Converting Google spreadsheet date into a JS Date object?

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To convert a Google spreadsheet date to a javascript date :

var JSdate = Date.parse(Cell.getValue())

To convert a javascript date to a Google spreadsheet date:

function GoogleDate( JSdate ) { 
   var D = new Date(JSdate) ;
   var Null = new Date(Date.UTC(1899,11,30,0,0,0,0)) ; // the starting value for Google
   return ((D.getTime()  - Null.getTime())/60000 - D.getTimezoneOffset()) / 1440 ;
}

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