How to calculate the
date
of birth
From Platte Co, MO
Historical/Genealogical
Society
In the event you don't have a
computer close at hand to do the calculating:
REMEMBER
8870
That's not an error: It's the
number to remember
when you want to find the
birthdate
of someone
when you only have the date of
death and age.
How do you figure the
birthdate?
Suppose the
person died May 6, 1889,
at the age of 71 years, 7
months,
9 days.
- Write the year, month, day
as:->18890506
- Subtract the age at
death:------->710709
- This gives the
figure:--------->18179797
- Now subtract
8870:----------------->8870
- The result
is:----------------->18170927
Year 1817, 9th month (Sept),
27th
day or 27 Sept, 1817
©2000 by Tina
Hursh