MVC时间对比及时间范围判断

方法一：使用DateTime.Compare 方法

public static int Compare(
    DateTime t1,
    DateTime t2
)

t1 早于 t2：小于零
t1 与 t2 相同：零
t1 晚于 t2：大于零
示例：

DateTime ctime = Convert.ToDateTime("2013-07-14 04:00:00.000");
DateTime today = DateTime.Now;
DateTime.Compare(today,ctime)>

DateTime now = DateTime.Now;
var policypro = _db.PolicyProducts.SingleOrDefault(p => p.Status == true && DateTime.Compare(now,p.StartDate)>=&&DateTime.Compare(now,p.EndDate)<=);

方法二：直接用：!=,>,<,>=,<=进行对比

var item = _db.Pol.SingleOrDefault(createdate >= p.StartDate && createdate <= p.EndDate);