Datetime增加Between方法

Falcon.SugarApi/DateTimeExtend.cs

@@ -137,6 +137,18 @@ namespace Falcon.SugarApi
         public static string ToDateTime(this DateTime date) => date.ToString("yyyy-MM-dd HH:mm:ss");
 
         #endregion
+
+        /// <summary>
+        /// 时间是否处于某个时间段内
+        /// </summary>
+        /// <param name="dt">要判断的时间</param>
+        /// <param name="start">开始时间</param>
+        /// <param name="end">结束时间</param>
+        /// <returns>True是，False否</returns>
+        public static bool Between(this DateTime? dt,DateTime start,DateTime? end = null) {
+            end ??= DateTime.Now;
+            return dt > start && dt <= end;
+        }
     }
 
     /// <summary>