1
Pick From and To
Search by city or country. IANA zones handle daylight saving time for the current date.
Time zone planner
Search cities, compare offsets, and find overlapping office hours (9:00–17:59 local).
Green = both locations in typical office hours (9:00–17:59 local) on the same calendar day in "From".
00:0006:0012:0018:0023:00
Building global apps?
Let Tomris Medya handle your technical infrastructure—integrations, hosting, and reliable delivery worldwide.
Pro Tip
Meeting overlap uses 9:00–17:59 local time in each city. Public holidays and company-specific schedules are not included—confirm critical calls on official calendars.
How to Use the Timezone Converter
2
Read offset and clocks
See whether the destination is ahead or behind, with live digital clocks for both locations.
3
Use Meeting planner
The 24-hour strip highlights hours where 9–5 office hours overlap in both zones (same calendar day in the From location).
Understanding Timezones
Earth uses many official time zones (often aligned with political boundaries, not only longitude). UTC is the universal reference; each IANA zone name (for example Europe/Istanbul) maps to rules for standard time and DST.
This tool compares offsets using your browser’s Intl data. The vertical thermometer shows how far through the 24-hour day you are in the From zone; the green segments show which starting hours that day allow both sides to be in typical business hours.
Frequently Asked Questions
It compares the two zones’ offsets from UTC at the same instant. If Tokyo is ahead of New York, noon in New York corresponds to a later calendar time in Tokyo.
UTC (Coordinated Universal Time) is the global time standard. Local zones are expressed as offsets from UTC; IANA names bundle those rules including DST.
They keep local civil time roughly aligned with the sun’s position so noon stays in daylight. Political choices and DST add complexity beyond simple longitude bands.