JavaScript Tutorial/Regular Expressions/Date

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Use Regular Expression to validate date

   <source lang="javascript">

<html> <head> <title>Date Example</title> <script type="text/javascript"> 

   function isValidDate(sText) {
       var reDate = /(?:0[1-9]|[12][0-9]|3[01])\/(?:0[1-9]|1[0-2])\/(?:19|20\d{2})/;
       return reDate.test(sText);
   }
   function validate() {
       var oInput1 = document.getElementById("txt1");
       if (isValidDate(oInput1.value)) {
           alert("Valid");
       } else {
           alert("Invalid!");
       }
   }

</script> </head> <body>

Date: <input type="text" id="txt1" />
example: 05/05/2005
<input type="button" value="Validate" onclick="validate()" />

</body> </html></source>


Validate the Date

   <source lang="javascript">

<HTML> <HEAD> <SCRIPT> function checkDate(testStr) { 

  var pattern = /\b(\d{2})\/(\d{2})\/(\d{4})\b/;
  var result = testStr.match(pattern);
  if (result != null)
     return "Well done.";
  else
     return "You didn"t input a date in the specified pattern.";

} </SCRIPT> </HEAD> <BODY> Check a date format today! <FORM name="theForm"> Enter a date in mm/dd/yyyy format: <INPUT type=text name=testStr size=20 maxlength=10> <INPUT type=button 

      name="theButton" 
      value="Verify the Format"    
      onClick="alert(checkDate(document.theForm.testStr.value))";>

</FORM> </BODY> </HTML></source>

Источник — «http://wbex.ru/index.php?title=JavaScript_Tutorial/Regular_Expressions/Date&oldid=9881»