What day of the week was July 12, 1913?

The day of the week July 12th, 1913 fell on was a Saturday.

Willis Lamb the American physicist and academic, Nobel Prize laureate (d. 2008) was born on 12 July in 1913.

Second Balkan War: Serbian forces begin their siege of the Bulgarian city of Vidin; the siege is later called off when the war ends.