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Check for Valid Date using JavaScript
Ivin Raj S
May 15, 2020
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Check for valid date using JavaScript. below is the full code.
Check for valid date using JavaScript. below is the full code.
<
head
id
=
"Head1"
runat
=
"server"
>
<
title
>
Untitled Page
</
title
>
<
script
language
=
"javascript"
type
=
"text/javascript"
>
// Declaring valid date character, minimum year and maximum year
var
dtCh
=
"/"
;
var
minYear
=
1900
;
var
maxYear
=
2100
;
function isInteger(s) {
var i;
for (
i
=
0
; i
<
s.length
; i++) {
// Check that current character is number.
var
c
=
s
.charAt(i);
if (((c
<
"0") || (c
>
"9"))) return false;
}
// All characters are numbers.
return true;
}
function stripCharsInBag(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) {
// February has 29 days in any year evenly divisible by four,
// EXCEPT for centurial years which are not also divisible by 400.
return (((year %
4
== 0) && ((!(year %
100
== 0)) || (year %
400
== 0))) ? 29 : 28);
}
function DaysArray(n) {
for (var
i
=
1
; i
<
= n; i++) {
this[i] = 31
if (
i
== 4 ||
i
== 6 ||
i
== 9 ||
i
== 11) { this[i] = 30 }
if (
i
== 2) { this[i] = 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
= strDay.substring(1)
if (strMonth.charAt(0) == "0" && strMonth.length
>
1)
strMonth
strMonth
= strMonth.substring(1)
for (var
i
=
1
; i
<
= 3; i++) {
if (strYr.charAt(0) == "0" && strYr.length
>
1)
strYr
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(stripCharsInBag(dtStr, dtCh)) == false) {
alert("Please enter a valid date")
return false
}
return true
}
function ValidateForm() {
var dt;
dt
=
document
.getElementById('txtDate');
if (isDate(dt.value) == false) {
dt.focus()
return false
}
return true
}
</
script
>
</
head
>
<
body
>
<
form
id
=
"form2"
runat
=
"server"
>
<
div
>
<
asp:TextBox
ID
=
"txtDate"
runat
=
"server"
>
</
asp:TextBox
>
<
asp:Button
ID
=
"Button1"
runat
=
"server"
Text
=
"Button"
OnClientClick
=
"ValidateForm()"
/>
</
div
>
</
form
>
</
body
>
Check for Valid Date using JavaScript
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