How get a measure filter col as date

Hi all,

i want to get a Value from a query an the filter ist a date.

var lv_A_11 = DS_2.getDataAsString("00O2TL0YRWX9XYV2B3AA16C51", {"A00000149":"2013/08/08"});

i make the date: "08.08.2013" or "2013-08-08" or "2013/08/08"

all this doesn't work but in Design Studio "edit initial view" i see there is an value.

the 00O2TL0YRWX9XYV2B3AA16C51 and A00000149 are correct names

How is the format from the date? I think this is wrong.

who nows the correct "getDataAsString" format to get this value?

thanks

br harry