OS X Calendar won't sync to iPhone

I have found that creating a "dummy" calendar event on my iPhone will unjam synching issues and force OS X and iOS systems to talk to each other. This is not a very elegant method, but it's effective. Simply delete the fake entry when your Mac and iPhone have shared their respective calendars.

I tried the solutions and none worked for me; iPhone 5S sync with MacBook Pro High Sierra; I rebooted both devices; what worked was to go on iPhone Settings -> First icon (my name) then scroll down to iPhone(3) (the name of my iPhone - could be different for you) clicking on which solved the problem - at least for now.