Calculating Date of next birthday

[Ken Lumley]

Perhaps a strange type of request however I have a list of 500 birthdates
and I need to calculate 30 days before the next birthday for each and
display that as a date. I'm using excel 2003 for windows and excel 2004 for
mac.

I can calculate the age as at the next birthday in years and of course the
current age. What I can't seem to figure out how to do is calculate the date
of the next birthday.

Any help would be most appreciated.

Thanks

[Ken Lumley]

On 22/12/08 2:52 PM, in article C5755A40.4CAE%klu...@lwb.org.au, "Ken
Lumley" <klu...@lwb.org.au> wrote:

Sorry all, I had a blank moment. The answer is relatively simple for anyone
who may be interested:

=((DATEDIF(F4,TODAY(),"y")+1)*365.25)+F4-30 where F4 contains the date of
birth

[David Biddulph]

I think you'll find that you'll often be a day out with that formula. As an
example, try it out with 1st Jan of various years as the DoB (and you may
want to remove the -30 term for the test to make it clearer).

Try =DATE(YEAR(F4)+(DATEDIF(F4,TODAY(),"y")+1),MONTH(F4),DAY(F4))-30
--
David Biddulph

"Ken Lumley" <klu...@lwb.org.au> wrote in message
news:C5755ED2.4CB4%klu...@lwb.org.au...

[s.suganthi]

calcuate the age from 2 different dates

Ken Lumley wrote:

Calculating Date of next birthday
21-Dec-08

Thanks

Previous Posts In This Thread:

On Sunday, December 21, 2008 11:52 PM
Ken Lumley wrote:

Calculating Date of next birthday

Thanks

On Monday, December 22, 2008 12:12 AM
Ken Lumley wrote:

Re: Calculating Date of next birthday

On 22/12/08 2:52 PM, in article C5755A40.4CAE%klu...@lwb.org.au, "Ken
Lumley" <klu...@lwb.org.au> wrote:

Sorry all, I had a blank moment. The answer is relatively simple for anyone
who may be interested:

=((DATEDIF(F4,TODAY(),"y")+1)*365.25)+F4-30 where F4 contains the date of
birth

On Monday, December 22, 2008 1:33 AM
David Biddulph wrote:

I think you'll find that you'll often be a day out with that formula.
I think you'll find that you'll often be a day out with that formula. As an
example, try it out with 1st Jan of various years as the DoB (and you may
want to remove the -30 term for the test to make it clearer).

Try =DATE(YEAR(F4)+(DATEDIF(F4,TODAY(),"y")+1),MONTH(F4),DAY(F4))-30
--
David Biddulph

"Ken Lumley" <klu...@lwb.org.au> wrote in message
news:C5755ED2.4CB4%klu...@lwb.org.au...

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[Bob Phillips]

=IF(DATE(YEAR(A2),MONTH(A2),DAY(A2))>TODAY(),
DATE(YEAR(TODAY()),MONTH(A2),DAY(A2)),
DATE(YEAR(TODAY())+1,MONTH(A2),DAY(A2)))-30

--

HTH

Bob Phillips

(replace xxxx in the email address with gmail if mailing direct)

<s. suganthi> wrote in message news:2009111634...@yahoo.co.in...

[rolwey...@googlemail.com]

I went a slightly different route.

This is based on putting the persons date of birth i.e. 1/1/1980 in B4 and depending on todays date working out if the birthday is this year or next and adding the appropriate year


=IF(DATEVALUE((DAY(B4)&"/"&MONTH(B4)&"/"&YEAR(TODAY())))>TODAY(),DAY(B4)&"/"&MONTH(B4)&"/"& (YEAR(TODAY())),DAY(B4)&"/"&MONTH(B4)&"/"&YEAR(TODAY())+1)

If it works for you then grand.

[Auric__]

rolwey.stats wrote:

> I went a slightly different route.

Okay, but... the original post was 8 years ago.

--
Goddammit grad school, you're making me overanalyze funny pictures of cats.

[vima...@gmail.com]

=EDATE(A1,CEILING.MATH(YEARFRAC(A1,TODAY()),1)*12)-30

where A1 is the birthdate