Convert Month Number to Month name in design studio 1.6

HI Experts,

I  am capturing Variable value in text box on top of landing page i have calendar year as a variable .i have in 003 2015 . format .my requirement is to convert oo3 in march i have worked  in 1.3   i believe there is no cast or date function .i am not sure about 1.6 .

var a = DS_2.getVariableValueText("PA_V_A_MM_YYYY");

LINE.setText("mEUR:" +a);

DS_2.loadDataSource();

I Have gone through below discussions but  doesnt full fill my requirement.could any guide me on this?

Design Studio 1.3 Scripting Example to Convert String Number to Date

Convert String to Date - DS 1.2

Get month from APPLICATION.GETINFO().DATENOW

Any reply really appreciated

Thanks,

varun