处理当前时间跟历史时间，显示相对时间

给定一个特定DateTime值，我如何显示相对时间，例如：

• 2小时前
• 3天前
• 一个月前

 

 

学到一个方法，巧妙的对比 

      public static string RelativeDate(DateTime theDate)
        {
            string result = string.Empty;
            Dictionary<long, string> thresholds = new Dictionary<long, string>();
            int minute = 60;
            int hour = 60 * minute;
            int day = 24 * hour;
            thresholds.Add(60, "{0} seconds ago");
            thresholds.Add(minute * 2, "a minute ago");
            thresholds.Add(45 * minute, "{0} minutes ago");
            thresholds.Add(120 * minute, "an hour ago");
            thresholds.Add(day, "{0} hours ago");
            thresholds.Add(day * 2, "yesterday");
            thresholds.Add(day * 29, "{0} days ago");
            thresholds.Add(day * 30, "{0} month ago");
            thresholds.Add(day * 30 * 12, "{0} months ago");
            thresholds.Add(day * 30 * 12 * 2, "a year ago");
            thresholds.Add(long.MaxValue, "{0} years ago");
            long since = (DateTime.Now.Ticks - theDate.Ticks) / 10000000;
            foreach (long threshold in thresholds.Keys)
            {
                if (since < threshold)
                {
                    TimeSpan t = new TimeSpan((DateTime.Now.Ticks - theDate.Ticks));
                    return string.Format(thresholds[threshold], (t.Days > 365 ? t.Days / 365 : (t.Days > 30 ? t.Days / 30 : (t.Hours > 0 ? t.Hours : (t.Minutes > 0 ? t.Minutes : (t.Seconds > 0 ? t.Seconds : 0))))).ToString());
                }
            }
            return "";
        }