//Here I am setting 1 Hour interval to the current date.
NSDate *date = [NSDate dateWithTimeInterval:3600.0 sinceDate:[NSDate date]];
Here is the code to add time in seconds to set the interval.
//Here I am setting 2 mins interval to the current date.
pickerDate.date = [NSDate dateWithTimeInterval:120.0 sinceDate:[NSDate date]];