Don't have = do not have

haven't = have not

We use them to mean the same thing, but the sentence structure will be different. 

I don't have the time to speak to you.

I haven't got the time to speak to you.

how to use haven't and don't have

I don't know when I should use

I don't have or
I haven't

what is the difference?

I don't have - no tengo

"I haven't" depende de la palabra que viene despues. Si es "I haven't got", entonces es otra forma de decir no tengo. Pero si hay un participio pasado, haven't significa haber, por ejemplo: I haven't done it - no lo he hecho.

how to use haven't and don't have

I don't know which I should use

I don't have or
I haven't

what is the difference?

In general (in American English) "don't have" is followed by a noun and "haven't" is followed by a verb (usually past participle). "Don't have" es como "no tener" y "haven't" es como "no haber".

I don't have any homework. She doesn't have a car. We don't have tickets. They don't have time.

I haven't been to Mexico. She hasn't seen that movie. We haven't worked in weeks. They haven't left yet.