C# convert mm/dd/yyyy string to "5 minute(s) ago"

this is how utube does it:



For a forum-kinda thing I wanted to (C#) convert mm/dd/yyyy string to "5 minute(s) ago" - like Youtube does.

Here's how u I did it:
(please feel free to comment, get me a better way to do this :D)

/// < summary>
/// transform into "9 hours ago" or "8 days ago" etc ...
/// < /summary>
/// < param name="makeThisNiceDateFormat">some date string ... "mm/dd/yyyy"< /param>
/// < returns >example: "5 minute(s) ago"< /returns>
public static string ConvertDateToHoursAgo(string makeThisNiceDateFormat)
{
if (!IsDate(makeThisNiceDateFormat))
{
return makeThisNiceDateFormat;
}
else
{
DateTime dtOriginal = DateTime.Parse(makeThisNiceDateFormat);
//check if we need to display minutes
if (Math.Abs(DateDiff(DateInterval.Minute, dtOriginal, DateTime.Now)) < 60)
{
if (DateDiff(DateInterval.Minute, dtOriginal, DateTime.Now) == 0)
{
return "just now";
}
return (Math.Abs(DateDiff(DateInterval.Minute, dtOriginal, DateTime.Now)) + " minute(s) ago");
}
//check if we need to display hours
if (Math.Abs(DateDiff(DateInterval.Hour, dtOriginal, DateTime.Now)) < 24)
{
return Math.Abs(DateDiff(DateInterval.Hour, dtOriginal, DateTime.Now)) + " hour(s) ago";
}
//check if we need to display days
if (Math.Abs(DateDiff(DateInterval.Day, dtOriginal, DateTime.Now)) < 31)
{
return Math.Abs(DateDiff(DateInterval.Day, dtOriginal, DateTime.Now)) + " day(s) ago";
}
//check if we need to display months
if (Math.Abs(DateDiff(DateInterval.Month, dtOriginal, DateTime.Now)) < 12)
{
return Math.Abs(DateDiff(DateInterval.Month, dtOriginal, DateTime.Now)) + " month(s) ago";
}
return Math.Abs(DateDiff(DateInterval.Year, dtOriginal, DateTime.Now)) + " year(s) ago";
}
}

thoughts?
Note: I got an IsDate function in there which returns true/false ... in case someone tries to send me something that is not a date ...