Hi
one way (assumption your payments are in column A):
=SUMPRODUCT((A1:A1000>=DATE(2004,1,1))*(A1:A1000<=DATE(2004,1,31))
to just count the payment occurences in January
=SUMPRODUCT((A1:A1000>=DATE(2004,1,1))*(A1:A1000<=DATE(2004,1,31),A1:A1
000)
to sum the payments in January