using System;
using System.Globalization;
using System.Linq;
using System.Collections.Generic;

public class Test
{
    public static string GetReadableTimespan(TimeSpan ts)
        {
            const int SECOND = 1;
            const int MINUTE = 60 * SECOND;
            const int HOUR = 60 * MINUTE;
            const int DAY = 24 * HOUR;
            const int MONTH = 30 * DAY;
            double delta = Math.Abs(ts.TotalSeconds);

            if (delta < 0)
            {
                return "not yet";
            }
            if (delta < 1 * MINUTE)
            {
                return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago";
            }
            if (delta < 2 * MINUTE)
            {
                return "a minute ago";
            }
            if (delta < 45 * MINUTE)
            {
                return ts.Minutes + " minutes ago";
            }
            if (delta < 90 * MINUTE)
            {
                return "an hour ago";
            }
            if (delta < 24 * HOUR)
            {
                return ts.Hours + " hours ago";
            }
            if (delta < 48 * HOUR)
            {
                return "yesterday";
            }
            if (delta < 30 * DAY)
            {
                return ts.Days + " days ago";
            }
            if (delta < 12 * MONTH)
            {
                int months = Convert.ToInt32(Math.Floor((double)ts.Days / 30));
                return months <= 1 ? "one month ago" : months + " months ago";
            }
            else
            {
                int years = Convert.ToInt32(Math.Floor((double)ts.Days / 365));
                return years <= 1 ? "one year ago" : years + " years ago";
            }
        }

	public static void Main()
	{
       string[] strTimeSpans = new[]{"00hr:00min:17sec","00hr:03min:18sec","00hr:05min:25sec","01hr:39min:44sec"};
            TimeSpan[] timespans = strTimeSpans
                .Select(s => {
                    var parts = s.Split(':');
                    int hour = int.Parse(parts[0].Substring(0, 2));
                    int min = int.Parse(parts[1].Substring(0, 2));
                    int sec = int.Parse(parts[2].Substring(0, 2));
                    return new TimeSpan(hour, min, sec);
                }).ToArray();

            foreach (TimeSpan ts in timespans)
                Console.WriteLine(GetReadableTimespan(ts));
	}
}