Timezone Calculator & World Clock

Convert time between any timezones, view real-time world clock, and find the perfect meeting times for international teams. Includes automatic daylight saving time adjustments.

Time ConversionWorld ClockMeeting PlannerDST Aware
Timezone Calculator
Convert times between timezones, view world clock, and find the best meeting times

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Timezone Calculator Features

Our comprehensive timezone calculator provides all the tools you need for international time management.

Time Conversion

Convert any time from one timezone to another with precision. Supports all major timezones worldwide with automatic DST adjustments.

Real-Time World Clock

Monitor current time in multiple cities simultaneously. Perfect for tracking business hours across different regions.

Meeting Time Planner

Find the best meeting times for international teams. Automatically rates meeting times based on business hours in each timezone.

Daylight Saving Time

Automatically handles daylight saving time transitions for accurate time calculations year-round.

Global Coverage

Supports all major cities and timezones worldwide, including UTC offsets and timezone abbreviations.

Business Hours Rating

Intelligent rating system that evaluates meeting times based on local business hours for optimal scheduling.

How to Use the Timezone Calculator

Master international time management with our comprehensive guide

Converting Time Between Timezones

To convert a specific time from one timezone to another:

  1. Select the "Time Converter" tab
  2. Enter the date and time you want to convert
  3. Choose the source timezone (where the time is from)
  4. Select the target timezone (where you want to convert to)
  5. Click "Convert Time" to see the result

The calculator automatically accounts for daylight saving time in both timezones.

Setting Up Your World Clock

To monitor multiple timezones simultaneously:

  1. Go to the "World Clock" tab
  2. Use the dropdown to add cities/timezones you want to monitor
  3. Remove unwanted timezones by clicking the "Remove" button
  4. Click "Refresh" to update all times to the current moment
  5. The clock updates automatically every minute

Planning International Meetings

To find the best meeting time for global teams:

  1. Select the "Meeting Planner" tab
  2. Set your proposed meeting date and time
  3. Choose the timezone for your meeting time
  4. Add all participant timezones using the dropdown
  5. Click "Calculate Meeting Times" to see the local time for each participant
  6. Review the color-coded ratings to find optimal meeting times
Rating System:
Excellent: 9 AM - 5 PM
Good: 8 AM - 7 PM
Fair: 7 AM - 9 PM
Poor: Outside normal hours

Frequently Asked Questions

Common questions about timezone calculations and time conversion

How does the calculator handle daylight saving time?

Our timezone calculator automatically detects and adjusts for daylight saving time (DST) transitions. It uses your browser's built-in timezone database, which is regularly updated to reflect the latest DST rules for all regions. This ensures accurate time conversions year-round, even during DST transition periods.

Why do some meeting times show as "poor" ratings?

The meeting planner rates times based on typical business hours (9 AM - 5 PM is "excellent"). Times outside normal working hours receive lower ratings. A "poor" rating means the meeting would occur very early in the morning, late at night, or during typical sleeping hours for that timezone. This helps you find meeting times that work well for all participants.

Can I use this calculator for historical dates?

Yes, you can convert times for any date, including historical dates. However, keep in mind that daylight saving time rules have changed over the years, and some countries have modified their timezone policies. For the most accurate historical conversions, especially for dates before 2000, we recommend cross-referencing with historical timezone databases.

What's the difference between UTC and GMT?

UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) are often used interchangeably, but there are subtle differences. GMT is a timezone, while UTC is a time standard. UTC is more precise and is the basis for all other timezones. In practice, for most civilian purposes, UTC and GMT are the same. Our calculator uses UTC as the reference point for all timezone conversions.

How accurate is the timezone calculation?

Our timezone calculator is highly accurate and uses the same timezone database that powers most operating systems and web browsers. This database is maintained by the Internet Assigned Numbers Authority (IANA) and is updated regularly to reflect changes in timezone rules worldwide. The calculations are accurate to the minute for all supported timezones.