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==Tips | ===Tips=== | ||
*Be aware that some of these websites have other types of calculators with different functions, explanations and tips, with various kinds of information. | |||
*Be aware that some of these | |||
*Some calculators may require you to put a 0 in a box instead of leaving a box blank, also using a 0 in front of a single digit month may or may not be required. | *Some calculators may require you to put a 0 in a box instead of leaving a box blank, also using a 0 in front of a single digit month may or may not be required. | ||
*Due to possible errors or different methodology used in Calculated dates from original calculations. (found on the tombstone, obituary or death certificates) , please make a note in your records that the date was calculated.. | *Due to possible errors or different methodology used in Calculated dates from original calculations. (found on the tombstone, obituary or death certificates) , please make a note in your records that the date was calculated.. | ||
* | *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. | ||
*There is what is called a 30-day-month/or '''**8870''' method which assumes that all months have 30 days | *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> | ||
*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> | ||
==How to calculate by hand - Estimated date== | ==How to calculate by hand - Estimated date== | ||
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