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The 8870 Dating System

Use the '8870 formula' to ascertain a birth date from a tombstone death date.

Example: died May 6, 1889, aged 71 years, 7 months, 9 days. Write the formula as:

18890506 for died 1889, 5th month, 6th day
- 710709 for 71 years, 07 months, 09 days
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18179797 - 8870 subtract the formula number
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18170927 born 1817, 9th month, 27th day

Sometimes the final answer has to be interpretted a little differently. Such as, if you get an answer of:

18251355 1825 year, 13th month, 55 day
18260155 1826 year, 01 month, 55 days after you subtract 12 months from the 13 months
18260225 1826 year, 02 month, 25 days after you subtract 30 days for the month of January

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