Mac OS X: How to set the date and time automatically

You can have the date, time, and time zone of your computer set automatically by using a network time server.

Open System Preferences and click Date & Time. Click the Network Time tab and select the "Use network time server" checkbox. Choose a server from the pop-up menu or type the DNS name of an NTP server.

If you don't know the name of a network time server, contact your system administrator.

Note: The information is this document comes from Mac OS X Help, the help system included with your computer. It is based on Mac OS X 10.1.2. If a different version is installed on your computer, choose Mac Help from the Help menu. Updated and expanded information may also be available in other Knowledge Base documents.