据说是最牛的日期验证正则表达式

String.prototype.isDate = function()
{
 //最强的日期检测正则，像某月存不存在某日也可以检测出来
 var result = this.match(/^(?:(?:1[6-9]|[2-9]\d)?\d{2}[\/\-\.](?:0?[1,3-9]|1[0-2])[\/\-\.](?:29|30))(?: (?:0?\d|1\d|2[0-3])\:(?:0?\d|[1-5]\d)\:(?:0?\d|[1-5]\d)(?: \d{1,3})?)?$|^(?:(?:1[6-9]|[2-9]\d)?\d{2}[\/\-\.](?:0?[1,3,5,7,8]|1[02])[\/\-\.]31)(?: (?:0?\d|1\d|2[0-3])\:(?:0?\d|[1-5]\d)\:(?:0?\d|[1-5]\d)(?: \d{1,3})?)?$|^(?:(?:1[6-9]|[2-9]\d)?(?:0[48]|[2468][048]|[13579][26])[\/\-\.]0?2[\/\-\.]29)(?: (?:0?\d|1\d|2[0-3])\:(?:0?\d|[1-5]\d)\:(?:0?\d|[1-5]\d)(?: \d{1,3})?)?$|^(?:(?:16|[2468][048]|[3579][26])00[\/\-\.]0?2[\/\-\.]29)(?: (?:0?\d|1\d|2[0-3])\:(?:0?\d|[1-5]\d)\:(?:0?\d|[1-5]\d)(?: \d{1,3})?)?$|^(?:(?:1[6-9]|[2-9]\d)?\d{2}[\/\-\.](?:0?[1-9]|1[0-2])[\/\-\.](?:0?[1-9]|1\d|2[0-8]))(?: (?:0?\d|1\d|2[0-3])\:(?:0?\d|[1-5]\d)\:(?:0?\d|[1-5]\d)(?: \d{1,3})?)?$/);
 if(result==null)
  return false
 else return true;
}