Hello. First of all, great plugin.
Only problem I've run across is filtering by date sometimes gives some unexpected results. I suspect this is an issue with the version of PHP I'm using, but I'm stuck with what's installed.
The following examples assume today's date (Jan 11).
Specifically I want a report that shows activity for last calendar month (December, in this case). One would think this would be: filter="submit_time>last month". However that gives you everything from December 11 - Jan 11.
Also tried: filter="submit_time>=first day of last month&&submit_time<=last day of last month" however these variations are rejected as invalid.
Can anyone suggest a workaround for this?