Why?
Having the correct date, time and timezone on your computer is important. This will prevent and/or fix any issue related but not limited to:
your web browser stating that the web site certificates are invalid,
Windows Update not working properly,
alerts from Windows where it needs to be reactivated again,
unable to connect to business and/or online game(s) servers.
If you are experiencing any weird behavior with your application or software, it would be best to make sure that Windows time, date and timezone are accurate. If your computer does have the correct time after being turned...