1.日期时间字符串验证
DateTime applicationDatetime = new DateTime();
bool applicationDate = DateTime.TryParse("2019-09-18 11:00", out applicationDatetime);
applicationDate = true;//正确日期格式
DateTime applicationDatetime = new DateTime();
bool applicationDate = DateTime.TryParse("2019-09-18 11", out applicationDatetime);
applicationDate = false;//错误日期格式
