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As of R-3.5.1, converting from POSIXct to Date creates an intermediate
POSIXlt vector. This uses a non-trivial amount of memory. Directly
converting from POSIXct to Date uses less memory and is roughly twice
as fast.
This solution is a combination of asPOSIXlt and POSIXlt2D from RCore.
The functions are essentially concatenated, with the extraneous parts
removed.
The function name 'asDatePOSIXct' differs from the other rapi* names
because it's not a RCore function. The name isn't as.Date.POSIXct() to
avoid clashes with the current (or future) S3 method.