World Clock & Meeting Planner

Time Zone Converter

Convert time between different countries and plan meetings across time zones instantly. DST-aware • 45+ cities • Live clock

Tips for Scheduling International Meetings

Make global collaboration smoother with these proven practices.

Aim for the 9 AM – 12 PM overlap window — it falls within business hours for the widest range of timezones.

Use the green / yellow / red indicators to spot who will be joining early morning or late at night.

Rotate meeting times for recurring calls so the inconvenient slot is shared fairly across team locations.

Always send calendar invites with the timezone explicitly stated to avoid confusion from DST changes.

Check the date badge (+1d / −1d) — scheduling across the International Date Line means the meeting could be on different calendar days.

If a location always gets a red card, consider an async update (Loom / written summary) rather than forcing attendance.

Common Timezone Offsets at a Glance

Quick reference for frequently used timezone combinations. Note: offsets shift by 1 hour when DST is active.

FromToStandard Difference
IST (India)EST (New York)IST is 10 hr 30 min ahead of EST
IST (India)GMT (London)IST is 5 hr 30 min ahead of GMT
IST (India)GST (Dubai)IST is 1 hr 30 min ahead of GST
IST (India)JST (Tokyo)IST is 3 hr 30 min behind JST
EST (New York)GMT (London)EST is 5 hr behind GMT
EST (New York)PST (Los Angeles)EST is 3 hr ahead of PST
GMT (London)CET (Paris / Berlin)GMT is 1 hr behind CET
SGT (Singapore)AEST (Sydney)SGT is 2 hr behind AEST

About This Tool

How It Works

The converter uses the IANA timezone database built into every modern browser via the Intl.DateTimeFormat API. Enter a date and time in any timezone, and the tool instantly calculates the equivalent moment in all selected target timezones — including accurate daylight saving time transitions with no manual adjustment needed.

Privacy First

Everything runs entirely in your browser. No data is sent to any server. No signup required, no tracking, no ads. Your timezone preferences exist only for the duration of your current browser session.

Daylight Saving Time

DST changes are handled automatically. Because the tool uses named timezone identifiers (e.g. America/New_York) rather than fixed UTC offsets, the correct offset is always applied based on the exact date you select.

Meeting Planner

Each timezone card shows a colour-coded meeting quality indicator: green for standard business hours (9 AM – 6 PM), yellow for early/late working hours, and red for sleeping hours — helping you find the optimal time slot for all participants in one glance.

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Frequently asked questions

Quick answers about this free online tool.

The converter uses your browser's built-in Intl (Internationalization) API with full IANA timezone database support. When you pick a date, time, and source timezone, it calculates the precise UTC moment and then displays that exact moment in every target timezone — including correct daylight saving time offsets automatically.

Yes. Because the tool uses IANA timezone identifiers (e.g. 'America/New_York') rather than fixed offsets, all DST transitions are handled automatically by your browser. New York in summer will correctly show EDT (UTC-4) and in winter EST (UTC-5) without any manual adjustments.

The left-border colour and icon indicate whether the converted time is suitable for a meeting: Green (Good for meetings) means 9 AM – 6 PM local time; Yellow (Early/late hours) means 7–9 AM or 6–9 PM local time; Red (Sleeping hours) means 9 PM – 7 AM local time. Use these to quickly identify clashes when planning international calls.

It means the converted date in that timezone is one day ahead or behind the source date. For example, if it is Monday evening in New York, it might already be Tuesday in Tokyo — the '+1d' badge makes this immediately visible so you never accidentally book a meeting for the wrong day.

The tool reads your system timezone via the Intl.DateTimeFormat API when it first loads. This means you do not have to manually select your own timezone — it is detected and set as the 'Convert From' zone automatically. You can still change it to any timezone you like.

Yes. Use the 'Add Timezone' button at the bottom of the results panel to add additional target zones. The tool supports up to 10 target timezones simultaneously so you can plan complex global meetings across multiple continents.

No. All timezone conversions happen entirely inside your browser using the native JavaScript Intl API. No data is sent to any server and nothing is stored outside your current browser session.