I am using the following formula to count the number of entries by month in a
log.
=SUMPRODUCT(--(MONTH(DATA!A2:A2019)=1))
All of the other months sum correctly except month 1 which counts all
January entries and then all blank cells in the range--that is, cells A1600
to A2019 are blank, waiting for future date entries.

Ideas, suggestions, help--all welcome here!