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Tennessee Genealogical Society taken from the Jacksonville Area Genealogical and Historical Society, November 1, 1985 1. Set down death-year, month and day expressed in numbers, as example below: Death date: 20 August 1973 1973 8 20 Birth date: 10 June 1901 -1901 -6 -10 72 ys 2 mo 10 ds
2. To "borrow days" when numbers are unequal: The formula is 1 month-30days. 7
Death date: 10 August 1973 1973
Birth date: 20 June 1901 -1901 -6 -20 72 ys 1 mo 20 ds
3. To "borrow a month". The formula: 1 year = 12 months.
2 12mo
Death date: 20 August 1973 197 Birth date: 10 Sept. 1901 -1901 -9 mo 10ds 71 ys 11mo 30ds
Given a death date and yr-mo-da, one can reverse the process to find the approximate birth date. The formula is: 12 months x 30 days = 360 days. This will not give exact date of birth, because we actually have 365 days per year, except leap years. However, this methods of birth determination would give a date within 5 days of actual birth, by which one could look for birth records, etc.
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