In my opinion it is a necessary detail for the article:
https://www.haiku-os.org/get-haiku/release-notes/
Well, it’s guised in a sort of math word problem.
It’s been just about a month less than six years since Haiku’s last release in November 2012.
I’d say a month precise date should do for the release note. For the 2nd beta we may want to use a less clunky sentence, though… 
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The “News” announcement for R1/beta1, which links to the release notes, does indeed have a date attached.