using System;
using System.Collections.Generic;
using System.Text;

class Program {
    static void Main(string[] args) {
        DateTime dt = new DateTime(2004, 10, 17);
        dt.AddMonths(2);  // Month is now December.
        Console.WriteLine("Daylight savings: {0}", dt.IsDaylightSavingTime());
    }
}

    

   
 

using System;
using System.Globalization;

class MainClass {
    public static void Main() {
        
        Console.WriteLine("Current Date and Time: {0}", DateTime.Now.ToString());
        Console.WriteLine("Current Date Only: {0}", DateTime.Today.ToString());

    }
}

    

//Microsoft Public License (Ms-PL)
//http://visualizer.codeplex.com/license
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Redwerb.BizArk.Core.DateExt
{

///

public static class DateExt
{

///

/// ///
public static string ToRelativeTimeString(this DateTime value)
{
const int SECOND = 1;
const int MINUTE = 60 * SECOND;
const int HOUR = 60 * MINUTE;
const int DAY = 24 * HOUR;
const int MONTH = 30 * DAY;

var ts = DateTime.Now.Subtract(value);
double seconds = ts.TotalSeconds;

// Less than one minute
if (seconds < 1 * MINUTE) return ts.Seconds == 1 ? "one second ago" : ts.Seconds + " seconds ago"; if (seconds < 60 * MINUTE) return ts.Minutes + " minutes ago"; if (seconds < 120 * MINUTE) return "an hour ago"; if (seconds < 24 * HOUR) return ts.Hours + " hours ago"; if (seconds < 48 * HOUR) return "yesterday"; if (seconds < 30 * DAY) return ts.Days + " days ago"; if (seconds < 12 * MONTH) { int months = System.Convert.ToInt32(Math.Floor((double)ts.Days / 30)); return months <= 1 ? "one month ago" : months + " months ago"; } int years = System.Convert.ToInt32(Math.Floor((double)ts.Days / 365)); return years <= 1 ? "one year ago" : years + " years ago"; } } } [/csharp]

   
 


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;


    public static class DateTimeExt
    {
        public static bool Ext_IsWeekend(this DateTime value)
        {
            return (value.DayOfWeek == DayOfWeek.Sunday || value.DayOfWeek == DayOfWeek.Saturday);
        }

    }

   
     

   
 
using System;
using System.Collections.Generic;
using System.Text;


    public static class TimingUtilities
    {
        private static long ticks;
        public static void startTimer()
        {
            ticks = DateTime.Now.Ticks;
        }
        public static double GetElapsedTime()
        {
            return (DateTime.Now.Ticks - ticks) / Math.Pow(10, 4);
        }
    }

   
     

   
 
#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Text;
using System.Data.SqlTypes;

namespace Newtonsoft.Utilities.Time
{
  public static class DateTimeUtils
  {
    public static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0);

    public static DateTime ToSqlServerPrecision(DateTime value)
    {
      SqlDateTime sqlValue = new SqlDateTime(value);

      return sqlValue.Value;
    }

    public static DateTime ConvertUnixSeconds(long unixSeconds, long residualNanoseconds)
    {
      DateTime actualDateTime = ConvertUnixSeconds(unixSeconds);

      long ticks = residualNanoseconds / 100;

      return actualDateTime.AddTicks(ticks);
    }

    public static DateTime ConvertUnixSeconds(long unixSeconds)
    {
      return UnixEpoch.AddSeconds(unixSeconds);
    }

    public static string ToFileSortableDateTime(DateTime value)
    {
      return value.ToString("yyyyMMdd'T'HHmmss", CultureInfo.CurrentCulture);
    }

    public static DateTime FromFileSortableDateTime(string value)
    {
      return DateTime.ParseExact(value, "yyyyMMdd'T'HHmmss", CultureInfo.CurrentCulture);
    }
  }
}

   
     

   
 


//http://www.bouncycastle.org/
//MIT X11 License

using System;

namespace Org.BouncyCastle.Utilities.Date
{
  public class DateTimeUtilities
  {
    public static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1);

    private DateTimeUtilities()
    {
    }

    /// <summary>
    /// Return the number of milliseconds since the Unix epoch (1 Jan., 1970 UTC) for a given DateTime value.
    /// </summary>
    /// <param name="dateTime">A UTC DateTime value not before epoch.</param>
    /// <returns>Number of whole milliseconds after epoch.</returns>
    /// <exception cref="ArgumentException">&#039;dateTime&#039; is before epoch.</exception>
    public static long DateTimeToUnixMs(DateTime dateTime)
    {
      if (dateTime.CompareTo(UnixEpoch) < 0)
        throw new ArgumentException("DateTime value may not be before the epoch", "dateTime");

      return (dateTime.Ticks - UnixEpoch.Ticks) / TimeSpan.TicksPerMillisecond;
    }

    /// <summary>
    /// Create a DateTime value from the number of milliseconds since the Unix epoch (1 Jan., 1970 UTC).
    /// </summary>
    /// <param name="unixMs">Number of milliseconds since the epoch.</param>
    /// <returns>A UTC DateTime value</returns>
    public static DateTime UnixMsToDateTime(long unixMs)
    {
      return new DateTime(unixMs * TimeSpan.TicksPerMillisecond + UnixEpoch.Ticks);
    }

    /// <summary>
    /// Return the current number of milliseconds since the Unix epoch (1 Jan., 1970 UTC).
    /// </summary>
    public static long CurrentUnixMs()
    {
      return DateTimeToUnixMs(DateTime.UtcNow);
    }
  }
}