Returns a string representation of this datetime. If the value is close to now, a relative description is returned. - CSharp System

CSharp examples for System:DateTime Format

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Description

Returns a string representation of this datetime. If the value is close to now, a relative description is returned.

Demo Code


using System;/*from  ww  w.  ja v  a2  s .c om*/

public class Main{
        /// <summary>
        /// Returns a string representation of this date/time. If the
        /// value is close to now, a relative description is returned.
        /// </summary>
        public static string ToRelativeString(this DateTime dt)
        {
            TimeSpan span = (DateTime.UtcNow - dt);

            // Normalize time span
            bool future = false;
            if (span.TotalSeconds < 0)
            {
                // In the future
                span = -span;
                future = true;
            }

            // Test for Now
            double totalSeconds = span.TotalSeconds;
            if (totalSeconds < 0.9)
            {
                return "now";
            }

            // Date/time near current date/time
            string format = (future) ? "in {0} {1}" : "{0} {1} ago";
            if (totalSeconds < 55)
            {
                // Seconds
                int seconds = Math.Max(1, span.Seconds);
                return String.Format(format, seconds,
                    (seconds == 1) ? "second" : "seconds");
            }

            if (totalSeconds < (55 * 60))
            {
                // Minutes
                int minutes = Math.Max(1, span.Minutes);
                return String.Format(format, minutes,
                    (minutes == 1) ? "minute" : "minutes");
            }
            if (totalSeconds < (24 * 60 * 60))
            {
                // Hours
                int hours = Math.Max(1, span.Hours);
                return String.Format(format, hours,
                    (hours == 1) ? "hour" : "hours");
            }

            // Format both date and time
            if (totalSeconds < (48 * 60 * 60))
            {
                // 1 Day
                format = (future) ? "tomorrow" : "yesterday";
            }
            else if (totalSeconds < (3 * 24 * 60 * 60))
            {
                // 2 Days
                format = String.Format(format, 2, "days");
            }
            else if (dt.Year == DateTime.Now.Year)
            {
                // Absolute date
                format = dt.ToString(@"\o\n MMM d");
            }
            else
            {
                format = dt.ToString(@"\o\n MMM d, yyyy");
            }

            // Add time
            return String.Format("{0} at {1:HH:mm}", format, dt);
        }
}

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