DateAdd函数：
function DateAdd(interval,number,date){
switch(interval.toLowerCase()){
case "y": return new Date(date.setFullYear(date.getFullYear()+number));
case "m": return new Date(date.setMonth(date.getMonth()+number));
case "d": return new Date(date.setDate(date.getDate()+number));
case "w": return new Date(date.setDate(date.getDate()+7*number));
case "h": return new Date(date.setHours(date.getHours()+number));
case "n": return new Date(date.setMinutes(date.getMinutes()+number));
case "s": return new Date(date.setSeconds(date.getSeconds()+number));
case "l": return new Date(date.setMilliseconds(date.getMilliseconds()+number));
}
}
DateDiff函数：
function DateDiff(interval,date1,date2){
var long = date2.getTime() - date1.getTime(); //相差毫秒
switch(interval.toLowerCase()){
case "y": return parseInt(date2.getFullYear() - date1.getFullYear());
case "m": return parseInt((date2.getFullYear() - date1.getFullYear())*12 + (date2.getMonth()-date1.getMonth()));
case "d": return parseInt(long/1000/60/60/24);
case "w": return parseInt(long/1000/60/60/24/7);
case "h": return parseInt(long/1000/60/60);
case "n": return parseInt(long/1000/60);
case "s": return parseInt(long/1000);
case "l": return parseInt(long);
}
}
兼容多浏览器的
datediff函数
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