javascript

A simple example of a JS date comparison size

**1, compare the date size of the js code **

<script>
var beginDate=$("#beginDate").val(); 
 var endDate=$("#endDate").val(); 
 var d1 = new Date(beginDate.replace(/-/g, "/")); 
 var d2 = new Date(endDate.replace(/-/g, "/")); 

  if(beginDate!=""&&endDate!=""&&d1 >=d2) 
 { 
  alert(" Start time must not be greater than end time! "); 
  return false; 
 }
 </script>

**2. Js compares the time and date size **

<html>  
<head>  
<title>calendar- Compare time and date sizes -www.jb51.net</title>  
<script type="text/javascript" src="CalendarFramework.js"></script>  
</head>  
<body>  
 Start time: <input onfocus="setday(this)" id="startTime" name="startTime"> to     
 End time: <input onfocus="setday(this)" id="endTime" name="endTime">  
          <input type="button" onclick="checkTime()" value=" check "/>  
          </body>  
<script type="text/javascript" >  
checkTime = function() {  
    var startTime = document.getElementById("startTime").value;  
    var endTime = document.getElementById("endTime").value;  
    compareCalendar(startTime, endTime);        
}  
//Compare day & noon;
function compareDate(checkStartDate, checkEndDate) {     
    var arys1= new Array();     
    var arys2= new Array();     
if(checkStartDate != null && checkEndDate != null) {     
    arys1=checkStartDate.split('-');     
      var sdate=new Date(arys1[0],parseInt(arys1[1]-1),arys1[2]);     
    arys2=checkEndDate.split('-');     
    var edate=new Date(arys2[0],parseInt(arys2[1]-1),arys2[2]);     
if(sdate > edate) {     
    alert(" Date start time is greater than end time ");        
    return false;        
}  else {  
    alert(" through ");  
    return true;     
    }  
    }     
}    

//Judge the date, the time & the size;
function compareTime(startDate, endDate) {  
 if (startDate.length > 0 && endDate.length > 0) {  
    var startDateTemp = startDate.split(" ");  
    var endDateTemp = endDate.split(" ");  

    var arrStartDate = startDateTemp[0].split("-");  
    var arrEndDate = endDateTemp[0].split("-");  

    var arrStartTime = startDateTemp[1].split(":");  
    var arrEndTime = endDateTemp[1].split(":");  

var allStartDate = new Date(arrStartDate[0], arrStartDate[1], arrStartDate[2], arrStartTime[0], arrStartTime[1], arrStartTime[2]);  
var allEndDate = new Date(arrEndDate[0], arrEndDate[1], arrEndDate[2], arrEndTime[0], arrEndTime[1], arrEndTime[2]);  

if (allStartDate.getTime() >= allEndDate.getTime()) {  
        alert("startTime Is not greater than endTime Cannot pass ");  
        return false;  
} else {  
    alert("startTime Less than endTime , so it passed ");  
    return true;  
       }  
} else {  
    alert(" Time cannot be empty ");  
    return false;  
      }  
}  
//Compare dates, time scales & NBSP;
function compareCalendar(startDate, endDate) {  
if (startDate.indexOf(" ") != -1 && endDate.indexOf(" ") != -1 ) {  
    //Includes time, date & NBSP;
        compareTime(startDate, endDate);              
} else {  
    //Contains no time, only date & NBSP;
    compareDate(startDate, endDate);  
      }  
}  
</script>  
</html>