There are several possibilities.
1. Windows time is set to the wrong time-zone or wrong setting for Daylight Savings Time.
2. Windows Time Sync isn't working properly.
3. Windows might be out of date.
For both, click on the clock and choose "Adjust date and time settings..."
1. Time zone will be on the Date and Time tab, Make sure it is set correctly.
2. Click the "Internet Time" tab. Is it set up to synchronize the time with time.windows.com? If it is, Click on the Change Settings button and try changing to say, time.nist.gov , save the settings and click OK. Restart to see if that fixes your problem. If it isn't selected already, try selecting time.windows.com. and then clicking OK and restarting.