Running an EC2 server? Go install NTP right now…

Seriously, go do it right now – I’ll wait for you to get back.

apt-get install -y ntp

Good job! I’m not sure why I hadn’t come across this yet, but several of my instances had fairly significant clock drifts – significant enough that SES was generating time signature errors. Installing ntp will now be a standard part of a new instance’s setup.