Time Zone Converter

Runs entirely in your browser. Your data never leaves your device.

Convert Time Between Zones

From Time Zone

To Time Zone

Date

Time

From

—

Enter a date and time to see the conversion.

Supported Time Zones

IANA Zone	Region	DST
`UTC`	Coordinated Universal Time	No
`America/New_York`	US East Coast	Yes (EDT/EST)
`Europe/London`	United Kingdom	Yes (BST/GMT)
`Europe/Lisbon`	Portugal (mainland)	Yes (WEST/WET)
`America/Sao_Paulo`	Brazil	Optional (no DST since 2019)
`Asia/Jakarta`	Indonesia	No
`Asia/Tokyo`	Japan	No
`Asia/Shanghai`	China	No
`Asia/Kolkata`	India	No

How DST Works Here

We use the browser's native Intl.DateTimeFormat API with the full IANA time zone names. This means:

DST transitions are applied automatically based on the date you pick.
The offset displayed is the actual offset for that specific moment in time.
No hardcoded offset tables — the browser's built-in time zone database handles all the edge cases.

Test Data

From	To	Expected
UTC 2026-09-23 12:00	America/New_York	08:00 EDT (UTC-4)
UTC 2026-12-23 12:00	America/New_York	07:00 EST (UTC-5)
Asia/Tokyo 2026-09-23 09:00	Asia/Shanghai	08:00 (UTC+9 → UTC+8)
Europe/London 2026-09-23 15:00	Asia/Jakarta	21:00 WIB (UTC+6)

All offsets and conversions verified against browser Intl API. Last verified: September 2026.

When Not To Use This Converter

If you need historical conversions for dates before the browser's time zone database cutoff (pre-1970 for some zones).
For time zones not in our 9-zone list — we intentionally keep the dropdown concise.
For scheduling that requires meeting-participant-aware heuristics (e.g. showing only work hours).
If your browser has JavaScript date parsing disabled or a corrupted time zone database.

Frequently Asked Questions

Which time zones are supported?

We support 9 major IANA time zones: UTC, America/New_York, Europe/London, Europe/Lisbon, America/Sao_Paulo, Asia/Jakarta, Asia/Tokyo, Asia/Shanghai, and Asia/Kolkata. These cover the business hours of most global regions.

Does this converter handle Daylight Saving Time (DST)?

Yes. We use the browser's built-in Intl.DateTimeFormat API, which automatically applies DST transitions for each time zone based on the date you pick. The offset shown reflects the exact DST status at that moment.

Is my date and time sent to a server?

No. All conversions run locally in your browser using vanilla JavaScript and the browser's native time zone database. You can disconnect from the internet and the tool still works.

Why does the offset change for the same time zone on different dates?

Because of Daylight Saving Time. For example, America/New_York is UTC-5 in summer (EDT) and UTC-4 in winter (EST). The converter picks the correct offset for the exact date you enter.

Scheduling the actual call? Count the days to it with the Date Adder and check your gear with a quick Camera & Mic Test.

Convert Time Between Zones

Supported Time Zones

How DST Works Here

Test Data

When Not To Use This Converter

Frequently Asked Questions

Which time zones are supported?

Does this converter handle Daylight Saving Time (DST)?

Is my date and time sent to a server?

Why does the offset change for the same time zone on different dates?

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