The below example gives prior and current month first and last day values.The code below dynamically formats the date to give you date range values for reporting:

[LFM-FirstDay] – First Day of thePrior Month or Last Full Month First Day,
[LFM-LastDay] – 11:59 PM of the last day of the prior month,
[CM-FirstDay] – Current Month First Day and
[CM-LastDay] – 11:59 PM of the last day of the Current month.

USE [dbofchoice]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE VIEW [DBO].[ReportDates]
AS
/*
LFM = LAST FULL MONTH
CM = CURRENT MONTH
*/
SELECT
DATEADD(month, -1 ,DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))
as [LFM-FirstDay]
,DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,getdate()),0))
as [LFM-LastDay]
,DATEADD(mm, DATEDIFF(m,0,getdate()),0)
as [CM-FirstDay]
,DATEADD(s,-1,DATEADD(mm, DATEDIFF(m,0,getdate())+1,0))
as [CM-LastDay]
GO