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Re: case with irregular nouns
by Greg Brush - Thursday, 1 January 2009, 12:40 AM
  Demotic ο μήνας is NOT "irregular" -- its inflection is exactly what one expects of a demotic masculine noun ending in -ας:
o μήνας, του/τον μινα, οι μήνες, των μινών

The του μηνός that you refer to is technically the genitive of the ancient/classical version, ο μήν, and can be seen in more formal writing. For a little more about του μηνός, see "FYI: μήνας" in Discussion Forum 28.

Hope this helps,
Greg Brush