1) This is not the first time that the residents
of the capital have had to suffer such inconveniences. (This is collected from a daily newspaper) 

2) "This is not the first time that the residents
of the capital have to suffer such inconveniences.

I know the rules of "have to/has to,  had to ". But I haven't found anything  on "have/has had to ".  



Would somebody tell me the difference between those sentences?