Post displaying in customizable order

I’m trying to create some kind of Event list but I don’t like any of the Event Calendar Plugins. So, basically, what I would like is this:

when creating a new post, I’d like to add some kind of date-tag. So that, if I add a post later on with a more recent date-tag, it shows up before the previously entered posts.

I hope this explanation is sufficient, but let me clarify with an example:

POST ONE – about an event on November 10
POST TWO – about an event on November 30

I then add POST THREE which is about an event on November 5.
I would like my posts to display like this:

POST THREE
POST ONE
POST TWO

How can I achieve this?