Custom Calc Script for Drop Down Box selection value

i have drop down list called "effectivedate" 12 items (1/1/16; 2/1/16; 3/1/16 ... 12/1/16).  need number of pay periods left in year based on effective date populate in text field.  can see why custom calculation script not working? 

 

var v = this.getfield("effectivedate").value;

if (v=="1/1/16") event.value = 26;

else if (v=="2/1/16") event.value = 24;

else if (v=="3/1/16") event.value = 22;

else if (v=="4/1/16") event.value = 20;

else if (v=="5/1/16") event.value = 18;

else if (v=="6/1/16") event.value = 16;

else if (v=="7/1/16") event.value = 14;

else if (v=="8/1/16") event.value = 11;

else if (v=="9/1/16") event.value = 9;

else if (v=="10/1/16") event.value = 7;

else if (v=="11/1/16") event.value = 5;

else if (v=="12/1/16") event.value = 3

else event.value = "";

 

**note:  i'm using export values different purpose, can't use them this.

if have export values in drop-down values you'll when access value property, not display values.

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