Ubuntu and Windows may have trouble syncing time because when they are dual booted, they both assume that your hardware clock is set to a different time setting. Ubuntu assumes that your clock is set to UTC and Windows assumes that your clock is set to local time. Answers Launchpad has solutions to fix the syncing issues. To correct the issue, configure Ubuntu to be set to local time. Launch your terminal window and click on the description box. In the code string change the UTC default value to no. Click save. This way, when you change to the different operating system, you will no longer have syncing issues.