js日期函数

<script type="text/javascript">
//替换字符串
function Replace(str, from, to) {
return str.split(from).join(to);
}
// 日期类型格式成指定的字符串
function FormatDate(date, format) {
format = Replace(format, "yyyy", date.getFullYear());
format = Replace(format, "MM", GetFullMonth(date));
format = Replace(format, "dd", GetFullDate(date));
format = Replace(format, "HH", GetFullHour(date));
return format;
}
//js日期字符串转换成日期类型
function parseDate(dateStr) {
return new Date(Replace(dateStr, "-", "/"));
}
//增加月
function AddMonths(date, value) {
date.setMonth(date.getMonth() + value);
return date;
}
//增加天
function AddDays(date, value) {
date.setDate(date.getDate() + value);
return date;
}
//增加时
function AddHours(date, value) {
date.setHours(date.getHours() + value);
return date;
}
//返回月份(两位数)
function GetFullMonth(date) {
var v = date.getMonth() + 1;
if (v > 9) return v.toString();
return "0" + v;
}

//返回日(两位数)
function GetFullDate(date) {
var v = date.getDate();
if (v > 9) return v.toString();
return "0" + v;
}
//返回时(两位数)
function GetFullHour(date) {
var v = date.getHours();
if (v > 9) return v.toString();
return "0" + v;
}
//比较两个时间
function compareDate() {
var mydate = AddDays(parseDate("2012-08-23"), 1);
var nowdate = new Date();
if (nowdate.getTime() < mydate.getTime()) {
return FormatDate(nowdate, "yyyy-MM-dd");
}
return FormatDate(mydate, "yyyy-MM-dd");
}
</script>