检查日期是否在过去的Javascript中

Question

全部,我正在使用日期选择器的jQuery UI.我试图用javascript检查,但用户输入的日期是过去的.这是我的表单代码:

<input type="text" id="datepicker" name="event_date" class="datepicker">

那么我如何用Javascript检查这一点以确保它不是过去的日期？谢谢

Answer 1

$('#datepicker').datepicker().change(evt => {
  var selectedDate = $('#datepicker').datepicker('getDate');
  var now = new Date();
  now.setHours(0,0,0,0);
  if (selectedDate < now) {
    console.log("Selected date is in the past");
  } else {
    console.log("Selected date is NOT in the past");
  }
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"></script>
<input type="text" id="datepicker" name="event_date" class="datepicker">

Answer 2

var datep = $('#datepicker').val();

if(Date.parse(datep)-Date.parse(new Date())<0)
{
   // do something
}