DateExtensions.cs

DateExtensions.cs

public static class DateExtensions
{
        public static string TimeAgo(this DateTime date)
        {
            if (date <= DateTime.Now)
            {
                var timeSince = DateTime.Now.Subtract(date);
                if (timeSince.TotalMilliseconds < 1) return "not yet";
                if (timeSince.TotalMinutes < 1) return "just now";
                if (timeSince.TotalMinutes < 2) return "1 minute ago";
                if (timeSince.TotalMinutes < 60) return string.Format("{0} minutes ago", timeSince.Minutes);
                if (timeSince.TotalMinutes < 120) return "1 hour ago";
                if (timeSince.TotalHours < 24) return string.Format("{0} hours ago", timeSince.Hours);
                if (timeSince.TotalDays == 1) return "yesterday";
                if (timeSince.TotalDays < 7) return string.Format("{0} days ago", timeSince.Days);
                if (timeSince.TotalDays < 14) return "last week";
                if (timeSince.TotalDays < 21) return "2 weeks ago";
                if (timeSince.TotalDays < 28) return "3 weeks ago";
                if (timeSince.TotalDays < 60) return "last month";
                if (timeSince.TotalDays < 365)
                    return string.Format("{0} months ago", Math.Round(timeSince.TotalDays / 30));
                if (timeSince.TotalDays < 730) return "last year"; //last but not least...
                return string.Format("{0} years ago", Math.Round(timeSince.TotalDays / 365));
            }
            else
            {
                var timeUntil = date.Subtract(DateTime.Now);
                if (timeUntil.TotalMilliseconds < 1) return "not yet";
                if (timeUntil.TotalMinutes < 1) return "just now";
                if (timeUntil.TotalMinutes < 2) return "1 minute";
                if (timeUntil.TotalMinutes < 60) return string.Format("{0} minutes", timeUntil.Minutes);
                if (timeUntil.TotalMinutes < 120) return "1 hour";
                if (timeUntil.TotalHours < 24) return string.Format("{0} hours", timeUntil.Hours);
                if ((int)timeUntil.TotalDays == 1) return "tomorrow";
                if (timeUntil.TotalDays < 7) return string.Format("{0} days", timeUntil.Days);
                if (timeUntil.TotalDays < 14) return "next week";
                if (timeUntil.TotalDays < 21) return "in 2 weeks";
                if (timeUntil.TotalDays < 28) return "in 3 weeks";
                if (timeUntil.TotalDays < 60) return "next month";
                if (timeUntil.TotalDays < 365) return string.Format("{0} months", Math.Round(timeUntil.TotalDays / 30));
                if (timeUntil.TotalDays < 730) return "next year";
                return string.Format("in {0} years", Math.Round(timeUntil.TotalDays / 365));
            }
        }

        public static string ToString(this DateTime? date, string nullText, string format = "")
        {
            if (date.HasValue)
            {
                if (format.IsNullOrEmpty())
                    return date.Value.ToString();

                return date.Value.ToString(format);
            }

            return nullText;
        }

        public static DateTime StartOfWeek(this DateTime dt, DayOfWeek startOfWeek)
        {
            int diff = dt.DayOfWeek - startOfWeek;
            if (diff < 0)
            {
                diff += 7;
            }

            return dt.AddDays(-1 * diff).Date;
        }

        public static bool IsBetween(this DateTime date, DateTime firstDate, DateTime secondDate)
        {
            return (date >= firstDate && date <= secondDate) || (date <= firstDate && date >= secondDate);
        }

        public static bool IsValidSqlDateTime(this DateTime date)
        {
            return date.IsBetween((DateTime)System.Data.SqlTypes.SqlDateTime.MinValue, (DateTime)System.Data.SqlTypes.SqlDateTime.MaxValue);
        }
}