How to Use These Tools
Master time zone coordination with our step-by-step guides for each tool
Time Converter
When to use: Converting a specific meeting time or appointment from one time zone to another.
How to use:
- Select your source city (where the time originates)
- Select your destination city (where you want to know the time)
- Pick the date and time in the source city
- The equivalent time in the destination city appears instantly
💡 Pro tip: The tool automatically accounts for Daylight Saving Time differences between locations.
Smart Meeting Scheduler
When to use: Finding optimal meeting times for teams across 3+ time zones.
How to use:
- Add cities for all meeting participants (up to 8)
- Click "Find Optimal Meeting Times"
- Review recommended time slots ranked by score
- The tool highlights times that work best for everyone
💡 Pro tip: Higher star ratings mean the time works better for more participants during business hours.
Business Hours Analyzer
When to use: Checking if a colleague or office is open before calling or sending urgent messages.
How to use:
- Select the first city (your location)
- Select the second city (colleague's location)
- View the business hours overlap analysis
- See recommendations for best contact times
💡 Pro tip: Green zones indicate ideal business hours overlap—perfect for quick sync calls.
Timeline Converter
When to use: Visualizing how time progresses across multiple locations simultaneously.
How to use:
- Add cities you want to track (up to 6)
- See their positions on a 24-hour visual timeline
- Watch as time updates in real-time
- Quickly understand "what time is it there now"
💡 Pro tip: Colors on the timeline indicate time of day—blue for night, yellow for daytime.
Time Calculator
When to use: Working out the raw difference between two places, without tying it to a particular date and time.
How to use:
- Pick the two cities you want to compare
- Read the current difference between them
- Use it as a standing figure — "Singapore is seven hours ahead of me"
💡 Pro tip: That figure is only stable if neither side changes its clocks. Check the city pages for the dates it shifts.
Travel Planner
When to use: Working out what time you actually land, and how much of a time shift you are asking your body to absorb.
How to use:
- Choose your departure and arrival cities
- Enter your departure time in local time at the airport you leave from
- Enter the flight duration in hours
- Read the arrival time, the same moment in your home time, and the direction of the shift
💡 Pro tip: The "body clock says" figure is the one that matters on arrival — it is what your sleep is still running on.
Understanding the Results
Time Indicators:
- • Green = Business hours (9 AM - 6 PM)
- • Yellow = Early morning or evening
- • Gray = Night time (avoid calling)
Common Mistakes to Avoid:
- • Forgetting to check DST status (we handle this automatically)
- • Calculating time differences weeks in advance (use the date picker)
- • Confusing cities with the same name in different countries
Visual Tools
Interactive time zone tools with visual representation
Time Converter
Convert a specific date and time from one city to another
Select source and destination cities to convert time
Why time zone maths is harder than it looks
Most people assume converting between two time zones means adding or subtracting a fixed number of hours. It doesn't, and the exceptions are exactly where scheduling mistakes come from. These tools exist because four specific things break the simple mental model.
Offsets are not all whole hours
India runs at UTC+5:30, Nepal at UTC+5:45, and the Chatham Islands at UTC+12:45. Of the 242 IANA zones this site covers, ten sit on a half- or quarter-hour offset. Any calculation that assumes whole hours is wrong for those locations year-round.
The gap between two cities changes during the year
London and New York are five hours apart for most of the year — but for two weeks each March, and one week each autumn, they are four. The two regions switch to daylight saving on different dates, so a recurring meeting that was correct in February silently moves in March.
Most of the world doesn't change clocks at all
Japan, India, China and almost all of Africa keep a fixed offset. When your own clocks shift and theirs don't, the overlap window with your working day moves by an hour without anyone changing a calendar entry.
Country and time zone are not the same thing
The 181 countries covered here span 242 distinct zones. Picking "Australia" or "United States" is not enough to know the time — which is why every tool below resolves by city, not by country.
Each tool applies the IANA time zone database, the same dataset operating systems use, so historical rules and daylight saving transitions are handled for you rather than approximated.