SeoulSouth Korea
23:23
Tue, Aug 25, 2026Same day
052 · DATE & TIME
World Time & Time Zone Converter
Compare local times across cities, convert UTC and time zones, and find common meeting times.
LOCALTIME ZONES IN YOUR BROWSER
LOCALCity and time inputs are calculated only in your browser and are not sent to a server.Time zone data baseline: 2026c
WORLD TIME WORKSPACE
Reference time
Add city4/12
COMPARE
City comparison
New YorkUnited States
10:23
Tue, Aug 25, 2026Same day
LondonUnited Kingdom
15:23
Tue, Aug 25, 2026Same day
TokyoJapan
23:23
Tue, Aug 25, 2026Same day
HOW TO USE
How to use
- 01
Choose the current instant or a specified date and time.
- 02
Choose a reference city or UTC.
- 03
Search for and add comparison cities.
- 04
Review local time, date, UTC offset, and DST status for every city.
- 05
Open Common Meeting Time to find intervals that fall inside every city’s working hours.
TIME ZONE GUIDE
How to compare world time accurately
Keep one instant fixed in UTC and project it through IANA time-zone rules so DST and date boundaries remain explicit.Use regional time-zone IDs
The tool uses IDs such as Asia/Seoul and America/New_York instead of treating a fixed UTC offset as a region.
Apply DST for the selected date
A city can have different UTC offsets across the year, so the offset is calculated at the selected instant.
Show date boundaries with the time
The same instant may be the previous or next calendar day in another city.
Preserve 30- and 45-minute offsets
India, Nepal, Eucla, Chatham and other non-integer offsets are kept to the minute.
Intersect every working-hour window
Each city starts at 09:00–18:00 by default and can be edited before the common interval is calculated.
IMPORTANT NOTES
Important notes
- Time-zone rules can change after government decisions and browser time-zone data updates.
- A nonexistent local time during a DST jump is never silently corrected. A repeated local time during fall-back requires an explicit choice.
- A numeric offset such as UTC+9 is not used as the identity of a region.
- Meeting results are convenience calculations based on the working hours you enter, not official workplace rules or legal time certification.
- For legal, contractual, or flight-operation decisions, confirm the relevant official source.
FAQ
Frequently asked questions
01Why can the time difference change by season?+
Regional clock-change rules such as DST can change a city’s offset on different dates.
02Are UTC and a time zone the same thing?+
No. UTC is a time reference; a time zone defines regional local-time rules.
03Can I compare several cities at once?+
Yes. You can compare up to 12 selected cities at the same instant.
04Can it find meeting times?+
Yes. It finds intervals where all selected cities are inside their configured working hours.
05Is DST applied automatically?+
Yes. Browser Intl applies IANA time-zone rules for the selected date and the tool calculates the corresponding UTC offset and DST state.
06Are my city and time inputs uploaded?+
No. Core calculations run locally in the current browser.