Thanks chaley, but in the middle of the night had an idea.
I made my #release/Release date column tag-like and hierarchical.
So, I can enter yyyy, or yyyy.mm or yyyy.mm.dd. Which suits me because I always write dates as four digit year, two digit month, and two digit day. Not sure if it would work for people write dates otherwise.
Aside: In the Tag browser:
If I click on 1986 I get books that that do not have a month specified, i.e. the search is always #mydate:(=1986), I expected it to be #mydate:(1986). Perhaps there needs to be a Tag Browser setting to specify if searches of hierarchical categories should create contains, starts with, or equals search terms.
If it exists, pray tell where 'tis - apart from advanced search.
BR
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