$(function(){
var starttime= -1;
var endtime = -1;
var ontime = new date();
var ontime = new date(new date(ontime).tolocaledatestring()).gettime();
if(ontime >= starttime && ontime < endtime){
  $("html").css("filter","grayscale(1)");
  $("html").css("-webkit-filter","grayscale(100%)");
  $("html").css("-moz-filter","grayscale(100%)");
  $("html").css("-ms-filter","grayscale(100%)");
  $("html").css("-o-filter","grayscale(100%)");
  $("html").css("filter","progid:dximagetransform.microsoft.basicimage(grayscale=1)");
}
})