Convert DateTime for MySQL using C#

I want to change the DateTime for MySQL in C#.

My MySQL database only accept this format 1976-04-09 22:10:00.

In C# have a string who have a date value:

string str = "12-Apr-1976 22:10";

I want to convert for MySQL then it look like:

1976-04-12 22:10

How I can change them or how other programmer do this by using dd mm hh yy method? Can anyone tell me about them?