Count occurrences of dates

[George Gee]

Column A is a list of dates with the format 01/01/2000, 30/04/2001 etc.
How would I count the number of occurrences of dates in column A
for the month of say January 2000

How would I count the number of occurrences of dates for the year 2000

Great If you can help.

George Gee

 

[barry houdini]

Hello George,

For January 2000 you could use a formula like

=SUMPRODUCT(--(TEXT(A1:A100,"mmmyyyy")="Jan2000"))

for the whole year

=SUMPRODUCT(--(YEAR(A1:A100)=2000))

extend the range as necessary but you can't use the whole column
unless you have Excel 2007

 

[George Gee]

Hi Barry

Thanks for your reply
The first part for the month works fine.
The second part for the year, I'm getting #VALUE!

Only 4500 rows

Thanks again
George Gee

 

[Bernard Liengme]

Barry's formula is interesting. I would have used
=SUMPRODUCT(--(YEAR(A1:A100)=2000),--(MONTH(A1:A100)=1))
You can see how this is similar to
=SUMPRODUCT(--(YEAR(A1:A100)=2000))

Odd that one works and the other does not. I wonder if one or more cells do
not have real dates.
You say you have 4500 rows. What is the result from =COUNT(A1:A4500) ? If
every cell has a real date value, the result should be 4500.
best wishes

 

[barry houdini]

YEAR function will fail if any entry in the range is text that can't
be coerced to a number, if row 1 has a header then exclude that row.

If that still doesn't work you could try TEXT again, i.e.

=SUMPRODUCT(--(TEXT(A1:A100,"yyyy")="2000"))

but you may want investigate whether you have some entries that should
be dates but are, in fact, text

 

[George Gee]

Hi Bernard

Thanks for your reply, I've got it sorted now, hundreds of entries
that are just a letter "a", I'm replacing these gradually with a date.

Thanks again
George Gee

 

[George Gee]

Hi Barry

Thanks for this, very many entries just a letter "a".
Your most recent formula does the trick.

Thanks again
George Gee

 

[Bernard Liengme]

We learn something every day. Thanks, Barry

 

[Shane Devenshire]

Hi,

You could use a pivot table for this with the Date field in the Row area and
as a count in the Data area. Then group the row area by month and year.

 

[Shane Devenshire]

Hi,

By the way the pivot table solution will automatically detect text date
verses real dates and group them differently, alerting you to a problem.

Also the pivot table automatically will run subtotals by year and month.
The month subtotals will automatically appear as the count. To add the year
subtotal select the year field in the pivot table and choose Pivot Table,
Subtotals.