Unity 获取两个时间的相差多少天

/// <summary>
        /// 获取两个时间的相差多少天
        /// </summary>
        /// <param name="startTimer"></param>
        /// <param name="endTimer"></param>
        /// <returns></returns>
        public static int GetSubDays(DateTime startTimer, DateTime endTimer)
        {
            TimeSpan startSpan = new TimeSpan(startTimer.Ticks);

            TimeSpan nowSpan = new TimeSpan(endTimer.Ticks);

            TimeSpan subTimer = nowSpan.Subtract(startSpan).Duration();

            //返回相差时长（返回相差的总天数）
            return (int)subTimer.TotalDays;
        }