Convert a date and local time between the cities listed in the tool, then compare that same moment across the world-clock cards. Always choose the date as well as the time because daylight-saving rules can change the offset.
Time Zone Converter
Convert any date and time from one time zone to another, with automatic daylight-saving handling — plus a world clock showing that exact moment across major cities.
🌐 World clock at that moment
Note: Conversions use official IANA time-zone data, so daylight-saving shifts are applied automatically for the date you choose. Historical or far-future dates near a DST change may vary by region.
Convert a meeting time
- Enter the date and time shown on the original invitation.
- Select the invitation’s city under From time zone.
- Select the city whose local time you need under To time zone.
- Select Convert Time. Check the result’s full date, not only the hour.
The world-clock cards show the same instant in several cities. They are not separate live clocks or a calculation of travel duration.
Why the meeting date changes the result
New York uses different UTC offsets in winter and summer under its 2026 rules. Karachi remains at UTC+05:00. The same New York wall-clock time therefore maps to different Karachi times:
| New York time | UTC | Karachi |
|---|---|---|
| 15 January 2026, 15:00 | 15 January, 20:00 | 16 January, 01:00 |
| 15 July 2026, 15:00 | 15 July, 19:00 | 16 July, 00:00 |
This is why a recurring meeting should be stored with its city time zone in a calendar, rather than copied as a fixed number of hours for the entire year.
City names are more useful than ambiguous abbreviations
The tool uses IANA identifiers such as America/New_York and Asia/Karachi. A city identifier describes a set of rules over time. An offset such as UTC−05:00 describes one offset, and an abbreviation such as CST can be ambiguous across countries.
IANA’s Time Zone Database records changes to local time rules. This calculator formats times using your browser’s time-zone data; it does not independently verify a future event with its organiser. Keep your browser and operating system updated, and reconfirm events if governments change local rules.
Clock changes can create a missing or repeated hour
When a clock moves forward, some local times never occur. When it moves backward, a local time can occur twice. The calculator flags a missing local time and shows both possible conversions for a repeated time.
For example, 02:30 in New York on 8 March 2026 does not occur. The local time 01:30 on 1 November 2026 occurs twice, once before and once after the offset change. For a meeting in that interval, get the organiser’s UTC time or an invitation with an explicit offset instead of guessing which occurrence is intended.
Time-zone conversion versus journey duration
Converting a departure time tells you the simultaneous local time elsewhere. To find the duration of a journey, you also need the arrival date and local time, convert both endpoints to the same zone and subtract. A next-day arrival can still follow a short flight, while crossing a date boundary can make a long journey appear short on the calendar.
For calendar-day differences, use the Date Difference Calculator. To count down after checking your own local event time, use the Countdown Timer.