nnstats will extract the collection (C) and expiration (X) entries from the log file and calculate total
and average number of articles, groups and elapsed time per day, per month, or for the duration of the
whole log file.
Normally only a summary for the specified period is printed. If -l is specified, the statistics for each
day in the period is also printed, and if -t is specified the summary is not printed.
Normally the statistics is collected for all days in the log files (or the current log file if one is not
specified).
If "-mmonth" is specified, the statistics for that month is calculated. The month is specified in
normal date notation, i.e. a capitalized three letter abbreviation like Jan, Feb, ...
If "-dmonthday" is specified, the statistics for that date only is calculated and printed.