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This PR is stale because it has been open for 30 days with no activity.

Driving by as I've also hit this same bug...

Why have you set _MACOS_EPOCH and _MACOS_EPOCH_NAIVE to 2001,1,1? When I googled it said same as Unix epoch 1970,1,1.

I don't know where you saw documentation indicating otherwise, because CFBinaryPList.c's implementation of binary CFDate calls CFDateGetAbsoluteTime, which per the documentation:

Absolute time is measured in seconds relative to the absolute reference date of Jan 1 2001 00:00:00 GMT. A positive value represents a date after the reference date, a negative value represents a date before it. For example, the absolute time -32940326 is equivalent to December 16th, 1999 at 17:54:34.

The existing code already set the epoch to 2001-01-01.

It's unclear what the test failures actually are here, though, because the build logs have long-expired as this patch was unreviewed for a while. A test for this new feature would be useful, though. :)

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#113363 implements an option to read and write timezone aware datetime values and with that this PR is no longer necessary.