Time Zones

Time Zones is a free, browser-based converter that turns a time in one place into the matching local time in others. Pick a source city or zone, set a date and time, add the cities you care about, and the tool lines up the equivalent times side by side.

Under the hood it uses the same IANA time zone database your operating system relies on, so it applies the correct offset for each region - including daylight saving time transitions - rather than a fixed number of hours. That matters because the gap between two cities can change by an hour depending on the date.

Everything happens on this page. The dates, zones and times you enter never leave your device, so there is nothing to upload and nothing logged. The converter keeps working even when you are offline.

Doing time zone math in your head is a reliable way to book a call at undefined a.m. someone else's time. You have to remember each region's offset from UTC, whether it currently observes daylight saving, and whether the conversion crosses midnight into the previous or next day. Get any one of those wrong and the meeting invite is an hour or a day off.

An online converter removes that guesswork. It knows every zone's current rules, handles the twice-a-year daylight saving shifts automatically, and rolls the date forward or back when a conversion crosses midnight. You see the answer immediately instead of counting on your fingers.

The usual concern with web tools is privacy - meeting details and travel plans can be sensitive. Dev Nexus keeps them private: the conversion runs entirely in your browser using the built-in Intl date APIs. Nothing is sent to a server, so it is safe for work schedules, personal plans or anything else.

Start by choosing the source zone - the place the original time is in - and entering the date and time. For example, a call scheduled for 09:00 in New York.

Next, add the target zones you need. Add London, Berlin, Bangalore, Tokyo or wherever your colleagues, clients or family are, and each one shows the equivalent local time next to the source. The 09:00 New York call becomes 14:00 in London and 18:30 in Mumbai, with the correct date shown when the conversion crosses midnight.

Because the tool follows real calendar rules, offsets that shift with daylight saving are handled for you. If you are converting a Unix timestamp rather than a wall-clock time, the Timestamp Converter is the better-fitted companion, and it pairs naturally with this tool.

Lining up times across regions comes up constantly:

• Scheduling meetings: find a time that works for teammates or clients in different countries.
• Booking calls with family or friends abroad: avoid ringing someone in the middle of their night.
• Travel planning: work out arrival times, layovers and jet-lag windows in local time.
• Watching live events: convert a broadcast, launch or match start time to your own zone.
• Coordinating deadlines: confirm exactly when a cut-off lands when it is quoted in another zone.
• Remote work: check when a distributed team's working hours overlap.

When you need to measure a span of days between two dates instead of comparing zones, the Age Calculator handles date math cleanly.

A few pointers for accurate, unambiguous results:

• Always name the zone, not just the offset. "undefined p.m. UTC+undefined" is clearer than "undefined p.m. my time", and the tool tracks the offset changes for you.
• Mind daylight saving dates. The gap between two cities can change by an hour around DST transitions, and the switch dates differ by country - the converter applies each region's current rules.
• Watch the date, not just the clock. Conversions across the Pacific often land on the previous or next calendar day; check the date the tool shows, not only the time.
• Prefer a specific city over a broad abbreviation. Labels like "CST" are ambiguous - pick an actual city or IANA zone so there is no doubt which region you mean.
• Recheck around travel and rule changes. Countries occasionally change their time zone rules; converting fresh each time keeps you on the current offset.