如何在 Javascript 中检查日期范围

Question

在下面的代码中，我想验证 02/08/2017 到 05/08/2017 之间的日期，并向我们发出日期不在范围内的警报

<script type="text/javascript">
        function validate()
        {

        today = new Date();
        fromdt= new Date("02/08/2017");
        todate=new Date("05/08/2017");

        if( document.myForm.entrydt.value == "" )
           {
             alert( "Please Select Entry Date!" );
             document.myForm.entrydt.focus() ;
             return false;
           }
           else if(!document.myForm.entrydt.value.match(letters3))
          {
          alert("Entry Date: Enter Only Date Format i.e DD/MM/YYYY");
          document.myForm.entrydt.focus() ;
                return false;
            }
            else if (!document.myForm.entrydt.value.today > startdt && !document.myForm.entrydt.value.today < todate)
            {
            alert("Entry Date: Enter Date in Proper Range");
          document.myForm.entrydt.focus() ;
                return false;
            }
        return( true );
        }
        </script>

=================================================== ===========================

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" class="form-inline" role="form" name="myForm" id="myForm" onsubmit="return(validate());">
        <div id="" class="container" >
                            <div class="form-group">
                                <label for="entrydt">Entry Date</label>=
                                <input class="form-control" style='font-weight:bold;text-transform:uppercase;' id="entrydt" type="text" name="entrydt" style='' placeholder="DD/MM/YYYY" value="" size="10">
                            </div>
            </div> 
        </form>

Answer 1

new Date().getTime() 将给出以毫秒为单位的时间作为长值数字来比较值

var today = new Date().getTime(); // 1501653935994
var from = new Date("02/08/2017").getTime(); // gives 1486492200000
var to = new Date("05/08/2017").getTime();

if(today >= from && today <= to) {
   // your code goes here
}

Answer 2

new Date().getTime()

为您提供以毫秒为单位的时间戳。

var today = new Date().getTime();
var from = new Date("02/08/2017").getTime();
var to = new Date("05/08/2017").getTime();
var withinRange = today >= from && today <= to;