The Advanced CSV package for Sublime Text just saved me a ton of time today. It's spectacular. If you have a huge unwieldy block of CSV text but want to just select a single column, this is the way to go.
Before anyone suggest opening in Excel, go ahead and try to do it with data that looks even remotely like a date. Excel forces it to become a new date string. CSV is simple and this package makes me feel good.
And if you want some test data to play with, here's a handy little table generator.