Macro: Find Duplicate Values & Sum Values. Per Day Basis

I have data that looks like this:

day# id amount
1 56575 0
1 56675 0
1 56680 0
1 56683 0
1 56681 0
1 51810 0..............

How do you write an excel macro that looks at the number in the first column (day #) and finds all the duplicate id#s in the second column that are in day 1and adds the amounts together in the 3rd column then writes the first column number (day#), second column number(id#) and the third column (sum of the amounts of duplicate Id#) to an new worksheet. Then the macro would loop through day #2 and do the same thing. Notice that the values in the id column are unique in this data set below this is how I would like the data to look. I have accomplished this in a pivot table but my problem is I need a cvs file to export the final data into an external database which is why I need a macro.....