Pasting dates from Excel


I have recently started to use Airtable from Filemaker. I have exported my data from Filemaker into a spreadsheet and then copied and pasted it into Airtable. However the dates of birth which I had listed in the spreadsheet change when they are imported into Airtable. In some cases, the dates are showing 30 + years into the future !!

I see a number of other users have reported the same issue, some going back over a year or so, so cant imagine that the bug hasn’t been fixed !! So what am I doing wrong !!!