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function getDateArray(endDate, splitTime, count) {
if(!endDate) {
endDate = new Date();
}
if(!splitTime) {
splitTime = 5 * 60 * 1000;
}
if(!count) {
count= 12;
}
var endTime = endDate.getTime();
var mod = endTime % splitTime;
if(mod > 0) {
endTime -= mod;
}
var dateArray = [];
while(count-- > 0) {
var d = new Date();
d.setTime(endTime - count * splitTime);
dateArray.push(d);
}
return dateArray;
}
var a = getDateArray();
alert(a.length)
for(var i in a) {
alert(a[i]);
}