Does anyone know how to use the countif (or a correct funtion) to count the
number of times a "time value" shows up in a series?

For example, the series J1-J100 is made of up time formated fields. The
fields have 1:03AM, 2:15AM, 4:15PM, etc in them. I want to count how many
times 1:**AM shows up in the series.

I am guessing it is something like countif(J1:J100, "1*AM"), but that
doesn't seem to work.

Any ideas?