Punctuations

We got divorced on August, 2, 2017.

We got divorced on August 2, 2017.

We got divorced on August 2 2017.

We got divorced on August 2- 2017.

Listen, you need to be careful from now on.

Listen you need to be careful from now on.

Listen, you need to be careful from now on!

Listen- you need to be careful from now on.