help me. please! how can i calculate the date of birth if i know a person's age at march 31, 2013. e.g. a person was 39.05 years old on march 31, 2013. what was their date of birth if A1 is 39.05 years old? what is the formula i should use? please.
Hi and Welcome to JustAnswer.com
Are you using Excel 2007 or 2010 version?
i believe it is 2010
sorry. itis 2007
Try using this formula please:
Make sure the format of the cell is "Date"
that formula is for the age of 39.05 being TODAY.
Age 39.05 should be in A1
and the cell in which you put this formula should be in Date(Right click > Format cells > Choose date)
yes, but the age of 39.05 is as of march 31, 2013 which is 9 days ago. the formula you are giving me is for the age of 39.05 being today.
You can replace today with 3/31/2013
ah. ok. let me try it. so the forumla should be:
I need to modify it a bit, give me some time please
If you replace today with the date it will not work I guess, need to analyze it
what i did was add .05 to 39.05 and then used today
My bad, its working
So if the persons age is 39.05 on 31-Mar
the formula should be
ok. hold on so the formula should be
No it will give an error
It should be in this format
where J5 contains the 31-Mar-2013 date and F11 contains the age
as of that date
sorry. not following.
Ok, lets say cell A1 contains 39.05 which is the age as of 31-Mar
oh hold on i get it now. let me try
no, wait. i have one cell with the age being the value of 39.05 on march 31.
i think i need to just add the .05 to get 39.1 and then use the "Today" formula to get the date of birth and then take the date of birth to generate new numbers based on "Today" going forward.
you can do that but adding 0.05 will only work if the age is of Mar-31 only
moreover, it may not be accurate for some cases
yes that is the age for march 31 only.
so how do i get
But I will suggest you to use the date directly
you are suggesing i use this:
you recommended i used this formula:
but my value is 39
my value is only one cell
i do not have two cells
I will tell you how to do that
one cell only.39.05 which represents the age on march 31, 2013
Try this formula
A1 contains the age
ok. a1 contains age. hold on.
hmmm. it is on average about ten days different from my attempt at adding .05 to the 39.05 and using the "Today" formula.
this is maddening.
It can't be totally accurate, do you want it like that?
i guess it will have to do.
unless you can think of anything else.
how did you arrive at the =(41364-A1*365.25) forumla?
calculating age from dob is different but vice versa can't be 100% accurate
ok. well if that is as good as it gets. i guess it will have to do.
41364 is the numeric format of 31-Mar-2013 date
definitely better than nothing i guess
where did you find that?
it makes sense now.
what do i do now?
this is the first time i have used this service.
you found the numeric value of march 21, 2013 where in excel?
just type the date into a cell in excel
and format it to numeric value
general or number without decimals
WOW. got it.
most of the people try to convert DOB to age :)
your requirement is quite unique
hope you are happy with my help. ;)
i know. but i work in HR and i have the AGES of employees and have to figure out their date of birth in the absense of that information from a company that my company is acquiring.
and i thought i didnt know how to use excel. NO ONE knows how.
everyone PRETENDS to know how.
i freely admit i do not know how to do something, but seem to be more capable than some people.
how do i pay for this?
Got it, yes you are
I can see that
You can use the smiley buttons below to rate me.
ok. where are you located btw? i am in vancouver
I will try to find something to convert age to DOB more accurately
If I get anything, I will reply here.
oh. do you think you could?
I am located in Bangalore, India :-)
reply here. will it get forwarded to me?
I will try. Since dates don't follow a symmetrical pattern, this problem arises
yes, you will get a notification in your email
wow. that would be greatly appreciated. thank you for your help