why can't I sort this by internment date

when I try to sort this by internment date, it won't do it.  What is wrong?
20161008-cemetery.ods
dwcroninAsked:
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Ejgil HedegaardConnect With a Mentor Commented:
Some of the dates are not dates, but from row 2022 down it is text that looks like dates.
In Excel I would select the range A2:A3355 and use text to column.
Then it will be converted to dates, except the last 3, where the day value is 0.
Then you can sort.
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