Buckner's Birthdate Calculator

Calculates birthdate from death date and age of death in day/month/year format. Assumes New Year on January 1st. This version uses two different computation methods: (1) 30-day fixed-length months (the "8870" system is a variant of this), or (2) Calendar-length months.

Please see Ben Buckner's explanation of birthdate calculation methods. Keep in mind that due to uncertainty as to which calculation method was originally used and due to possible errors in the original calculation, calculated dates should be considered to be accurate only to within a few days unless you have good reason to be more confident in them. It is not unusual to encounter original calculation errors as large as one month, so beware!

This JavaScript utility uses tables, the forms interface, and JavaScript. As far as known, only Netscape after 2.0 and maybe a few more advanced browsers (like MS InternetExplorer) support this, and then only on some versions and platforms. Report any problems to Ben Buckner, but first make sure you're not just reading something wrong.

Calendar:

Month Length:

Enter date of death and age at death:

	Day	Month	Year
Death:
	Days	Months	Years
Age:

Born

To perform your calculation, click on this button: .

CGI Version

Page by Ben Buckner (his web site: enuxsa.eas.edu/~buckner). Birthdate Calculator text has been modified for SHARE by his permission with thanks.