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==Tips for Using Date Calculators == | |||
* Be aware that some of these Websites have other types of calculators with different functions, explanations and tips, with various kinds of information. So check out the rest of the page. (The following examples are what you might find for tips) | |||
* 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.. | |||
* The calculator could also be used to calculate birth year from census data or birth date from wedding date and age. | |||
* When calculating Dates using the Julian or Gregorian Calendar you can't use the two together. | |||
* There is what is called a 30-day-month/or '''**8870''' method which assumes that all months have 30 days, 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> | |||
* Be aware the calendar was changed from Julian to Gregorian in which ever country for which you are performing the calculation. See the [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 == | |||
When the online calculator is not available, use the '''**8870 formula''' or the 30 day month length <ref>[http://www.searchforancestors.com/utility/birthday.html Search for ancestors]</ref> | |||
For example: | |||
If a person died May 6, 1889 at age 71 years, 7 months and 9 days: | |||
18890506 | |||
Year, day, month of death (yyyymmdd) | |||
1889--05--06 | |||
-710709 Subtract age at death (yymmdd) 71yr-07mo-09dd | |||
_________ | |||
18179797 | |||
-Subtract constant 8870 | |||
________ | |||
18170927 Born 27 Sept. 1817 (yyyymmdd) | |||
1817yr-09mo-27dd | |||
This person was born on September 27, 1817 | |||
==References== | |||
<references/> | |||
[[Category:Research analysis and instruction]] | [[Category:Research analysis and instruction]] | ||
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