I need a formula

V

Vercingetorix.XIII

that will look through 2 columns for a date and add the figures in another
column into a cell for that date.
example:

Dec name amount payment1 payment2
1st 100.00
5th client 100.00 dec1 jan 1
10th
20th
25th

Jan
1st 100.00
5th
 
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