Frequently Asked Questions
Answers about how the tools on this site work. For questions about time zones themselves, each one has its own page, listed further down.
About the Tools
What is WorldTimeConverter.net?
A free set of time tools: a time zone converter, a world clock, pages for specific city and UTC conversions, calendar tools such as week numbers and public holidays, and calculators for business days, time duration and Unix timestamps. There is no account or login.
How accurate is the time zone conversion?
The converter takes its time zone rules from your browser, which uses the IANA time zone database that operating systems and servers also use. That means it applies the right offset and daylight saving rule for the date you choose, but it is only as current as your browser: if a country changed its clocks recently and your browser is out of date, a conversion for that place can be an hour out. Keeping the browser updated avoids this. The IANA database page explains how those updates work.
What week number is it today?
The current week number page shows it live. Week numbers run from 1 to 52, occasionally 53. The ISO 8601 standard, used in Europe and in international business, defines week 1 as the week that contains the year's first Thursday. The US often numbers weeks differently, so a week number from a US source can differ from the ISO one.
How do I count business days between two dates?
Use the business days calculator. It counts Monday to Friday and leaves out weekends. It does not remove public holidays, because they differ by country; look them up on the public holidays page and subtract any that fall on a weekday in your range.
Does the site store my location?
The time zone or city you choose is used in your browser to work out the time or the moon data for that place. No account is needed, and the site never asks for your device location. It does use analytics and advertising technologies (Google Analytics and Google AdSense), which follow the choices you make in the cookie banner. The privacy policy and cookies policy have the details.
Does it work on a phone?
Yes. The tools work in any modern browser on a phone, tablet or computer, and there is no app to install.
Questions About Time Zones
These questions come up often, and each has a page that answers it in full rather than a short reply here:
What is the difference between UTC and GMT?
They show the same clock time, but UTC is an atomic standard and GMT is a time zone.
What is daylight saving time and who uses it?
Which countries change their clocks, which do not, and why the dates differ.
When do the clocks change in 2026?
The dates for the US, Canada, Europe, Australia and New Zealand.
What is the time difference between EST and IST?
Every hour of the day converted for both winter and summer.
What is a time zone?
Why there are more than 24 and why the borders are where they are.
What is military time?
The 24-hour clock written as four digits, with a full chart.