JS decision selection time can not be less than the current time sample code _javascript tips

Copy Code code as follows:

var controldate;
function Checkdate () {
controldate= document.getElementById ("Senddate"). Value;
if (controldate== "") {
Alert (' Date cannot be empty ');
return false;
}else{
var day = new Date (); var year = 0;
var Month = 0;
var day = 0;
var currentdate = "";
Initialization time
Year = Day.getfullyear ();
Month = Day.getmonth () +1;
Day = Day.getdate ();

currentdate + + "-";

if (Month >= 10)
{
currentdate + + Month + "-";
}
Else
{
currentdate + + "0" + Month + "-";
}
if (Day >= 10)
{
currentdate = day;
}
Else
{
currentdate + = "0" + day;
}//alert (currentdate);/Current date

var startdate = new Date (Currentdate.replace ("-", ",")). GetTime ();
var enddate = new Date (Controldate.replace ("-", ",")). GetTime (); if (StartDate > EndDate)
{
Alert (' Select date cannot be less than the current date! ');
document.getElementById ("Senddate"). focus ();
return false;
}else{
return true;
}
}
}