Time Zone Converter
Convert a time across IANA time zones using built-in Intl.DateTimeFormat
About this calculator
The Time Zone Converter takes a date and wall-clock time in one IANA time zone and shows the same instant across any set of target zones, using the browser's built-in Intl.DateTimeFormat database. Each result includes a formatted local date and time plus the UTC offset, with daylight-saving rules applied automatically for the chosen date. Invalid dates, times, or zone names return clear errors. Ideal for scheduling meetings across regions.
How to use the Time Zone Converter calculator
- Enter your values into the input fields.
- Read the result — it updates instantly as you type.
- Adjust the inputs to compare scenarios.
- Copy the page URL to share the exact calculation.
Common examples
- Jun 15, 2025 9:00 AM New York → London 2:00 PM (+01:00), Tokyo 10:00 PM (+09:00)
- Jan 15, 2025 5:00 PM Los Angeles → UTC Thu 1:00 AM, Kolkata 6:30 AM (+05:30, next day)
- Mar 10, 2025 12:00 Paris → Sydney 10:00 PM same day (+11:00)
Frequently asked questions
How does the Time Zone Converter calculator work?
Enter your numbers and the calculator applies the standard formula for this everyday task, showing the result and how it was reached. It handles the unit and rounding details so you do not have to.
When would I use the Time Zone Converter calculator?
Whenever this comes up in daily life — planning, shopping, home projects, travel or work — and you want a quick, dependable answer instead of estimating or working it out by hand.
How accurate are the results?
The math runs at full precision internally and only the displayed value is rounded for readability. For real-world use the practical limit is the accuracy of the numbers you enter, not the calculation.
Can I share a specific calculation with someone else?
Yes. Every value you enter updates the URL, so copying the address bar and sharing the link reopens the exact same calculation for whoever clicks it.