iPhone, iMac calendars won't sync

Starting a couple days ago, my calendar won't sync between my iMac and iPhone. I noticed because I put a phone number in a calendar entry and synced, but when I needed it the entry wasn't on my iPhone. I've tried a lot of things I have found, including changing some iPhone settings, syncing just selected calendars, doing a full shutdown then syncing, quitting iTunes and syncing...

I feel like I'm losing my mind.

I'm not a newbie, I've had an iPhone since 2012. The "usual" fixes usually work, but this is a stumper. Any help will be appreciated.

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iMac (27-inch Mid 2011): OS X El Capitan (10.11.4), 3.4 GHz Intel Core i7, 8GB RAM; iTunes: ver. 12.3.3
iPhone 5: iOS 9.3.1

Has invited:

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SOLVED the problem. After testing out everything else, it turned out the cable was bad! I didnt know that happened, I thought they were all the same. Simple switch out, and voila! Thanks for the suggestions.

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