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SPCXTools

Time Zone Converter

Convert any time between time zones and compare cities side by side — daylight saving included.

Runs locally — files never leave your device

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How to use Time Zone Converter

  1. 1Pick a date and time, and the time zone it belongs to (your own zone is selected by default).
  2. 2The list shows the same moment in every selected city, with its UTC offset and whether it falls on another day.
  3. 3Green dots mark normal working hours (8:00–18:00), amber is early morning or evening, grey is night.
  4. 4Add cities with Add a time zone, or remove them with ✕. Your list is remembered in this browser.

Convert time between time zones

Scheduling a call between San Francisco, London and Singapore, catching a live stream from another continent, or checking when a deadline "at 5 pm EST" falls for you — all need a reliable time zone conversion. Enter a date and time in any zone and this converter shows the same moment in every city on your list, with UTC offsets, day changes and a quick indicator of working hours. Daylight saving time is applied automatically for the exact date you choose.

Features

  • Any of the world's time zones, using the same IANA database as your operating system.
  • Side-by-side comparison of as many cities as you like.
  • Correct daylight saving for past and future dates.
  • Day indicators (+1 / −1) when a city is already on the next day or still on the previous one.
  • Working-hours dots to spot a meeting time that suits everyone.
  • Your list is remembered in this browser for next time.

Planning meetings across time zones

  1. Add every participant's city to the list.
  2. Change the time until as many dots as possible are green.
  3. Avoid times where someone is in the grey (night) band, and rotate inconvenient slots for recurring meetings so the same people aren't always disadvantaged.
  4. When you send the invitation, state the time with a city or UTC offset — for example "15:00 UTC" or "10:00 New York time" — rather than an ambiguous abbreviation.

Daylight saving pitfalls

Countries change their clocks on different dates, and many — including China, Japan, India and most of Africa — don't use daylight saving at all. The southern hemisphere shifts in the opposite season. As a result, the time difference between two cities can change by an hour for a few weeks each year. For example, New York and London are usually 5 hours apart, but for a short period in March and in late October/November they're only 4 hours apart. Always check the specific date of an event rather than relying on a fixed difference.

To convert a moment into a Unix timestamp, use the Unix Timestamp Converter. To count days between dates, try the Date Difference Calculator.

Frequently asked questions

Does the converter handle daylight saving time?
Yes. It uses your browser's built-in time zone database (IANA tz), so each city's offset is correct for the exact date you choose — including the weeks in spring and autumn when Europe and North America switch on different dates.
What is UTC?
Coordinated Universal Time (UTC) is the world's reference time, which does not change with seasons. Time zones are expressed as offsets from it, such as UTC−05:00 for New York in winter or UTC+09:00 for Tokyo. GMT is often used interchangeably with UTC.
Why do some zones have 30- or 45-minute offsets?
Several countries chose offsets that are not whole hours — India uses UTC+05:30, Nepal UTC+05:45 and parts of Australia UTC+09:30. The converter handles them exactly.
What does "+1" next to a date mean?
It means the time in that city falls on the next calendar day compared with the date you entered ("−1" means the previous day). This is common between Asia-Pacific and the Americas.
Why does the converter use city names rather than abbreviations like EST or CST?
Abbreviations are ambiguous — CST can mean Central Standard Time (US), China Standard Time or Cuba Standard Time — and they don't say whether daylight saving applies. City-based zones like America/Chicago are precise.

Related tools

Unix Timestamp ConverterConvert epoch timestamps to readable dates and dates to Unix time, with automatic seconds/milliseconds detection.Date Difference CalculatorCount the days between two dates — including business days — or add and subtract time from a date.Unit ConverterConvert between metric and imperial units across ten kinds of measurement, with all results at a glance.