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DevUtil

Timezone Converter - Convert Times Between Timezones

UTC+00:00
UTC-05:00

About the Timezone Converter

Working across timezones is routine for distributed teams. Scheduling a meeting between London and San Francisco, checking when a deploy window opens in Singapore, or figuring out what time a US-Eastern cron job fires in your local timezone all require quick, accurate conversion.

This converter uses the browser's built-in Intl API, which means it always has up-to-date timezone rules including daylight saving changes. Pick your source and target timezones, enter a date and time, and see the converted result along with UTC offsets and the hour difference between the two zones.

How to Use

Enter or pick a date and time, select the timezone it is currently in, then select the timezone you want to convert to. Use the preset buttons above each dropdown to quickly select common timezones. The swap button reverses the two timezones. Click "Now" to fill in the current date and time.

Features

  • 400+ timezones. Every IANA timezone your browser supports, with quick-select presets for the most common ones.
  • Daylight saving aware. Offsets update based on the selected date, so summer and winter times are handled correctly.
  • UTC offset display. See the UTC offset for both timezones alongside the converted time.
  • Time difference. A badge shows the relative hour difference between the two zones.
  • Client-side only. No data leaves your browser.

Frequently Asked Questions

How does the timezone converter work?
Select a source timezone and a target timezone, enter a date and time, and the tool converts it using the Intl API built into your browser. It accounts for daylight saving time automatically because it reads the current offset rules for each IANA timezone.
Does it handle daylight saving time?
Yes. The converter uses the Intl.DateTimeFormat API, which applies the correct UTC offset for the given date. If a timezone observes summer time, the offset shifts accordingly.
What timezones are supported?
Every IANA timezone supported by your browser. Modern browsers include over 400 timezones. Common presets (UTC, US Eastern, London, Tokyo, Sydney, etc.) are shown as quick-select buttons above the dropdowns.
How is the time difference calculated?
The tool calculates the UTC offset for both timezones at the selected date and subtracts one from the other. The result is displayed as a relative difference (e.g. +5h or -3.5h).