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| |[https://www.timeanddate.com/ Timeanddate.com] | | |[https://www.timeanddate.com/ Timeanddate.com] |
| | Calculates birthdate from age at death and age at death from birth and death date '''''[[Date Calculator|Instructions]]''''' | | | Calculates birthdate from age at death and age at death from birth and death date '''''[[Date Calculator|Instructions]]''''' |
| | Uses calendar month method and provides 30 day month method (8870 method), if different. | | | Uses calendar month method showing results from subtracting years first and also subtracting days first. |
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| | [http://www.searchforancestors.com/utility/birthday.html Tombstone Birthday Calculator] | | | [http://www.searchforancestors.com/utility/birthday.html Tombstone Birthday Calculator] |