now = new Date(); 
twoweeksfromnow = new Date(now.getTime() + (3 * 24 * 60 * 60 * 1000)); 
months = new Array("January ","February ","March ","April ","May ","June ","July ","August ","September ","October ","November ","December "); 

document.write(" "   + months[twoweeksfromnow.getMonth()] + twoweeksfromnow.getDate() + "<br>");