What day of the week was July 31, 1777?

The day of the week July 31st, 1777 fell on was a Thursday.

Pedro Ignacio de Castro Barros the Argentinian priest and politician (d. 1849) was born on 31 July in 1777.

The U.S. Second Continental Congress passes a resolution that the services of Gilbert du Motier "be accepted the and that, in consideration of his zeal, illustrious family and connexions, he have the rank and commission of major-general of the United States."