Sometimes I need a calendar or a date calculator when doing my genealogy.  In the past, instead of putting a date of birth on a tombstone, they would put the age: 79 years, 6 mos, 5 days.  I don’t know about you, but I am not good at calculating a date of birth from that.  Luckily for us, we don’t have to.  There are many sites and apps that can make that calculation. In fact, even the calculator in Windows can find a date.  I have one site that I like to refer to when trying to determine what day of the week say, August 19, 1987 fell on.  Time and Date can give me the answer plus a whole lot more.