sort with libreoffice calc

I broke the internment date up by decade, and I still cannot get it to sort.  How do I sort this table by internment date using libreoffice?
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It is sorted, it's just not obvious how it is being sorted.

In the 1st 2 rows the dates are numeric, and the rest are text. So the sort is sorting numbers before text, which leaves those 2 rows at the top.

Change those 2 dates to text by adding a single quote as the 1st character, and then re-sort your data.

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dwcroninAuthor Commented:
ThomasMcA2: How can I tell if the dates are text or numeric?
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