sql server - Case With Datepart For Weekday -

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any ideas wrong following code?

i trying write case statement returns today's date on monday else takes max date table if today's date inst monday

thanks 

select  case [effectivedate] when datepart(weekday,getdate()) = 1  cast(getdate() date) else max ([effectivedate]) end, [arcdal01pr].[arctimeseries].[arc_ts_data].[pricecurvedata] [curvename] = 'g_h_ttf.eur' 

select  case [effectivedate] when datepart(weekday,getdate()) = 2 cast(getdate() date) else max ([effectivedate]) end, [arcdal01pr].[arctimeseries].[arc_ts_data].[pricecurvedata] [curvename] = 'g_h_ttf.eur

monday should 2nd day of week. u can try if using sql server 2012

select  case [effectivedate] when weekday(getdate(),2) = 1  cast(getdate() date) else max ([effectivedate]) end, [arcdal01pr].[arctimeseries].[arc_ts_data].[pricecurvedata] [curvename] = 'g_h_ttf.eur

update

select  case when datepart(weekday,getdate()) = 2 cast(getdate() date) else max ([effectivedate]) end [effectivedate] [arcdal01pr].[arctimeseries].[arc_ts_data].[pricecurvedata] [curvename] = 'g_h_ttf.eur'

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