Although this issue is old, the "don't have to download something" solution is this:

(1) Create a file with the following contents:
#!/bin/sh
/usr/sbin/ntpdate -u

(2) Create a login hook which points to that script:
sudo defaults write com.apple.loginwindow LoginHook /path/to/script

(3) There is no 3.

Info on login hook: http://support.apple.com/kb/HT2420

Down Cat

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