Accurate Time In Windows

For many years Windows was just a lousy timekeeper, and had no support for leap seconds at all.

Support for leap second handling was only provided by 3rd party (non-Microsoft) software like


Only very current versions of Windows 10 and Windows Server 2019 can keep accurate time, and have some built-in support for leap seconds, which explicitly has to be enabled, though.

For details see these Microsoft blog articles:

Further reading linked from the above:


Martin Burnicki martin.burnicki@meinberg.de 2019-04-17