Generate a report based on each month (not just the previous month)

Hello,

I have a question about an existing report I have.

Currently the report runs based upon the current date & subtracts 1 to get the last months date range.

It turns out my boss is NOT running the report on the 1st of each month as I told him he needed to for the results to be the previous months values.

As a result I now have to ask for your help in getting results filtered by each month and not just the last month from when I execute the report.

Ideally having the report run (whatever day I chose to run it) and it will generate each previous months Outage (for up to 12 months).

Would anyone be kind enough to help me with the sql query?

I believe the specific changes would have to impact the "eventtime between" line of code.

Here is how my current report looks in sql.

SELECT

    Nodes.Caption,

    StartTime.EventTime,

   DATEDIFF(Mi, StartTime.EventTime,

    (SELECT TOP 1

        EventTime

        FROM Events AS Endtime

        WHERE EndTime.EventTime > StartTime.EventTime AND EndTime.EventType = 5

            AND EndTime.NetObjectType = 'N'

            AND EndTime.NetworkNode = StartTime.NetworkNode

        ORDER BY EndTime.EventTime)) AS OutageDurationInMinutes

FROM Events StartTime INNER JOIN Nodes ON StartTime.NetworkNode = Nodes.NodeID

WHERE (StartTime.EventType = 1) AND (StartTime.NetObjectType = 'N') AND (nodes.caption like '%USRTAVIN%' OR nodes.caption like '%USRTRNYNY80%' OR nodes.caption like '%USRTRLACA001%') and

eventtime between  (DATEADD(m, DATEDIFF(m, 0, getdate()) -1 , 0)) AND (DATEADD(m, DATEDIFF(m, 0, getdate()) , 0))

--ORDER BY Nodes.Caption ASC

ORDER BY StartTime.EventTime ASC