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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 | | Uses calendar month method. Shows results from subtracting years first AND shows results subtracting days first, if different. | ||
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| [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 method or 30 day month method (8870 method) | | Has options to use calendar month method (subtracts days first) or 30 day month method (8870 method) | ||
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There are different ways to calculate a date from an age at death:<br> | There are different ways to calculate a date from an age at death:<br> | ||
*Calendar month method | *Calendar month method | ||
:*In addition the calendar month method can be done two ways: | :*In addition, the calendar month method can be done two ways: | ||
::*Subtract days first, then months and years | ::*Subtract days first, then months and years | ||
::*Subtract years first, then months and days | ::*Subtract years first, then months and days | ||
*30 day month method (also known as 8870 method) | *30 day month method (also known as 8870 method)<br> | ||
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This can be explained with this example: | ''This can be explained with this example:'' | ||
*Death date: 1 Apr 1870 | *Death date: 1 Apr 1870 | ||
*Age at death: 0 years 1 month, 4 days | *Age at death: 0 years 1 month, 4 days | ||
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*Calculators can be used to approximate a birth year from: 1) census data 2) birth date from wedding date and age. | *Calculators can be used to approximate a birth year from: 1) census data 2) birth date from wedding date and age. | ||
*Use either the Julian or Gregorian Calendar. Do not used the two together. | *Use either the Julian or Gregorian Calendar. Do not used the two together. | ||
*There is what is called a 30-day-month/or '''**8870''' method which assumes that all months have 30 days. As searchancestors.com says: "...many of the headstones and obituary ages at death appear to have been computed using this method. It's an approximation which agrees with the exact calendar month method about 2/3 of the time.)"<ref>[http://www.searchforancestors.com/utility/birthday.html Ancestor search]</ref> | *There is what is called a 30-day-month/or '''**8870''' method which assumes that all months have 30 days. As searchancestors.com says: "...many of the headstones and obituary ages at death appear to have been computed using this method. It's an approximation which agrees with the exact calendar month method about 2/3 of the time.)"<ref>Amy Larner Giroux, ''Skillbuilding: Date Calculations'' https://bcgcertification.org/skillbuilding-date-calculations/ accessed 30 June 2021;[http://www.searchforancestors.com/utility/birthday.html Ancestor search]</ref> | ||
*searchforancestors.com: "Because of the change from the Julian to the Gregorian Calendar, the calculator may not work for anyone born between Sept. 2, 1752 and Sept. 14, 1752 or when days were lost at the calendar changeover."<ref>[http://www.searchforancestors.com/utility/birthday.html Ancestor search]</ref> | *searchforancestors.com: "Because of the change from the Julian to the Gregorian Calendar, the calculator may not work for anyone born between Sept. 2, 1752 and Sept. 14, 1752 or when days were lost at the calendar changeover."<ref>[http://www.searchforancestors.com/utility/birthday.html Ancestor search]</ref> | ||
*The calendar was changed from the Julian to Gregorian calendar at some point in a country's history. Each country had a different date. Be sure to do the calculation with the correct calendar. Use this resource: [http://www.searchforancestors.com/utility/gregorian.html change from Julian to Gregorian calendar Dates by country].<ref>[http://www.searchforancestors.com/utility/birthday.html Ancestor search]</ref> | *The calendar was changed from the Julian to Gregorian calendar at some point in a country's history. Each country had a different date. Be sure to do the calculation with the correct calendar. Use this resource: [http://www.searchforancestors.com/utility/gregorian.html change from Julian to Gregorian calendar Dates by country].<ref>[http://www.searchforancestors.com/utility/birthday.html Ancestor search]</ref> | ||
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