danajao (9/7/2010)
Thanks for a very interesting tip ... problem I have though is while my expression provides me with a previous date ... it fails when moving into another month for example on September 1, 2010 I would expect the expression to evaluate to August 31, 2010, instead it evaluates to September 30, 2010 ... it handles the date difference within a given month correctly but not when the current month goes into the 2nd month ... just cant figure what the problem is... I'd appreciate your showing me where I'm going wrong ... Thanks.(DT_DATE) MONTH( DATEADD("mm", 0, GETDATE()) )> (DT_DATE) MONTH( DATEADD("mm", -1, GETDATE()) ) ?
"X:\\WNTS\\Reporting\\List28old "+ RIGHT( "0"+ (DT_WSTR, 2) MONTH( DATEADD("mm", 0, GETDATE()) ) , 2 ) + "-"+ RIGHT( "0"+ (DT_WSTR, 2) DAY( DATEADD("dd", -1, GETDATE()) ) , 2 ) + "-"+ (DT_WSTR, 4) YEAR( GETDATE() )+".csv" :
"X:\\WNTS\\Reporting\\List28old "+ RIGHT( "1"+ (DT_WSTR, 2) MONTH( DATEADD("mm", -1, GETDATE()) ) , 2 ) + "-"+ RIGHT( "0"+ (DT_WSTR, 2) DAY( DATEADD("dd", -1, GETDATE()) ) , 2 ) + "-"+ (DT_WSTR, 4) YEAR( GETDATE() )+".csv"
It looks from the code that you may be trying to code an expression for SSIS. If true, you may get more help in the SSIS forum. But meanwhile, at the core of it, finding a previous date can be trivial with the DATEADD function:
select DATEADD(dd,-1,'20100901')
returns 8/31/2010
You want to build the filename from pieces of that common result. Your problem may be that DATEADD("mm",0,GETDATE()) which I highlighted in my quote of your post above. It will alway give you the same month that you start with. Try making it DATEADD("mm",-1,GETDATE()) and let us know if that solves things for you.