National Sanctity of Human Life Day is celebrated on January 21, 2018. National Sanctity of Human Life Day is an observance declared by several U.S. Presidents who opposed abortion. President Ronald Reagan designated January 22, 1984 as the first National Sanctity of Human Life Day. The date was chosen to coincide with the 11th anniversary of the Roe v. Wade Supreme Court case that first recognized the constitutionally-protected status of abortion in the United States.
Reagan issued the proclamation annually thereafter, designating Sanctity of Human Life Day to be the third Sunday in January, which represents the closest Sunday to the original January 22 date. His successor, George H. W. Bush, continued the annual proclamation throughout his presidency. Bush's successor, Bill Clinton, discontinued the practice throughout his eight years in office, but Bush's son and Clinton's successor, George W. Bush, resumed the proclamation, and did so every year of his presidency. (With material from: Wikipedia)