Time Zone Converters & World Clock Tools
7 tools in this collection — free, instant, and private in your browser.
Time zone tools exist to solve a deceptively simple problem: the same moment in time has a different clock reading depending on where you are in the world. Whether you are scheduling a video call with colleagues on three continents, calculating how long a flight will take, or simply curious what time it is in Tokyo right now, this category of tools gives you fast, accurate answers without having to do mental arithmetic across UTC offsets.
The foundation of all time zone work is UTC (Coordinated Universal Time), the global reference point from which every regional time zone is measured as a positive or negative offset. Offsets are not always whole hours — India, for example, sits at UTC+5:30, and Nepal at UTC+5:45. Daylight saving time (DST) complicates things further: many countries shift their clocks forward in summer and back in winter, changing their UTC offset by an hour, and not all countries observe DST on the same dates. A good time zone tool accounts for these nuances automatically so you never have to look them up yourself.
Here is a quick guide to choosing the right tool for your situation:
- Timezone Converter and World Time Zones are best when you have a specific time in one location and need the equivalent time in another.
- Meeting Planner and Timezone Overlap Planner help you find a window where multiple participants in different cities share reasonable working hours.
- World Clock gives you an at-a-glance snapshot of current local times across the globe.
- Time Duration Between Two Times calculates elapsed time or counts down to an event, useful for deadlines or travel itineraries.
- Add Time Calculator lets you add or subtract hours and minutes from a starting time, handy for scheduling tasks back-to-back.
When planning international meetings, anchor on a shared reference — usually UTC — and convert outward to each participant's local time. Pay attention to DST transitions, especially in spring and autumn, because the overlap window that worked last week may shift by an hour the following Monday. These tools refresh their DST data automatically, so the results you see are always current.
All time zone converters & world clock tools
All time tools →Compare these tools
| Tool | What it does |
|---|---|
| Add Time Calculator | Add hours and minutes to any start time to find the end time. |
| Meeting Planner — Best Time Across Time Zones | Pick an hour and see what time it is in major cities worldwide. Plan meetings across time zones. |
| Time Duration Between Two Times | Calculate the duration between two times of day in hours, minutes and total minutes. |
| Timezone Converter | Convert a time from one timezone to another instantly. Handles DST automatically. |
| Timezone Overlap Planner | Find the best meeting time across multiple time zones. Add cities, set working hours, and see the mutual overlap window and ranked meeting slots. |
| World Clock — Live Time in Major Cities | Live current time in 12 major cities around the world, updating every second. |
| World Time Zones — Convert Any Time Instantly | Enter a time and pick a source timezone to instantly see that moment across all major world timezones including your own. |
Frequently asked questions
- What is UTC and why is it used as the reference for time zones?
- UTC, or Coordinated Universal Time, is a highly precise atomic-clock standard that does not observe daylight saving time. Because it never changes, it serves as a neutral reference point. Every time zone in the world is expressed as UTC plus or minus a fixed number of hours (and sometimes minutes), making UTC the universal anchor for converting between any two local times.
- How do I find a meeting time that works for three or more time zones?
- Use a tool like the Meeting Planner or Timezone Overlap Planner. Enter all the cities or time zones involved and the tool will highlight windows where each location falls within standard working hours (typically 9 am to 6 pm local time). Look for the overlap block that is closest to the middle of everyone's day to maximize convenience.
- Why does the converted time sometimes change by two hours compared to last week?
- Daylight saving time transitions are the most common cause. When one country moves its clocks forward or back while another does not (or does so on a different date), the offset between them temporarily shifts. This is especially common in March, April, October, and November. Always re-check scheduled recurring events around these transition periods.