Time Zone Converter
Convert a date and time from one time zone into one or more others, with day-rollover badges when the result lands on a different calendar date.
🔒 Processed locally in your browser
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How to use
- Pick a date and time in the "Date and time" field, or click "Now" to fill in the current moment.
- Choose the time zone that date and time is in using the "From time zone" dropdown.
- Pick one or more destination time zones under "Convert to" — use "+ Add time zone" to compare more at once.
- Each row shows the converted local time, its current UTC offset, and a badge if it falls on the previous or next calendar day.
Features
- Converts any date and time between any two or more IANA time zones
- Compare against multiple destination time zones at once
- Flags when a converted time lands on a different calendar day
- Shows each zone's current UTC offset, correctly handling daylight saving time
- 100% client-side — powered entirely by your browser's built-in time zone data
Frequently asked questions
How accurate is this converter?
It uses your browser's built-in IANA time zone database via the JavaScript Intl API — the same data source operating systems and most software rely on, including historical and scheduled future daylight saving time rules.
What does the +1d / -1d badge mean?
It means the converted time falls on a different calendar date than the date you entered. "+1d" means one day later in that time zone, and "-1d" means one day earlier.
Does it account for daylight saving time?
Yes. Because the conversion is calculated for the exact date you enter, it automatically applies whatever daylight saving rules were or will be in effect for each zone on that date.
Can I compare more than two time zones at once?
Yes. Click "+ Add time zone" to add more destination zones, up to six at a time, and remove any of them with the ✕ button next to its dropdown.
Is my date and time sent anywhere?
No. All conversions run locally in your browser using its built-in Intl API — nothing you enter is ever sent to a server.