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  • @ilkkachu, even though POSIX might not support btimes, but some file systems supports it. And my goal is not to set source's btime to a target's, but to preserve target's existing one. So I'm really want to set anything back Commented Sep 7, 2023 at 5:57
  • @ilkkachu I need to preserve birth time. I don't care much about change time Commented Sep 7, 2023 at 6:05