00Asia/Tokyo offset from UTC
IANA time zone database lookup= UTC+09:00Difference between the two zones
(UTC+09:00) − (UTC−04:00)= +13hApply the difference to the source time
09:00 + 13 hours= 10:00 PMResult
Time in Asia/Tokyo: 10:00 PM
09:00 in America/New York is 10:00 PM in Asia/Tokyo — a difference of 13 hours ahead.