YAML current date in rmarkdown

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This is a little bit tricky, but you just need to make the date field valid in YAML by quoting the inline R expression, e.g.

date: "`r format(Sys.time(), '%d %B, %Y')`"

Then the parsing error will be gone, and the date will be generated in the markdown output so Pandoc can use the value from Sys.time().

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