Timezone Converter & World Clock
Live world clocks and timezone conversion using the Intl API. No external dependencies.
World Clock
Time Converter
Timezone converter online: convert any time between world timezones with DST support
Scheduling across timezones is one of the most common sources of confusion in global teams and distributed work. This tool lets you convert any date and time between any two IANA-named timezones instantly, with full daylight saving time awareness. Whether you are booking a meeting with a colleague in Tokyo, setting a server cron job in UTC, or checking when a live event starts in your local time, this converter has you covered.
The tool uses the browser's built-in Intl API backed by the IANA timezone database, which means it reflects all current DST transition rules without any external API calls. Your conversions are instant, private, and always up to date.
Step-by-step guide
- 1Select the source timezone
Search or scroll to pick the timezone you are converting from: for example, America/New_York or Europe/London. - 2Enter a date and time
Type or pick the specific date and time you want to convert. The current local time is pre-filled as a starting point. - 3Select the target timezone
Pick the destination timezone to see what the equivalent local time is there, including the UTC offset and DST status. - 4View the converted time
The converted time appears instantly along with the UTC offset for each zone and whether daylight saving time is currently active. - 5Copy or share
Copy the result to your clipboard to include in a meeting invite, email, or scheduling message.
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Frequently Asked Questions
- How many timezones does this tool support?
- The tool uses the IANA timezone database (the same database used by all major operating systems) which covers hundreds of named timezones worldwide, including historical DST transitions.
- What is a UTC offset?
- UTC (Coordinated Universal Time) is the global time standard. A UTC offset expresses how far ahead or behind a timezone is relative to UTC: for example, UTC+5:30 for India or UTC-8 for US Pacific Standard Time.
- Does the converter account for daylight saving time?
- Yes. The IANA timezone database includes full DST rules for every applicable timezone. The tool automatically applies the correct offset based on the date you select.
- What is the difference between a timezone and a UTC offset?
- A UTC offset is a fixed number like +05:30. A timezone is a named region (e.g. America/Chicago) that has defined rules about when and how the UTC offset changes due to daylight saving time.
- Why do some countries have half-hour or quarter-hour offsets?
- Historically some countries chose offsets aligned with their geographic meridians rather than whole hours. India (UTC+5:30), Nepal (UTC+5:45), and Iran (UTC+3:30) are examples.
- Can I convert a past or future date?
- Yes. Select any date in the past or future and the tool will apply the correct UTC offset and DST rules that apply on that specific date.
- Is this tool free?
- Yes, completely free with no account, no sign-up, and no usage limits.
- Does this tool store any data?
- No. All conversion is done in your browser using the JavaScript Intl API and IANA timezone data. Nothing is sent to a server.
AlteredIdea vs alternatives
vs server-side converters: AlteredIdea converts in your browser: your data never leaves your device.
vs writing scripts: Instant results, no coding needed.
vs paid tools: Completely free, no account required.