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I've left a mostly finished PR on #8983, but I've decided it's not really worth continuing to work on. Anyone can feel free to take it and run with it if they want to implement the fix for this.
As Alexey mentions, that PR indeed already fixes this bug, I mainly blocked on getting consistent behavior across all platforms. Currently that PR has consistent behavior across all platforms if you disable wcsftime *except* Ubuntu 14.0, which seems to have some kind of funky bug in wcstombs, though for the life of me I don't know how to consistently trigger it. I suspect that using strftime instead of wcsftime on all platforms would lead to simpler code that works most consistently, but I am guessing wcsftime is faster.
Another option is to use wsftime but fall back to strftime on MacOS in the event that the error condition (blank output from non-blank input) is detected.