几个常用的日期函数

/* -- 计算两个字符(YYYY-MM-DD)的日期相隔天数 -- */

function Date_Compare(asStartDate,asEndDate){

var miStart = Date.parse(asStartDate.replace(/\-/g, '/'));

var miEnd = Date.parse(asEndDate.replace(/\-/g, '/'));

return (miEnd-miStart)/(1000*24*3600);

}

/*-- 判断一个字符串(YYYY-MM-DD)的日期是否正确 -- */

function Date_istrue(asDate){

var lsDate = asDate + "";

var loDate = lsDate.split("-");

if (loDate.length!=3) return false;

var liYear = parseInt(loDate[0]);

var liMonth = parseInt(loDate[1]);

var liDay = parseInt(loDate[2]);

if ((loDate[0].length>4)||(loDate[1].length>2)||(loDate[2].length>2)) return false;

if (isNaN(liYear)||isNaN(liMonth)||isNaN(liDay)) return false;

if ((liYear<1900)||(liYear>3000)) return false;

if ((liMonth>12)||(liMonth<=0)) return false;

if (Date_getDay(liYear,liMonth)<liDay) return false;

return !isNaN(Date.UTC(liYear,liMonth,liDay));

}

/*-- 返回某年某月的天数-- */

function Date_getDay(aiYear,aiMonth){

var loDay = [0,31,28,31,30,31,30,31,31,30,31,30,31];

if (aiYear%4==0) loDay[2] = 29;

return loDay[aiMonth];

}