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how to validate date, like is date?
provide links if possible
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Hi Satish,
You can use the below function to validate Date,
<script language = "Javascript">
// Declaring valid date character, minimum year and maximum year
var dtCh= "/index.html";
var minYear=1800;
var maxYear=2500;
// Check that date is in number.
function isInteger(s)
{
var i;
for (i = 0; i < s.length; i++){
var c = s.charAt(i);
if (((c < "0") || (c > "9"))) return false;
}
return true;
}
function CheckValid(s, bag){
var i;
var returnString = "";
// Search through string's characters one by one.
// If character is not in bag, append to returnString.
for (i = 0; i < s.length; i++){
var c = s.charAt(i);
if (bag.indexOf(c) == -1) returnString += c;
}
return returnString;
}
function daysInFebruary (year)
{
return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
for (var i = 1; i <= n; i++) {
this = 31
if (i==4 || i==6 || i==9 || i==11) {this = 30}
if (i==2) {this = 29}
}
return this
}
function isDate(dtStr){
var daysInMonth = DaysArray(12)
var pos1=dtStr.indexOf(dtCh)
var pos2=dtStr.indexOf(dtCh,pos1+1)
var strMonth=dtStr.substring(0,pos1)
var strDay=dtStr.substring(pos1+1,pos2)
var strYear=dtStr.substring(pos2+1)
strYr=strYear
if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
for (var i = 1; i <= 3; i++) {
if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
}
month=parseInt(strMonth)
day=parseInt(strDay)
year=parseInt(strYr)
if (pos1==-1 || pos2==-1){
alert("The date format should be : mm/dd/yyyy")
return false
}
if (strMonth.length<1 || month<1 || month>12){
alert("Please enter a valid month")
return false
}
if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
alert("Please enter a valid day")
return false
}
if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
return false
}
if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(CheckValid(dtStr, dtCh))==false){
alert("Please enter a valid date")
return false
}
return true
}
function ValidateForm(){
var dt=document.frmSample.txtDate
if (isDate(dt.value)==false)
{
dt.focus()
return false
alert("Invalid");
}
else
{
alert("Valid");
}
return true
}
</script>
Please let me know if you have any doubts.
Regards,
Valli
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sathish_chennai
