UPDATE. It looks like I should use moment for the check as defined in this answer:

http://stackoverflow.com/questions/7445328/check-if-a-string-is-a-date-value


Hi everybody,

This is the original code written by my colleague

if ((typeof val === "object") && (val !== null)) {
                        if (val instanceof Date) {
                            var yyyy = val.getFullYear().toString();
                            var mm = (val.getMonth() + 1).toString(); // getMonth() is zero-based
                            var dd = val.getDate().toString();
                            var HH = val.getHours().toString();
                            var MM = val.getMinutes().toString();
                            var SS = val.getSeconds().toString();
                            jsonval.value = (mm[1] ? mm : "0" + mm[0]) + '/' + (dd[1] ? dd : "0" + dd[0]) + '/' + yyyy + ' ' + (HH[1] ? HH : "0" + HH[0]) + ':' + (MM[1] ? MM : "0" + MM[0]) + ':' + (SS[1] ? SS : "0" + SS[0]); // padding
                        }
                        else {
                            jsonval = val;
                        }
                    }
                    else {
                        jsonval = JSON.parse(val);
                    }

and this is a re-write by another colleague

if (_.isDate(val)) {
                jsonval.value = moment(val).format("MM/DD/YYYY HH:mm:ss");
            }

            else if (_.isObjectLike(val)) {
                jsonval = val;
            }

            else {
                jsonval = JSON.parse(val);
            }

which doesn't work. The val is passed as "7/10/2010" but the first check and the second check return false and then JSON.parse produces an error. Do you think instanceof is better to use?

Thanks in advance.