How do I recover missing days on my Calendar app?

"How do I recover missing days on my Calendar app?: My calendar has missing days. It jumps from 30th May to 5 th June. And it continues randomly throughout the year. How do I get the days back?"

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Troubleshooting Missing Calendar Entries:

Try the Following Links:

• Restore Contacts, Calendars, Bookmarks, and More Using iCloud.com - Apple Support

• If your iCloud Contacts, Calendars, or Reminders won’t Sync - Apple Support

And... for the note:

Backing Up Calendar with iCloud:

You Can't: this is not a feature of iCloud.

• Go Here: What does iCloud Back Up? - Apple Support
• As it Reads: "your iPhone, iPad, and iPod touch backups only include information and settings stored on your device. They do not include information already stored in iCloud such as Contacts, Calendars, Bookmarks, Notes."

It seems that some days are missing from the calendar view? Any screenshots? It would help to see what’s going on.