C# 时间工具类

将DateTime.Now转换成cstTime，解决在linux与windows中相差8个小时的问题

 /// <summary>
        /// 将DateTime.Now转换成cstTime，解决在linux与windows中相差8个小时的问题
        /// </summary>
        /// <param name="time"></param>
        /// <returns></returns>
        public static DateTime ToCstTime(this DateTime time)
        {
            return GetCstDateTime(time);
        }

        private static DateTime GetCstDateTime(DateTime time)
        {
            //Instant now = SystemClock.Instance.GetCurrentInstant();
            Instant instant = Instant.FromDateTimeUtc(time.ToUniversalTime());
            var shanghaiZone = DateTimeZoneProviders.Tzdb["Asia/Shanghai"];
            return instant.InZone(shanghaiZone).ToDateTimeUnspecified();
        }

DateTime时间格式转换为Unix时间戳格式,精确到毫秒

        /// <summary>  
        /// DateTime时间格式转换为Unix时间戳格式,精确到毫秒
        /// </summary>  
        /// <param name="time"> DateTime时间格式</param>  
        /// <returns>Unix时间戳格式</returns>  
        public static long ToUnixTimestamp(this System.DateTime time)
        {
            System.DateTime startTime = TimeZone.CurrentTimeZone.ToLocalTime(new System.DateTime(1970, 1, 1));
            return (long)(time - startTime).TotalMilliseconds;
        }

Unix时间戳转为C#格式时间

        /// <summary>  
        /// Unix时间戳转为C#格式时间  
        /// </summary>  
        /// <param name="timeStamp">Unix时间戳格式,例如1482115779</param>  
        /// <returns>C#格式时间</returns>  
        public static DateTime GetTime(this System.DateTime time, string timeStamp)
        {
            DateTime dtStart = TimeZone.CurrentTimeZone.ToLocalTime(new DateTime(1970, 1, 1));
            long lTime = long.Parse(timeStamp + "0000000");
            TimeSpan toNow = new TimeSpan(lTime);
            return dtStart.Add(toNow);

        }

获取日期之间的天数

        /// <summary>
        /// 获取日期之间的天数
        /// </summary>
        /// <param name="dateStart"></param>
        /// <param name="dateEnd"></param>
        /// <returns></returns>
        public static int DateDiff(DateTime dateStart, DateTime dateEnd)
        {
            DateTime start = Convert.ToDateTime(dateStart.ToShortDateString());
            DateTime end = Convert.ToDateTime(dateEnd.ToShortDateString());
            TimeSpan sp = end.Subtract(start);
            return sp.Days;
        }