36 U.S.C. § 119 : US Code - Section 119: National Day of Prayer

Search 36 U.S.C. § 119 : US Code - Section 119: National Day of Prayer

The President shall issue each year a proclamation designating
the first Thursday in May as a National Day of Prayer on which the
people of the United States may turn to God in prayer and
meditation at churches, in groups, and as individuals.