public static string ToRelative(this DateTime target)
{
target = target.ToUniversalTime();
ArgValidator.IsNotInFuture(target, "target");
ArgValidator.IsNotInvalidDate(target, "target");
StringBuilder result = new StringBuilder();
TimeSpan diff = (DateTime.UtcNow - target.ToUniversalTime());
Action <int, string> format = (v, u) =>
{
if (v > 0)
{
if (result.Length > 0)
{
result.Append(", ");
}
string plural = (v > 1) ? "s" : string.Empty;
result.Append("{0} {1}{2}".FormatWith(v, u, plural));
}
};
if (diff.TotalDays > 365)
{
var year = (int)(diff.TotalDays / 365);
format(year, "year");
diff = diff.Subtract(TimeSpan.FromDays(year * 365));
}
format(diff.Days, "day");
format(diff.Hours, "hour");
format(diff.Minutes, "minute");
return((result.Length == 0) ? "few moments" : result.ToString());
}
public static string FormatWith(this string target, params object[] args)
{
ArgValidator.IsNotEmpty(target, "target");
return(string.Format(CultureInfo.CurrentCulture, target, args));
}
