Date comparision in javascript + jquery

Question

I have this script piece in an javascript function to validate some fields in my form

var situacao = $("select[name='situacaoCRC']").val();
var dta_emissao = $("input[name='dtaEmissao']").val();
var dta_validade = $("input[name='dtaValidade']").val();

if (situacao == -1) {
    alert('Selecione um estado para o CRC.');
return false;
}

if (dta_emissao === undefined || dta_emissao === "") {
    alert('Data de emissão do CRC inválida.');
return false;
}

if (dta_validade === undefined || dta_validade === "") {
alert('Data de validade do CRC inválida.');
return false;
}

if (dta_validade <= dta_emissao) {
    alert('A data de validade do CRC deve ser posterior à data de emissão.');
return false;
}

The fields dta_validade and dta_emissao are both dates in the format DD/MM/YYYY

When i put in this fields, let's say, dta_validade = 01/12/2011 and dta_emissao = 01/01/2012 and, with this data, i get the alert in the 4th IF

Cros · Accepted Answer · 2011-12-29 14:07:12Z

2

You need to create 2 date objects, before you can compare them. You can find some information about it here: http://www.w3schools.com/js/js_obj_date.asp

var test_date1;
test_date = new Date(2011, 11, 1); //Year, Month (zero based), Day

(In this case you need to parse the values of the year, month and day yourself)

You can also use Datejs to make things easier for you: http://www.datejs.com

Or, seeing as you're already using jQuery, use the jQuery UI Datepicker: http://jqueryui.com/demos/datepicker/

$.datepicker.formatDate( format, date, settings ) 
// Format a date into a string value with a specified format.
$.datepicker.parseDate( format, value, settings ) 
// Extract a date from a string value with a specified format.

edited Dec 29, 2011 at 14:07

Cros

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answered Dec 29, 2011 at 11:56

Xuntar

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1 Comment

Xuntar Over a year ago

Thanks for the edit Cros, I always forget that Month is indeed zero based (from 0 [January] to 11 [December]).

Cros · Accepted Answer · 2011-12-29 12:15:03Z

1

You could change your last last if to:

if (parseDate(dta_validade) <= parseDate(dta_emissao)) {
    alert('A data de validade do CRC deve ser posterior à data de emissão.');
    return false;
}

Then you can add:

function parseDate(s) {
    var a = s.split('/');
    return new Date(parseInt(a[2]), parseInt(a[1])-1, parseInt(a[0])); // month is zero-based
}

Don't forget error handling.

answered Dec 29, 2011 at 12:15

Cros

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