js 日期和年月进行比较

js获取当前日期：

var ayear = new Date().getFullYear(); // 获取当前年
var amonth = new Date().getMonth() + 1; //获取当前月
var aday = new Date().getDate(); //获取当前天

1：js对年月进行比较

var jhny = "";
var ayear = new Date().getFullYear();
var amonth = new Date().getMonth() + 1;
var adate = new Date((ayear + "-" + amonth + "-01").replace("-", "/"));
for (var z = 0; z < trs.length; z++) {
    if (trs[z].cells[7].getElementsByTagName("INPUT")[0].value != "") {
        var aadate = new Date((trs[z].cells[7].getElementsByTagName("INPUT")[0].value + "-01").replace("-", "/"));
        if (aadate < adate) {
            if (jhny == "") {
                jhny = 1;
            } else {
                jhny = jhny+","+(z+1);
            }
        }
    }
}
    if (jhny!="") {
    alert("第"+jhny+"行收入年月不能小于当前年月！！");
    return false;
}

2:C#获取几天几号

int day = Convert.ToInt32(DateTime.Now.ToString("dd"));
if (day > 15)
{
     //大于15号需要做的处理  
}