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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>Amy Larner Giroux, ''Skillbuilding: Date Calculations'' | *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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