Unable to “Edit series” for a repeating event in sharepoint calendar list

Issue:

Unable to “Edit series” for a repeating event in sharepoint calendar list

Problem Description:

There is a repeating event (event series) in sharepoint calendar list with “All day event” selected and no specific start and end time.

When someone opens an event and then clicks on "Edit series", it opens up the series in edit mode. But after making any type of changes, page can’t be saved and clicking “Ok” returns to same edit page reflecting some validation errors which doesn't allow us to commit the changes.

Workaround\Resolution:

Solution for this problem issue is extremely simple very unobvious.

Whether we make changes to the series or not, we must uncheck the box for “All day event” and then select the check box again.