Check the accuracy of your System Clock in Windows 11/10

Windows 11 and Windows 10, by default, syncs your system time with Internet servers, every week. We have already seen how you can change the Internet Time Update interval to make Windows synchronize time more frequently.

Time synchronization in Windows works like this. It is the Windows Time Service or W32Time.exe, that maintains date and time synchronization. The default time sync interval on stand-alone clients and servers is 604,800 seconds or 7 days.

You can also choose which Internet Time server, you want to synchronize your computer’s time, via Date and Time Settings.

To do so, click on the Time in the taskbar notification area > Change date and time settings > Internet Time tab > Change settings.

Here, you can select the time server from the drop-down menu.

What is the system time accuracy of Windows?

The system time accuracy of Windows 10 and Windows Server 2016 or newer can achieve 1 second, 50 milliseconds, or even 1 millisecond under optimal conditions, depending on a stable and accurate root time source.

Check the accuracy of the System Clock in Windows

While most of these are near-accurate, if you want to check their accuracy, you can compare it with an atomic clock, which will give you perfect results.

Time.is is a free online service that lets you compare your system time with an atomic clock, irrespective of your operating system or device.

The displayed time has an accuracy or precision of 0.02-0.10 seconds, depending on your internet connection and how busy your computer is. It also adjusts to Daylight Saving Time, even if your computer clock does not.

While a few seconds here or there will not make any difference, checking the accuracy of your Windows computer’s time will do no harm.

It tells you how accurate your system time is and shares some basic facts about your location.

Specifically, it lets you:

1. Check the accuracy of your system clock
2. Find out what the exact time is right now at 7 million locations around the world
3. Compare time at different locations
4. Display Calendar, Sunrise and sunset times, Time Zone details, Latitudes and longitudes, Local holidays, population, and more.

Head over to Time.is if you want to find out how accurate your system time is. Is it fast? Or slow?

How accurate is my PC clock?

When synchronized with an atomic clock, your PC clock is usually accurate within 0.02-0.10 seconds. However, the accuracy can vary depending on your internet connection and the load on your computer. Regular synchronization can help maintain this high level of precision.