Date: 19 Adar Rishon 5581
From: Rabbi Moshe Sofer
To: Unknown recipient
In a leap year, does an unqualified 'Adar' refer to Adar Rishon or Adar Sheni for purposes of yahrzeit, kaddish, documents, and vows? The Chasam Sofer distinguishes between 'lashon Torah' and 'lashon bnei adam,' issuing eight detailed practical rulings.
Source: Shu"t Chasam Sofer OC §163