I'm having problems with syncing my iphone calendar to my ipad, but not the other way around

My iPhone 5 will not sync with my iPad calendar. If I make any changes or add an appointment on my iPhone it will not sync to either iCloud or my iPad, however if I add or change an appointment on my iPad or iCloud it will update my iPhone calendar. I've read where other's are having the same problems but haven't read anyone's post of where a solution has helped. Anyone??