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"date -d '1 month ago'" が一月前の日付を正しく出力しません

Solution Verified - Updated -

Issue

  • 3/31 に date -d '1 month ago' を実行したところ、3/1 が返されました。
  • date -d '1 month ago' はどのように一月前を算出していますか?

Environment

  • Red Hat Enterprise Linux
    • Red Hat Enterprise Linux 6
    • Red Hat Enterprise Linux 5
    • Red Hat Enrerprise Linux 4
    • Red Hat Enterprise Linux 3
  • coreutils

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