Time Zone Converter - Compare Two Time Zones by Date & Time
Enter a date and time in one time zone and see the equivalent moment in another. Choose from common US, European, and Asian zones and view the hour difference between them.
Date & Time
Enter a local date and time in the source time zone.
Converted Time
Same moment in both zones.
London
3:27 PM
Tue, Aug 18, 2026 · UTC+1
Tue, Aug 18, 2026
Methodology and limitations
Last reviewed:
Methodology
Interprets wall-clock time in the source IANA zone, converts via UTC offset for the entered date, and formats in the target zone using Intl APIs.
Limitations
Results depend on browser timezone data. Historical rule changes before modern DST may differ.
How Time Zone Conversion Works
Enter a date and time in one time zone and see the equivalent moment in another. Choose from common US, European, and Asian zones and view the hour difference between them.
Method used
The calculator interprets the entered wall-clock time in the source IANA time zone, converts through UTC for the selected date (accounting for DST rules), and formats the equivalent time in the target zone.
Target time = source local time adjusted by UTC offset difference on the selected date
Practical example
10:00 AM in America/New_York on a summer date might convert to 7:00 AM in America/Los_Angeles when Pacific Daylight Time is three hours behind Eastern.
- Date and time in 24-hour format
- Source IANA time zone
- Target IANA time zone
The result shows the converted date and time in the target zone with zone labels.
Assumptions
- IANA time zone database rules apply for DST transitions.
- Wall-clock times are entered without fractional seconds.
- Historical DST rules before modern adoption may differ in edge cases.
What this includes
- Major global time zones, DST-aware conversion, and formatted output in target zone.
What this excludes
- Meeting scheduler invites, airline UTC logbook rules, legal timestamp certification, and fractional time-zone offsets used in a few regions.
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Frequently Asked Questions
How does the time zone converter work?
Enter a local date and time in the source zone. The tool interprets that wall-clock time, converts through UTC internally, and displays the matching date and time in the target zone with each zone’s offset. Use it for meeting invites, flight connections, and release schedules spanning continents.
Does this handle daylight saving time?
Yes. The calculator uses IANA time zone identifiers such as America/New_York and the browser’s Intl API, which applies daylight saving rules for the specific date you enter. That means a January meeting and a July meeting can show different hour gaps even for the same city pair.
Which time zones are available?
Common zones across the US, Canada, Latin America, Europe, Asia, Australia, and UTC appear in the list. Select any two to compare local times and the hour difference. If your exact city is missing, choose the IANA zone that shares its civil time rules.
Can I convert the current time?
Yes. Click Use current time to fill the date and time fields with now, then pick source and target zones to see what time it is elsewhere right now. Refresh if you keep the page open across a clock change. Ideal for “what time is it for them?” checks before calling.
Why might my result differ from a manual offset calculation?
Manual fixed offsets ignore daylight saving transitions and historical rule changes. This tool applies official zone rules for the date entered, which is more accurate across seasons and regions. Always verify critical legal or aviation times against an authoritative schedule when stakes are high.