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|[http://freepages.rootsweb.com/~fgris/family/brown/agecalc.html Age Calculator] | |[http://freepages.rootsweb.com/~fgris/family/brown/agecalc.html Age Calculator] | ||
|Rootsweb | |Rootsweb | ||
| | | Used to calculate birthdate using date of death and age; calculate age of death with birthdate and death date; calculate death with only the year of birth and death. | ||
| Includes the exact calendar month method or the 30 day month method (8870 method) | |||
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| [http://www.searchforancestors.com/utility/age.html Ancestor Search Age Calculator] | | [http://www.searchforancestors.com/utility/age.html Ancestor Search Age Calculator] | ||
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| [http://longislandgenealogy.com longislandgenealogy.com] | | [http://longislandgenealogy.com longislandgenealogy.com] | ||
| Used to determine birthdate from age at death | | Used to determine birthdate from age at death | ||
| Uses 30 day month method | | Uses 30 day month method (8870 method) | ||
|- | |- | ||
|[https://www.timeanddate.com/date/dateadded.html Date Calculator] | |[https://www.timeanddate.com/date/dateadded.html Date Calculator] | ||
|[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 exact calendar month method and provides 30 day month method, if different. | ||
|- | |- | ||
| [http://www.searchforancestors.com/utility/birthday.html Tombstone Birthday Calculator] | | [http://www.searchforancestors.com/utility/birthday.html Tombstone Birthday Calculator] | ||
| [http://www.searchforancestors.com/ searchforancestors.com] | | [http://www.searchforancestors.com/ searchforancestors.com] | ||
| This calculator allows Julian calendar '''or''' Gregorian dates to help you calculate birth date from age at date of death. | | This calculator allows Julian calendar '''or''' Gregorian dates to help you calculate birth date from age at date of death. | ||
| Has options to use calendar month or 30 day month method | | Has options to use exact calendar month method or 30 day month method (8870 method) | ||
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==Calculating Dates Using Online Calculators== | ==Calculating Dates Using Online Calculators== | ||
There are two ways to calculate a date from an age at death:<br> | There are two ways to calculate a date from an age at death:<br> | ||
*30 day month method | *Exact calendar month method | ||
*30 day month method (also known as 8870 method) | |||
This can be explained with this example: | This can be explained with this example: | ||
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*Age at death: 5 years 10 months, 13 days, | *Age at death: 5 years 10 months, 13 days, | ||
*Two answers can be given: | *Two answers can be given: | ||
* | :*Exact calendar month method: 28 Apr 1864, | ||
*30 day month method: 30 Apr 1864 (matches 8870 method) | :*30 day month method: 30 Apr 1864 (matches 8870 method) | ||
===Which | ===Which Method Should be Used? === | ||
Although, the exact calendar month method may take into account the correct number days of the month, it is a common belief that the 30 day month method, which matches the '''8870''' hand method used for centuries before calculators were invented, is more likely to correspond to the accurate date of birth. <ref> searchforancestors.com ''Tombstone Birthday Calculator'', http://www.searchforancestors.com/utility/birthday.html, accessed 25 June 2021. Quote: "While you may think the calendar month method may be more reliable, be aware that many of the headstone and obituary ages at death appear to have been computed using the 30-day-month method. (The 30-day-month method assumes that all months have 30 days. It's an approximation which agrees with the calendar month method about 2/3 of the time.)"</ref> This 30 day month method would have been the easiest way for the individual to calculate the date for the tombstone inscription. | |||
===Tips=== | ===Tips=== | ||
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