日期验证 - 代码示例 - W3CAPI 在线教程

源代码

<!DOCTYPE html>
<head>
<meta charset="utf-8" />
<title>js 示例</title> 
</head> 
<body>
<script type="text/javascript">
function validatedate(inputText)
  {
  var dateformat = /^(0?[1-9]|1[012])[\/\-](0?[1-9]|[12][0-9]|3[01])[\/\-]\d{4}$/;
  // Match the date format through regular expression
  if(inputText.value.match(dateformat))
  {
  document.form1.text1.focus();
  //Test which seperator is used '/' or '-'
  var opera1 = inputText.value.split('/');
  var opera2 = inputText.value.split('-');
  lopera1 = opera1.length;
  lopera2 = opera2.length;
  // Extract the string into month, date and year
  if (lopera1>1)
  {
  var pdate = inputText.value.split('/');
  }
  else if (lopera2>1)
  {
  var pdate = inputText.value.split('-');
  }
  var mm  = parseInt(pdate[0]);
  var dd = parseInt(pdate[1]);
  var yy = parseInt(pdate[2]);
  // Create list of days of a month [assume there is no leap year by default]
  var ListofDays = [31,28,31,30,31,30,31,31,30,31,30,31];
  if (mm==1 || mm>2)
  {
  if (dd>ListofDays[mm-1])
  {
  alert('Invalid date format!');
  return false;
  }
  }
  if (mm==2)
  {
  var lyear = false;
  if ( (!(yy % 4) && yy % 100) || !(yy % 400)) 
  {
  lyear = true;
  }
  if ((lyear==false) && (dd>=29))
  {
  alert('Invalid date format!');
  return false;
  }
  if ((lyear==true) && (dd>29))
  {
  alert('Invalid date format!');
  return false;
  }
  }
  }
  else
  {
  alert("Invalid date format!");
  document.form1.text1.focus();
  return false;
  }
  }

</script>
</body>
</html>

运行结果

W3CAPI 实例工具箱