Time Zone Converter
Convert times between any world time zones and find overlapping business hours for international teams.
What is Time Zone Converter?
Time zone management is a daily challenge for distributed teams, international businesses, and anyone scheduling calls across borders. The world has 38 distinct time zones spanning from UTC-12 to UTC+14, with many countries observing Daylight Saving Time (DST) on different dates, creating further complexity. Common problems: scheduling a call at "9am London time" requires knowing whether London is on GMT (UTC+0) or BST (UTC+1) depending on the time of year; New York can be 5 or 6 hours behind London depending on the week when one region has shifted to DST but the other hasn't; and working out the overlap between teams in London, New York, and Singapore requires understanding that when London is at 9am, New York is at 4am and Singapore is at 5pm. This converter handles all time zone conversions accurately, including DST transitions, and helps identify practical meeting windows across multiple time zones simultaneously.
How to Use Time Zone Converter
- 1
Select Source Time and Zone
Enter a time and select its time zone. Use city names or standard zone codes (EST, GMT, IST, etc.). The tool automatically adjusts for current DST status.
- 2
Add Destination Zones
Add one or more destination time zones to see the equivalent time in each simultaneously. Common multi-zone scenarios (US+UK+India, etc.) can be saved as presets.
- 3
Find Meeting Windows
Use the overlap finder to see which hours of the day fall within business hours (9am–6pm) for all selected time zones — instantly identifying viable meeting windows.
Use Cases
Scheduling International Client Calls
When working with clients across multiple continents, use the overlap finder to identify the hours that fall within business hours for all parties. A London–New York–Singapore meeting has limited overlap: 9am–10am NYC = 2pm–3pm London = 10pm–11pm Singapore. Understanding this upfront prevents scheduling calls in the middle of someone's night.
Distributed Team Standup Scheduling
Remote teams use this tool to find a standup time that is reasonable for all team members. Document the agreed meeting time in multiple zones in your team handbook to prevent confusion when DST shifts cause the time to change for some team members but not others.
Global Event and Webinar Timing
When hosting a webinar or online event for a global audience, identify which time maximises attendance across your key regions. Use the overlap tool to find the time that falls within working hours in the most regions — typically 9am–10am US Eastern hits UK afternoon, EU late afternoon, and misses Asia-Pacific.
Features
Accurate DST Handling
Automatically applies Daylight Saving Time rules for all regions, including the different DST transition dates for US, EU, UK, and other regions — preventing the ±1 hour errors that occur in non-DST-aware converters.
Multi-Zone Overlap Finder
For up to 8 time zones simultaneously, shows a 24-hour grid with overlapping business hours highlighted — the fastest way to find viable meeting windows for distributed teams.
City and Country Search
Search by city name, country, or time zone abbreviation (EST, PST, GMT, IST, AEST, etc.) — covering 400+ major cities with automatic time zone and DST assignment.
Meeting Time Scheduler
Enter a proposed meeting time and see it displayed in all team members' local times — shareable as a link so every participant sees the time in their own zone.
Frequently Asked Questions
UTC (Coordinated Universal Time) is the modern international time standard — a scientific standard maintained by atomic clocks. GMT (Greenwich Mean Time) is the time zone at 0° longitude (Greenwich, London). For practical purposes, UTC and GMT are the same offset (UTC+0 = GMT). However, GMT is technically a time zone, while UTC is a time standard. The UK observes GMT in winter and BST (British Summer Time, UTC+1) in summer. When precision matters (programming, scheduling), use UTC as it never has DST adjustments.
The US transitions to DST on the second Sunday in March and back on the first Sunday in November. The UK and EU transition on the last Sunday in March and last Sunday in October. This creates 2–3 week windows in spring and autumn where the US-UK time difference is different from usual — New York is normally 5 hours behind London, but for about 2 weeks in spring it's only 4 hours, and for about 1 week in autumn it's 6 hours. Arizona (USA) and Iceland (Europe) don't observe DST at all, adding further complexity.
UTC+5:30 means the time zone is 5 hours and 30 minutes ahead of UTC. India Standard Time (IST) is UTC+5:30 — one of the few time zones with a 30-minute offset (most are full-hour or occasionally 45-minute offsets from UTC). To convert: if UTC is 12:00 noon, IST is 17:30 (5:30pm). The "+30 minutes" offset exists for historical reasons related to India's geographical centre being at the midpoint between the UTC+5 and UTC+6 zones.
Always schedule meetings using UTC when precision is critical, and convert to local times for communication. Tools like calendar invites that specify time zones handle DST automatically when both parties use modern calendar software. For recurring meetings, review them twice yearly when DST transitions happen to ensure the local times are still acceptable for all parties. The most common DST scheduling error is a recurring weekly call that is set as "3pm London time" but appears as "3pm GMT" in a calendar — meaning it shifts by an hour relative to other participants when BST begins.
Need a Professional Website?
JAIDOO EMPIRE builds fast, SEO-optimised websites for businesses worldwide. All free tools are built and maintained by our team.
Start Your Project
