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datediff = function(date1, date2, interval) {
var delta = 1;
switch(interval) {
case "day":
delta /= 24;
case "hour":
delta /= 60;
case "minute":
delta /= 60;
case "second":
delta /= 1000;
case "millisecond":
delta *= date2.getTime() - date1.getTime();
}
return Math.round(delta);
};
var diff = datediff(new Date("2012-04-28T14:30:00Z"), new Date("2012-04-29T14:30:00Z"), "day");
for (var i = 0; i < 50; i++) {
diff = datediff(new Date("2012-04-28T17:00:00Z"), new Date("2012-04-28T17:30:00Z"), "minute");
assertEq(diff, 30);
}