mclow.lists added a comment. If we have to go down this road, I'd prefer the approach used in http://llvm.org/viewvc/llvm-project/libcxx/trunk/test/std/experimental/filesystem/fs.op.funcs/fs.op.last_write_time/last_write_time.pass.cpp?r1=315874&r2=315873&pathrev=315874
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