First Flip - What if tenants don't leave?

[Jake Abbatacola]

I will be getting the keys for my first fix and flip property on the 14th. The house currently has tenants living in it, who are on a month to month lease, which ends on the 14th. 

What steps could I take to ensure they leave on time, and what would I need to do if I find that on the 14th they have not left and perhaps don't intend to? 

Any and all advice is much appreciated.

[Michael Plante]

If it were me I would delay closing until the tenants are out