sprytools

Time Zone Converter

Convert times between any two time zones — DST-aware, 100% client-side. Supports UTC, Berlin, London, New York, Los Angeles, Tokyo, Sydney and all IANA time zones. Free world clock and meeting planner.

Did we solve your problem today?

Time Zone Converter

Convert times between any two time zones — Daylight Saving Time (DST) aware and 100% free.

How to use this tool

  1. Click Now to fill the current date and time, or enter a custom date and time manually.
  2. Select the source time zone — the time zone your input belongs to.
  3. Choose the target time zones using the preset chips (Berlin, New York, Tokyo, etc.) or add any time zone from the dropdown.
  4. Toggle 12h / 24h to switch display formats.
  5. Enable Meeting planner to highlight time slots where all selected zones are simultaneously within business hours (09:00–17:00).
CityStandard offsetDaylight Saving offset
UTCUTC+0—
LondonUTC+0 (GMT)UTC+1 (BST)
Berlin / ParisUTC+1 (CET)UTC+2 (CEST)
MoscowUTC+3— (no DST)
DubaiUTC+4— (no DST)
MumbaiUTC+5:30— (no DST)
Singapore / ShanghaiUTC+8— (no DST)
TokyoUTC+9 (JST)— (no DST)
SydneyUTC+10 (AEST)UTC+11 (AEDT)
New YorkUTC-5 (EST)UTC-4 (EDT)
Los AngelesUTC-8 (PST)UTC-7 (PDT)

About Daylight Saving Time

Most countries in Europe advance clocks by one hour on the last Sunday of March and revert on the last Sunday of October. The United States follows a slightly different schedule: DST begins on the second Sunday of March and ends on the first Sunday of November. Countries near the equator (Japan, Singapore, UAE, India) do not observe DST.

This tool uses the browser’s native Intl.DateTimeFormat API with IANA time zone data to apply the exact DST rules for every time zone — no npm package required.

Meeting planner tips

Finding a good meeting time across multiple continents is challenging. A few rules of thumb:

FAQ

What is a time zone and why does it matter?

A time zone is a region that observes a uniform standard time. They are measured as offsets from Coordinated Universal Time (UTC), ranging from UTC-12:00 to UTC+14:00. Time zones matter for scheduling meetings across countries, understanding international deadlines, and coordinating global software deployments.

What is Daylight Saving Time (DST) and how does this tool handle it?

Daylight Saving Time is the practice of advancing clocks by one hour in spring and reverting in autumn to make better use of daylight. In Europe, DST begins on the last Sunday of March and ends on the last Sunday of October. This tool uses your browser's built-in Intl API to automatically apply DST rules for all IANA time zones — you always get the correct offset for the exact date you enter.

What is UTC and why is it used as a reference?

Coordinated Universal Time (UTC) is the primary time standard by which the world regulates clocks and time. It does not observe Daylight Saving Time and is used as the basis for all other time zones. UTC replaced GMT (Greenwich Mean Time) as the international time standard, though both are often used interchangeably in everyday speech.

How does the meeting planner work?

The meeting planner compares working hours (09:00–17:00 by default) across all selected target time zones and highlights time slots where every zone is simultaneously within business hours. This makes it easy to schedule international calls without overlap confusion. If no overlap exists (e.g. New York and Tokyo), the planner shows no results.

Is my data sent to any server?

No. All conversions happen entirely in your browser using the built-in JavaScript Intl.DateTimeFormat API. Nothing you enter is sent to any server, stored, or logged.