JavaScript Tutorial/Regular Expressions/Date
Use Regular Expression to validate date
<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>
<P>Date: <input type="text" id="txt1" /><br />
example: 05/05/2005<br />
<input type="button" value="Validate" onclick="validate()" /></p>
</body>
</html>
Validate the Date
<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>