Time Zone Converter
Convert times across multiple time zones
About the Time Zone Converter
Scheduling across time zones without getting it wrong requires knowing both the current offset and whether each city is observing daylight saving time right now. A fixed UTC offset is not enough — New York shifts from UTC−5 to UTC−4 in March, and Sydney does the opposite in April. This converter uses your browser's built-in time-zone database (via the Intl.DateTimeFormat API), so the offsets it shows are always correct for the specific date you pick.
Remote engineering teams use it to find a stand-up time that works from San Francisco to Berlin to Singapore. Event organizers post a livestream time and then verify it in half a dozen attendee cities. Travelers confirm what time their connecting flight boards in local time. Freelancers working with international clients know at a glance whether their counterpart is reachable or asleep. You can add up to eight comparison time zones simultaneously and switch between 12-hour and 24-hour display to match what the other person expects to see.
How to Use the Time Zone Converter
- Set the base date and time using the date/time picker — it defaults to right now.
- Choose the base time zone (the one your time is already in) from the dropdown.
- The preset comparison zones appear below. Click Add Zone to add more, or the × button on any card to remove one.
- Toggle 12hr / 24hr to match your preference. Each card shows the local time, date, and UTC offset for that zone.
Why Use ToolForge’s Time Zone Converter
- Uses the browser's native Intl.DateTimeFormat time-zone database — daylight saving transitions are handled automatically, with no manual offset table to maintain.
- Supports up to eight comparison zones simultaneously, so a single view covers an entire distributed team.
- A curated list of nineteen commonly needed IANA zones (from UTC to Pacific/Auckland) covers the major world cities without overwhelming you with hundreds of choices.
- Works entirely client-side — no API call is needed, so it works offline once the page has loaded.
Frequently Asked Questions
Does this handle daylight saving time correctly?
Yes. It uses the Intl.DateTimeFormat API backed by your browser's IANA time-zone database, which encodes every region's daylight-saving rules. If you pick a date in January for New York, you get EST (UTC−5); pick a date in July and you get EDT (UTC−4) automatically.
What is the difference between EST and EDT?
EST (Eastern Standard Time) is UTC−5 and applies during winter. EDT (Eastern Daylight Time) is UTC−4 and applies during summer when daylight saving is in effect. The same applies to other time zones — PST/PDT for the US West Coast, BST/GMT for the UK, and so on.
Why use IANA timezone names instead of offsets like UTC+5:30?
Fixed offsets become wrong when daylight saving kicks in. IANA names like "Asia/Kolkata" encode the full history of rules for a region, including exactly when clocks change. A named zone is always correct; a fixed offset is only correct for part of the year in many regions.
Can I convert a specific meeting time rather than the current time?
Yes — change the date and time in the base picker to any date and time you like. The comparison cards update immediately, giving you the correct local time for that specific moment in each zone.
