Min
If you base your report on a query, you can use a parameter in the criterion
for the date field.
This pre-supposes that your underlying data has a date field.
If you include a "field" in your query something like:
ReportMonth: Month([YourDateField])
and put a parameter prompt in the criterion, something like:
[Enter Month Number (e.g., 1-12)]
your query will prompt for a month number, then find the rows where the date
field's "month" matches.
Please note! -- January is January is month "1", no matter WHICH year it
happens. Are you certain you only need to prompt for a "month"?
When your query is working as you wish (i.e., returning the data you
expect), create a report based on that query.