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

问题

This question already has answers here:

JodaTime equivalent of DateUtils.truncate() (4 answers)

Closed 4 years ago.

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?

回答1:

Wohoo, found it. Simple like everything in Joda once I traced down the calls.

DateTime dt = new DateTime().hourOfDay().roundFloorCopy();

来源：https://stackoverflow.com/questions/1207957/how-do-i-create-a-new-joda-datetime-truncated-to-the-last-hour