Time Zone Calculator — Free Tool

Time to Convert

Date

From Time Zone

To Time Zone

Tips for scheduling across time zones

Always confirm the meeting time in UTC alongside local times — it's unambiguous and removes any DST confusion from the equation.
Use a "golden window" for global teams: 9am–12pm UTC typically works for Europe, India, and East Coast USA without anyone starting before 8am or ending after 6pm.
Include the date when sharing converted times — a meeting at "Monday 11pm PST" becomes Tuesday in Asia, which catches people out.
Set calendar events in the invitee's local time zone. Most calendar apps (Google Calendar, Outlook) handle DST adjustments automatically when you specify the IANA time zone.

Time zone conversion made simple

The world is divided into 24+ primary time zones, but with daylight saving time (DST), the picture becomes more complex. Countries observe DST at different dates — the US "springs forward" in March, while the UK follows in the same month, but Australia's seasons are opposite, so their clocks shift in October. This calculator uses the IANA time zone database via the JavaScript Intl API to handle DST transitions automatically.

For remote teams and international freelancers, a reliable time zone converter is essential. It prevents the frustration of missed meetings and the cognitive load of mentally calculating offsets when daylight saving shifts.

Frequently asked questions

What is UTC?

UTC (Coordinated Universal Time) is the global time standard from which all other time zones are offset. It is essentially the same as GMT but is maintained by atomic clocks and does not observe daylight saving time. UTC+0 is the reference point: New York is UTC-5 (or UTC-4 in summer), London is UTC+0 (or UTC+1 in BST), and Tokyo is always UTC+9.

How do I handle DST when scheduling?

The safest approach is to schedule using UTC or to use calendar apps that store events with IANA time zone identifiers (e.g., "America/New_York" rather than "EST"). These apps automatically adjust for DST transitions. If you share times manually, always specify the date — the same local time can represent a different UTC time depending on whether DST is in effect.

What are best practices for international team scheduling?

Rotate meeting times so the same team members aren't always inconvenienced. Aim for an overlap window where all participants are within working hours (8am–7pm local). For async-first teams, record meetings and share in a shared team calendar in UTC. Worldtimebuddy.com is also a useful visual tool for finding overlapping working hours across many time zones.

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