From Tuesday Feb 19, 2007 to Feb 19, 2008 is 364 days later (52 weeks × 7 = 364, so same day of week plus 0), landing on Monday. Adding 13 more days (Feb 19 to Mar 3: 9 days in Feb 2008 + 3 in Mar = 12 total) shifts Monday by 12 days: Mon→Tue (1), Tue→Wed (2), Wed→Thu (3), Thu→Fri (4), Fri→Sat (5), Sat→Sun (6), Sun→Mon (7), Mon→Tue (8), Tue→Wed (9), Wed→Thu (10), Thu→Fri (11), Fri→Sat (12). The answer should be Saturday.