Count frequency of set hour ranges from large list of times

I have a large list of date/time stamps (over 8000). I am just concerned with the time portions. I need to summarize how many records appeared within a certain hour block.
Example:

Hour / Frequency
04:00-04:59 / 200
05:00-05:59 / 150
06:00-06:59 ...
19:00-19:59
08:00-08:59
09:00-09:59
10:00-10:59
11:00-11:59
12:00-12:59

Attached is a sample of the data (just 100 records) I am working with. This is part of a much larger spreadsheet so I mainly need the correct formula(s). My range of date/times I need to work from is listed in tab "times" column B. The hour ranges I need to count can be found in tab "frequency".