js验证日期是否正确

/**
* 验证日期是否正确
* 日期格式：yyyy-mm-dd，yyyy-m-d，yyyy/mm/dd，yyyy/m/d
*/
function checkDate(dateStr) {
dateStr = dateStr.replace(/\//g, '-');

var dateReg = /^(\d{4})-(\d{1,2})-(\d{1,2})$/;
var rValue = dateStr.match(dateReg);
if (rValue == null) {
return false;
}
rValue[1] = parseInt(rValue[1], 10);
rValue[2] = parseInt(rValue[2] - 1, 10);
rValue[3] = parseInt(rValue[3], 10);
var dateObj = new Date(rValue[1], rValue[2], rValue[3]);
if (dateObj.getFullYear() != rValue[1] || dateObj.getMonth() != rValue[2] || dateObj.getDate() != rValue[3]) {
return false;
}
return true;
}