Knockout date validation not working correctly

Question

I need to validate date in localized format (SK) and it is not possible with knockout validation.

I am using: Durandal 1.2.0 Knockout 2.3.0 Knockout validation https://g

Answer 1

Very late for this, but just want to share my updates on @ChoptimusPrime's answer. Not hard-coding the format:

ko.validation.rules['dateAndFormat'] = {
    validator: function (val, format) {
        return ko.validation.utils.isEmptyVal(val) || moment(val, format).isValid();
    },
    message: 'Please provide a valid date.'
};
ko.validation.registerExtenders();