Recurring items - 30th Feb results in an error

SOLVED

I run various recurring items on the 29th and 30th of each month.

I have just run my Jan 29th and 30th items and the next posting date had become blank.  Instead of it automatically defaulting to 28th Feb and changing back to 29/30th next month. 

As a result, I now have to input each date individually (as there is no bulk CSV upload option available) to the 28th Feb and next month amend them all back to the 29/30th.

And I will look forward to this happening again next year.  

If a fix is complicated, a bulk download/upload facility would solve this to a satisfactory level. 

Kind regards

Jon