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Cemetery Inscriptions

Birthdate Calculator
Use the '8870 Dating Formula' to ascertain a birth date from a tombstone death date. Example: died May 6, 1889, aged 71 years 7 months 9 days. Write as: 18890506 (for died 1889 year 5th month 6th day) subtract 710709 (for 71 years 7 months 9 days). The sum of these is 18179797. Subtract 8870 (the formula) which leaves 18170927 (which is Sept 27, 1817 - or - another words the date of birth. Check yourself by adding the number of years, months and days to the birthdate and see if you come up with the death date. Sometimes the number is not quite so easy to read and must be further interpreted. Such as 18490342. Since there arent't 42 days in March, you have to 'give' 31 days (number of days in March) to the months which leaves 18490411. No one thinks about leap years and such in calculating yrs, mnths and days.

Updated Jul 2013

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