To open Date and Time, click Start, click Control Panel, click Date, Time, Language, and Regional Options, and then click Date and Time.
Internet time synchronization updates your clock on a regular basis, but only when you are connected to the Internet. It takes just a moment and should not interfere with your work.
You can type the name of a time server if you want to use one that is not listed. Only time servers that use the Simple Network Time Protocol (SNTP) will work. Inserting an Internet address that uses the Hypertext Transfer Protocol (HTTP) will not work. For more information, refer to RFC 1305. You can obtain RFCs from the RFC Editor Web site.
The time server time.windows.com is operated by Microsoft. The time server time.nist.gov is operated by the U.S. government. Other time servers provided by your computer's manufacturer may also be listed.