ICal won't sync from mac to iphone or the other way

I have found that my iPhone calendar is not being updated when I sync with the iMac - and it doesn't appear to work the other way either.
It used to work perfectly and I haven't changed anything.
I have made sure all the boxes for syncing calendars are checked but that has made no difference.
Any help would be appreciated.
thanks
Jonathan

Hey there Jonathan,
The article linked below provides a lot of great troubleshooting tips that’ll resolve most issues like the one that you’ve described, where calendar information isn’t syncing between your iMac and iPhone.
Sync Services: Advanced troubleshooting for contact and calendar syncing - Apple Support
So long,
-Jason

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