Q:

How do I create a new Joda DateTime truncated to the last hour? 

I am pulling timestamps from a file that I want to create a new DateTime for, but I want to create the DateTime at the floor of the hour (or any Joda Period will do). 
How Can I do this? 

A:

Wohoo, found it.  Simple like everything in Joda once I traced down the calls. 
DateTime dt = new DateTime().hourOfDay().roundFloorCopy();

