Earliest Potential Date for Septuagesima Sunday Jan 18, 2000 The Slaves of the Immaculate Heart of Mary This is the earliest day that Septuagesima Sunday, the first approach-Sunday to Lent, can occur. The latest day on which it can fall is February 21, or, in leap year, February 22. Share this:TweetWhatsAppShare on TumblrTelegramPocketLike this:Like Loading... Related