"date -d '1 month ago'" does not properly retrieve the day one month before

Solution Verified - Updated -

Issue

  • When running date -d '1 month ago' on Mar 31, “3/1” is retrieved.
  • How does date -d '1 month ago' calculate the day-one-month-before value?

Environment

  • Red Hat Enterprise Linux all version
  • coreutils

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