excel - Sumif Function involving dates and text -

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i have 3 columns contain range of dates, ie 6/15/2013, corresponding items ie. gravel, asphalt etc , corresponding tonnages. need able sum of tonnages of asphalt per month.

i have tried several sumif statements coming no value. going fine until tried add sorting month "if" statement.

any appreciated.

sample data below

column | column b | column c  6/23/2013| asphalt  |    12  7/14/2013| asphalt  |    14  6/15/2013| gravel   |    15  8/15/2013| gravel   |    18  6/3/2013 | asphalt  |    14

thanks

if have excel 2007 or later try using sumifs, e.g. in f2

=sumifs(c:c,b:b,"asphalt",a:a,">="&e2,a:a,"<"&eomonth(e2,0)+1)

where column contains dates, b items , c tonnages....and e2 should contain 1st of month want sum. can add more more dates in e3 down , copy formula down


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