添加项目文件。

QYZH.InteractiveMagazine.Common/Extensions/DateTimeExtension.cs

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+using System;
+
+namespace QYZH.InteractiveMagazine.Common.Extensions
+{
+    /// <summary>
+    /// 日期时间扩展方法
+    /// </summary>
+    public static class DateTimeExtension
+    {
+        /// <summary>
+        /// 转换为Unix时间戳(秒)
+        /// </summary>
+        /// <param name="dateTime">日期时间</param>
+        /// <returns>Unix时间戳</returns>
+        public static long ToTimestamp(this DateTime dateTime)
+        {
+            return new DateTimeOffset(dateTime.ToUniversalTime()).ToUnixTimeSeconds();
+        }
+
+        /// <summary>
+        /// 从Unix时间戳(秒)转换为DateTime
+        /// </summary>
+        /// <param name="timestamp">Unix时间戳</param>
+        /// <returns>日期时间</returns>
+        public static DateTime FromTimestamp(long timestamp)
+        {
+            return DateTimeOffset.FromUnixTimeSeconds(timestamp).LocalDateTime;
+        }
+
+        /// <summary>
+        /// 转换为指定格式的日期时间字符串
+        /// </summary>
+        /// <param name="dateTime">日期时间</param>
+        /// <param name="format">格式字符串,默认为"yyyy-MM-dd HH:mm:ss"</param>
+        /// <returns>格式化的日期时间字符串</returns>
+        public static string ToDateTimeString(this DateTime dateTime, string format = "yyyy-MM-dd HH:mm:ss")
+        {
+            return dateTime.ToString(format);
+        }
+
+        /// <summary>
+        /// 从生日计算年龄
+        /// </summary>
+        /// <param name="birthday">生日日期</param>
+        /// <returns>年龄</returns>
+        public static int GetAge(this DateTime birthday)
+        {
+            int age = DateTime.Now.Year - birthday.Year;
+
+            if (DateTime.Now.DayOfYear < birthday.DayOfYear)
+            {
+                age--;
+            }
+
+            return age;
+        }
+
+        /// <summary>
+        /// 判断是否是今天
+        /// </summary>
+        /// <param name="dateTime">日期时间</param>
+        /// <returns>是否是今天</returns>
+        public static bool IsToday(this DateTime dateTime)
+        {
+            return dateTime.Date == DateTime.Today;
+        }
+
+        /// <summary>
+        /// 获取当天开始时间(00:00:00)
+        /// </summary>
+        /// <param name="dateTime">日期时间</param>
+        /// <returns>当天开始时间</returns>
+        public static DateTime ToStartOfDay(this DateTime dateTime)
+        {
+            return dateTime.Date;
+        }
+
+        /// <summary>
+        /// 获取当天结束时间(23:59:59.999)
+        /// </summary>
+        /// <param name="dateTime">日期时间</param>
+        /// <returns>当天结束时间</returns>
+        public static DateTime ToEndOfDay(this DateTime dateTime)
+        {
+            return dateTime.Date.AddDays(1).AddTicks(-1);
+        }
+    }
+}