• Download Lingon: http://prdownloads.sourceforge.net/lingon/Lingon-1.2.dmg?download
• Copy the Lingon application to your /Applications folder
• Launch the Lingon application
• Click the toolbar's "Assistant" button (bow-tie icon)
• Make sure that "Run a job at startup" radio button is selected and click "Next"
• In the "Label" field, type in a name for this task, using reverse-domain naming (e.g. org.johndoe.ntpdate)
• Uncheck the "Launch only when I log in" checkbox
• Check "Must be run as root" (this checkbox will be enabled when you un-select the one above)
• Click "Next"
• In the "Job" field, type "/usr/sbin/ntpdate -u" and click "Create"
• At this point, you should be prompted to authenticate as an admin user

If you successfully authenticated yourself, you should now be looking at the "User Daemons" tab, with your new entry (identified by the label you provided) marked as Loaded (prefixed by green little play-like icon).

You can quit Lingon at this point - that ntpdate command should be issued as root the next time you reboot, which will cause an immediate re-synch of the of the system's date & time against Apple's time servers.

Obviously, you must be online for the time-synch operation to succeed.

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