I’ve noticed lately that my computer’s time is off by over a minute, sometimes several. This happens as after I have put my computer in standby by closing the lid. The problem it causes is that with the time out of sync, I cannot use my auth tokens to log into my work’s VPN. So instead of opening the Time & Date preferences, I use this one line command to quickly update.
Open Terminal and type:
sudo ntpdate -u time.apple.com
You can even create an alias in your .bash_profile to make it simpler:
alias synctime="sudo ntpdate -u time.apple.com"