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birthtime 

        # File::Stat.birthtime

(from ruby core)
### Implementation from Stat
---
    stat.birthtime  ->  aTime

---

Returns the birth time for *stat*.

If the platform doesn't have birthtime, raises NotImplementedError.

    File.write("testfile", "foo")
    sleep 10
    File.write("testfile", "bar")
    sleep 10
    File.chmod(0644, "testfile")
    sleep 10
    File.read("testfile")
    File.stat("testfile").birthtime   #=> 2014-02-24 11:19:17 +0900
    File.stat("testfile").mtime       #=> 2014-02-24 11:19:27 +0900
    File.stat("testfile").ctime       #=> 2014-02-24 11:19:37 +0900
    File.stat("testfile").atime       #=> 2014-02-24 11:19:47 +0900

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