Calculating days in a month

S

STFC

Hello,

Hope someone can help.

A1 = Start date B1=End Date eg A1 = 1st Jan B1=4th April

C1=Days in Jan D1=Days in Feb E1=Days in Mar etc until Dec.

Therefore for the above example C1 would = 31days D1 = 28days E1 = 31days
and F1 = 4 days.

I have been playing around with IF and DATEDIF but I'm getting nowhere. Any
help would be much appreciated.
 
B

Bob Phillips

C1: =DAY(DATE(YEAR(A1),MONTH(A1)+1,0))
D1: =DAY(DATE(YEAR(A1),MONTH(A1)+2,0))
E1: =DAY(DATE(YEAR(A1),MONTH(A1)+3,0))
--

HTH

RP
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S

Stefi

Format Cell C1 as dd and the formula: =EOMONTH(A1;0)

Stefi


„STFC†ezt írta:
 
S

STFC

Hi Bob

Wow, thanks for the quick response.

I was really after a formaula that would take into account partial months.

Therefore if Start Date = 15 Jan, End Date= 4th Apr

Jan=17 days, Feb=28days Mar= 31day and Apr=4 days, May=0, Jun=0 etc. This is
for when campaigns ran in a year, and which months it ran in.

Andy.
 
B

Bob Phillips

Are you looking for a more variable formula, or will the start and end dates
always span 4 months?

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
S

STFC

Sorry I haven't been that clear have I.

Yes a more variable formula - the campaigns can run for anything from a week
to a year.
 
B

Bob Phillips

Okay, another shot.

Assuming that the start date is in A1, end date is in B1, and the campaign
days are in C1:C12

In C1: =DATE(YEAR(A$1),MONTH(A$1)+1,1)-A1
Select all C2:C11 cells together, then enter this array formula into the
formula bar (commit with Ctrlo-Shift-Enter)
=IF(ROW(INDIRECT("2:100"))=MONTH($B$1),DAY($B$1),DAY(DATE(YEAR(A$1),MONTH(A$
1)+ROW(INDIRECT("2:100")),0))*(MONTH($B$1)>=ROW(INDIRECT("2:100"))))

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
B

Bob Phillips

You can actually do it all inj one formula,

Select C1:C12, and enter this formula, again as an array formula

=IF(ROW(INDIRECT("1:100"))=MONTH($A$1),DATE(YEAR(A$1),MONTH(A$1)+1,1)-A1,IF(
ROW(INDIRECT("1:100"))=MONTH($B$1),DAY($B$1),DAY(DATE(YEAR(A$1),MONTH(A$1)+R
OW(INDIRECT("1:100")),0))*(MONTH($B$1)>=ROW(INDIRECT("1:100")))))

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
B

Bob Phillips

Actually, this can be clarified as you are only running for up to one year
:), and there is a problem with the formula. It works okay if the campaign
starts in Jan, but any other month fails.

Amendment #3.

=IF(ROW(INDIRECT(MONTH($A$1)&":"&MONTH($A$1)+11))=MONTH($A$1),DATE(YEAR(A$1)
,MONTH(A$1)+1,1)-A1,IF(ROW(INDIRECT("1:12"))=MONTH($B$1),DAY($B$1),DAY(DATE(
YEAR(A$1),MONTH(A$1)+ROW(INDIRECT("1:12")),0))*(MONTH($B$1)>=ROW(INDIRECT("1
:12")))))

and still an array formula

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
S

STFC

Hi Bob,

This is v impressive. I have some learning to do.

This is close to working, but if the start date = 2nd Feb then Jan should
have 0 days. As start dates and end dates could be any dates in the year.
Also a campaign could just run in 1 month eg 8th Jan - 15th Jan which =8
days.

Also is it possible to do the array where C1:N1 return the results.

I feel I'm being a bit cheeky now, but thanks for all the help.
 
B

Bob Phillips

Can't resist another go, as it is still not right

=IF(ROW(INDIRECT(MONTH($A$1)&":"&MONTH($A$1)+11))=MONTH($A$1),DATE(YEAR(A$1)
,MONTH(A$1)+1,1)-A1,IF(ROW(INDIRECT(MONTH($A$1)&":"&MONTH($A$1)+11))=MONTH($
B$1)+(YEAR($B$1)-YEAR($A$1))*12,DAY($B$1),DAY(DATE(YEAR(A$1),MONTH(A$1)+ROW(
INDIRECT("1:12")),0))*(MONTH($B$1)+(YEAR($B$1)-YEAR($A$1))*12>=ROW(INDIRECT(
MONTH($A$1)&":"&MONTH($A$1)+11)))))

This works in all cases I can see except where the campaign starts and ends
in the same month. Getting a bit messy though.

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
B

Bob Phillips

I have done it so that C1 contains the month the campaign starts in, so Jan
is in C12 (that is next year).

I spotted the same month problem in my last post, but it can be fixed, as
long as the campaign doesn't go over a year). To use C1:N1, use this formula

=IF((MONTH($A$1)=MONTH($B$1))*(MONTH($A$1)=COLUMN(INDIRECT(MONTH($A$1)&":"&M
ONTH($A$1)+11))),$B$1-$A$1,IF(COLUMN(INDIRECT(MONTH($A$1)&":"&MONTH($A$1)+11
))=MONTH($A$1),DATE(YEAR(A$1),MONTH(A$1)+1,1)-A1,IF(COLUMN(INDIRECT(MONTH($A
$1)&":"&MONTH($A$1)+11))=MONTH($B$1)+(YEAR($B$1)-YEAR($A$1))*12,DAY($B$1),DA
Y(DATE(YEAR(A$1),MONTH($A$1)+COLUMN(INDIRECT("1:12")),0))*(MONTH($B$1)+(YEAR
($B$1)-YEAR($A$1))*12>=COLUMN(INDIRECT(MONTH($A$1)&":"&MONTH($A$1)+11))))))


--

HTH

RP
(remove nothere from the email address if mailing direct)
 
S

STFC

Hi Bob,

First time using this site, will definitely use it again. I'm quite glad I
was right in thinking this wasn't easy to solve.

The formula is v v impressive. The only problem is trying to get a campaign
that starts in Mar to return 0 for Jan and Feb. Would it be easier to have 12
separate formulas for C1:N1 to induvidually workout if they had days running
in that month?

Thanks again for all your help, much appreciated.
 
B

Bob Phillips

Hi STFC (sorry, don't know your name)

As long as the start date and end date are in the same year, and start month
will be less than end month, we can simplify the formula and get it the way
you want

=IF(AND(COLUMN(A1)>MONTH($A$1),COLUMN(A1)<MONTH($B$1)),DAY(DATE(YEAR($A$1),C
OLUMN(A1)+1,0)),IF(COLUMN(A1)=MONTH($A$1),DAY(DATE(YEAR($A$1),COLUMN(A1)+1,0
))-DAY($A$1),IF(COLUMN(A1)=MONTH($B$1),DAY($B$1),0)))

This is NOT an array formula, so just commit with Enter.

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
B

Bob Phillips

Damn, forgot the dates in the same month again.

=IF(AND(MONTH($A$1)=MONTH($B$1),COLUMN(A1)=MONTH($A$1)),$B$1-$A$1,IF(AND(COL
UMN(A1)>MONTH($A$1),COLUMN(A1)<MONTH($B$1)),DAY(DATE(YEAR($A$1),COLUMN(A1)+1
,0)),IF(COLUMN(A1)=MONTH($A$1),DAY(DATE(YEAR($A$1),COLUMN(A1)+1,0))-DAY($A$1
),IF(COLUMN(A1)=MONTH($B$1),DAY($B$1),0))))

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
S

STFC

Hi Bob,

the names Andy - I'll change my display name.

This is sooo close now. It works except for campaigns starting and finishing
in the same month. And eg 24th Feb to 10 Mar would return 4 days in Feb and
not 5.

This is making a lot more sense now though - thanks.

Andy
 
B

Bob Phillips

Hi Andy (nice to use names ;-)

I've fixed the same month problem in my last post.

For 24th Feb, are you saying that should be 5 days not 4? My test gives 4.

--

HTH

RP
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M

Myrna Larson

Here's another approach that will simplify the formulas. In C1:N1 put the
dates of the first of the months, i.e. Jan 1, 2005 through Dec 1, 2005. In
C2:N2, put the last day of each month, i.e. Jan 31, 2005, Feb 28, 2005, ...
Dec 31, 2005. (do that with a formula or literals).

Then, with the start date in A3 and the end date in B3, put this formula in C3

=MAX(MIN($B3,C$2)-MAX($A3,C$1),-1)+1

and copy it across through N3 and down for as many rows as you need.
 
A

Andy W

Sorry, I didn't see your last post before I posted my reply.

This is even closer now. The campign includes the day it satrts on. Using
your formaula. Start date: 1st Jan End Date: 1st Feb returns 30days for Jan.
For Feb: 24th 25th 26th 27th 28th = 5 days.

I believe there is an end in sight though. Thanks for all your help again.
 
B

Bob Phillips

Here we go. Amended to include the start date even if just one month

=IF(AND(MONTH($A$1)=MONTH($B$1),COLUMN(A1)=MONTH($A$1)),$B$1-$A$1+1,IF(AND(C
OLUMN(A1)>MONTH($A$1),COLUMN(A1)<MONTH($B$1)),DAY(DATE(YEAR($A$1),COLUMN(A1)
+1,0)),IF(COLUMN(A1)=MONTH($A$1),DAY(DATE(YEAR($A$1),COLUMN(A1)+1,0))-DAY($A
$1)+1,IF(COLUMN(A1)=MONTH($B$1),DAY($B$1),0))))

--

HTH

RP
(remove nothere from the email address if mailing direct)
 
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