How to validate date taking leap year into account?

Question

How to validate date taking leap year into account?

Navigation

#1 by (9 votes)
#2 by (4 votes)
#3 by (4 votes)
#4 by (0 votes)

10

How to validate date with leap year in JavaScript?

javascript data

asked by anonymous 18.06.2014 / 13:35

4 answers

What are the for loop syntaxes in java? How to create a function to page dynamically created PHP page and change certain text

score 9 · Answer 1

Another way is to check which month falls on February 29 (February 29 or March 1?). If it is February the year is leap:

function anoBissexto(ano) {
    return new Date(ano, 1, 29).getMonth() == 1
}

Remembering that months range from 0 to 11 for the JavaScript Date object (month 1 is February).

score 4 · Answer 2

4

Hello, try this here:

function leapYear(year){
    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}

18.06.2014 / 14:12

score 4 · Answer 3

Date validation with javascript, also checks if the year is leap year.

<html>
<head>
<title>valida data</title>
<script>
function valData(data){//dd/mm/aaaa

day = data.substring(0,2);
month = data.substring(3,5);
year = data.substring(6,10);

if( (month==01) || (month==03) || (month==05) || (month==07) || (month==08) || (month==10) || (month==12) )    {//mes com 31 dias
if( (day < 01) || (day > 31) ){
    alert('invalid date');
}
} else

if( (month==04) || (month==06) || (month==09) || (month==11) ){//mes com 30 dias
if( (day < 01) || (day > 30) ){
    alert('invalid date');
}
} else

if( (month==02) ){//February and leap year
if( (year % 4 == 0) && ( (year % 100 != 0) || (year % 400 == 0) ) ){
if( (day < 01) || (day > 29) ){
    alert('invalid date');
}
} else {
if( (day < 01) || (day > 28) ){
alert('invalid date');
}
}
}

}
</script>
</head>
<body>
<form>
<input type="text" name="data" id="data" onBlur="return valData(this.value)" />
</form>
</body>
</html>

score 0 · Answer 4

Here is a function I did. It's simple and works in a way:

function ValidarData() {
    var aAr = typeof (arguments[0]) == "string" ? arguments[0].split("/") : arguments,
        lDay = parseInt(aAr[0]), lMon = parseInt(aAr[1]), lYear = parseInt(aAr[2]),
        BiY = (lYear % 4 == 0 && lYear % 100 != 0) || lYear % 400 == 0,
        MT = [1, BiY ? -1 : -2, 1, 0, 1, 0, 1, 1, 0, 1, 0, 1];
    return lMon <= 12 && lMon > 0 && lDay <= MT[lMon - 1] + 30 && lDay > 0;
}

ValidarData(31,12,2016) // True

or

ValidarData("29/02/2017") // False