Need number of months or weeks passed from formula

[Guest]

Hi,
I used the following formula to calculate the number of months passed
between two dates. Unfortunately, I need a little more accuracy than what
this provides. This formula results in full month calculations only. Is
there a way to get a more accurate calculation. I wouldn't even mind
calculating the number of weeks and dividing by 4.28 to arrive at number of
months, but I don't know the "name" for how to count weeks. The formula
won't accept "WEEK" as a name like it does for "MONTH".
=(YEAR(C2)-YEAR(B2))*12+MONTH(C2)-MONTH(B2) and it works to a point.

Thanks for any help. Diana
PS ... I posted this request in a reply to one of my own earlier postings
(which had a different original question) to "general" newsgroup, but I was
afraid it might get missed because it's not the original question. My
apologies if this is inappropriate posting behaviour.

 

[Frank Kabel]

Hi
use DATEDIF. See:
http://www.cpearson.com/excel/datedif.htm

 

[Daniel.M]

HI,

http://groups.google.com/groups?hl=fr&lr=&c2coff=1&[email protected]

Click on the "Complete Thread" link on that page.

HTH

Daniel M.

 

[Guest]

Hi Daniel, thanks for the response. I look through the thread and tried a
few of the examples (changing the cells, as appropriate, of course), but it's
not giving the correct results, so I'm not sure what I'm doing wrong. I'm
happy to have a month results of 4.3 or 4.5. I don't need exact number of
days, just the time that has lapsed. I'd even take weeks, then I could
convert to months or portion.

There's gotta be a way to do this.
Thanks again. Diana

 

[Ron Rosenfeld]

Hi,
I used the following formula to calculate the number of months passed
between two dates. Unfortunately, I need a little more accuracy than what
this provides. This formula results in full month calculations only. Is
there a way to get a more accurate calculation. I wouldn't even mind
calculating the number of weeks and dividing by 4.28 to arrive at number of
months, but I don't know the "name" for how to count weeks. The formula
won't accept "WEEK" as a name like it does for "MONTH".
=(YEAR(C2)-YEAR(B2))*12+MONTH(C2)-MONTH(B2) and it works to a point.

Thanks for any help. Diana
PS ... I posted this request in a reply to one of my own earlier postings
(which had a different original question) to "general" newsgroup, but I was
afraid it might get missed because it's not the original question. My
apologies if this is inappropriate posting behaviour.

Diana,

One problem with "exact" is that months vary in length.

Two suggestions:

1. To compute the number of weeks between your two dates:

=(C2-B2)/7

2. To compute months and days:

Months --> =DATEDIF(B2,C2,"m")
Remaining Days --> =DATEDIF(B2,C2,"md")


--ron

 

[Guest]

Thanks Ron, I'll play with it and let you know how it works out.
Diana

 

[Guest]

Ron,
It would appear that I don't know enough about these formulas to encorporate
your suggestion into my existing formula or I'm not sure what to replace.
I'm getting an "error", so I'm doing something wrong.

Any thoughts?

 

[Frank Kabel]

Hi
what is the exact formula you have tried and what error do you get?

 

[Guest]

Frank,
I think I figured it out (I don't give up all that easy, but didn't think
I'd figure it out).

What I didn't try from Ron's post is to use what he suggested to calculate
the number of weeks. I used that calculation, then divided by 4.28 (assume
that's correct to calculate number of months) an that seems to have solved my
formula woes. I used the week calculation because some the dates that I'm
using are from a different year. It appears (from what I've read) that month
calculations don't work correctly if they are not in the same year.

Here's Ron post. I simply used his 1. suggestion, then divided by 4.28 to
calculate the number of months. Does that sound about right to you?

One problem with "exact" is that months vary in length.
Two suggestions:
1. To compute the number of weeks between your two dates:
=(C2-B2)/7
2. To compute months and days:
Months --> =DATEDIF(B2,C2,"m")
Remaining Days --> =DATEDIF(B2,C2,"md")

 

[Ron Rosenfeld]

Ron,
It would appear that I don't know enough about these formulas to encorporate
your suggestion into my existing formula or I'm not sure what to replace.
I'm getting an "error", so I'm doing something wrong.

Any thoughts?

What error?

What formula? (I suggested two different approaches).


--ron