Le Tutoriel de C# Date Time

public DateTime(int year, int month, int day)

public DateTime(int year, int month, int day, Calendar calendar)

public DateTime(int year, int month, int day, int hour, int minute, int second)

public DateTime(int year, int month, int day, int hour, int minute, int second, Calendar calendar)

public DateTime(int year, int month, int day, int hour, int minute, int second, DateTimeKind kind)

public DateTime(int year, int month, int day, int hour, int minute, int second, int millisecond)

public DateTime(int year, int month, int day, int hour,
                    int minute, int second, int millisecond, Calendar calendar)

public DateTime(int year, int month, int day, int hour,
                   int minute, int second, int millisecond, Calendar calendar, DateTimeKind kind)

public DateTime(int year, int month, int day, int hour,
                    int minute, int second, int millisecond, DateTimeKind kind)

public DateTime(long ticks)

public DateTime(long ticks, DateTimeKind kind)

// L'objet décrit l'heure actuelle.
DateTime now = DateTime.Now;

Console.WriteLine("Now is "+ now);

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

namespace DateTimeTutorial
{
    class DateTimePropertiesExample
    { 
        public static void Main(string[] args)
        {
            // Créez un objet DateTime (année, mois, jour, heure, minutes, secondes).
            DateTime aDateTime = new DateTime(2005, 11, 20, 12, 1, 10); 

            // Imprimez des informations:
            Console.WriteLine("Day:{0}", aDateTime.Day);
            Console.WriteLine("Month:{0}", aDateTime.Month);
            Console.WriteLine("Year:{0}", aDateTime.Year);
            Console.WriteLine("Hour:{0}", aDateTime.Hour);
            Console.WriteLine("Minute:{0}", aDateTime.Minute);
            Console.WriteLine("Second:{0}", aDateTime.Second);
            Console.WriteLine("Millisecond:{0}", aDateTime.Millisecond);

            // Enum {Monday, Tuesday,... Sunday}
            DayOfWeek dayOfWeek = aDateTime.DayOfWeek;    
            Console.WriteLine("Day of Week:{0}", dayOfWeek );  
            Console.WriteLine("Day of Year: {0}", aDateTime.DayOfYear);

            // Un objet décrit seulement l'heure (heure minute, ...)
            // ​​​​​​​
            TimeSpan timeOfDay = aDateTime.TimeOfDay;  
            Console.WriteLine("Time of Day:{0}", timeOfDay);

            // Convertissez en tiques (1 seconde = 10 000 000 tiques)
            Console.WriteLine("Tick:{0}", aDateTime.Ticks);

            // {Local, Itc, Unspecified}
            DateTimeKind kind = aDateTime.Kind;  
            Console.WriteLine("Kind:{0}", kind); 
            Console.Read();
        }
    } 
}

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

namespace DateTimeTutorial
{
    class AddSubtractExample
    { 
        public static void Main(string[] args)
        {
            // Current Time
            DateTime aDateTime = DateTime.Now; 
            Console.WriteLine("Now is " + aDateTime);

            // An Interval.
            // 1 hour + 1 minute
            TimeSpan aInterval = new System.TimeSpan(0, 1, 1, 0);

            // Add an interval.
            DateTime newTime = aDateTime.Add(aInterval);  
            Console.WriteLine("After add 1 hour, 1 minute: " + newTime);

            // Subtract an interval.
            newTime = aDateTime.Subtract(aInterval); 
            Console.WriteLine("After subtract 1 hour, 1 minute: " + newTime); 
            Console.Read();
        }
    } 
}

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

namespace DateTimeTutorial
{
    class AddSubtractExample2
    {
        public static void Main(string[] args)
        {
            // L'heure actuelle.
            DateTime aDateTime = DateTime.Now; 
            Console.WriteLine("Now is " + aDateTime);           

            // Ajoutez un an.
            DateTime newTime = aDateTime.AddYears(1);  
            Console.WriteLine("After add 1 year: " + newTime);

            // ​​​​​​​
            // Supprimez une heure
            // ​​​​​​​
            newTime = aDateTime.AddHours(-1); 
            Console.WriteLine("After add -1 hour: " + newTime); 
            Console.Read();
        }
    } 
}

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

namespace DateTimeTutorial
{
    class FirstLastDayDemo
    {
        public static void Main(string[] args)
        { 
            Console.WriteLine("Today is " + DateTime.Today); 
            DateTime yesterday = GetYesterday(); 
            Console.WriteLine("Yesterday is " + yesterday); 
            // Le premier jour de février 2015
            DateTime aDateTime = GetFistDayInMonth(2015, 2); 
            Console.WriteLine("First day of 2-2015: " + aDateTime); 
            // Le dernier jour de février 2015
            aDateTime = GetLastDayInMonth(2015, 2); 
            Console.WriteLine("Last day of 2-2015: " + aDateTime); 
            // Le premier jour de 2015
            aDateTime = GetFirstDayInYear(2015); 
            Console.WriteLine("First day year 2015: " + aDateTime); 
            // Le dernier jour de 2015
            aDateTime = GetLastDayInYear(2015); 
            Console.WriteLine("Last day year 2015: " + aDateTime); 
            Console.Read();
        } 
        // Retournez Hier.
        public static DateTime GetYesterday()
        {
            // Aujourd'hui.
            DateTime today = DateTime.Today;

            // Supprimez un jour.
            return today.AddDays(-1);
        } 
        // Renvoiez le premier jour de l'année
        public static DateTime GetFirstDayInYear(int year)
        {
            DateTime aDateTime = new DateTime(year, 1, 1);
            return aDateTime;
        } 
        // Renvoiez le dernier jour de l'année
        public static DateTime GetLastDayInYear(int year)
        {
            DateTime aDateTime = new DateTime(year +1, 1, 1); 
            // Supprimez un jour.
            DateTime retDateTime = aDateTime.AddDays(-1);

            return retDateTime;
        } 
        // Retournez le premier jour du mois.
        public static DateTime GetFistDayInMonth(int year, int month)
        {
            DateTime aDateTime = new DateTime(year, month, 1); 
            return aDateTime;
        } 
        // Retournez le dernier jour du mois.
        public static DateTime GetLastDayInMonth(int year, int month)
        {
            DateTime aDateTime = new DateTime(year, month, 1);

            // Ajoutez un mois et supprimez un jour.​​​​​​​
            DateTime retDateTime = aDateTime.AddMonths(1).AddDays(-1); 
            return retDateTime;
        } 
    } 
}

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

namespace DateTimeTutorial
{
    class IntervalDemo
    {
        public static void Main(string[] args)
        {
            // L'heure actuelle.
            DateTime aDateTime = DateTime.Now;

            // Le temps en 2000
            DateTime y2K = new DateTime(2000,1,1);

            // L'intervalle de 2000 jusqu'au aujourd'hui
            TimeSpan interval = aDateTime.Subtract(y2K); 

            Console.WriteLine("Interval from Y2K to Now: " + interval);

            Console.WriteLine("Days: " + interval.Days);
            Console.WriteLine("Hours: " + interval.Hours);
            Console.WriteLine("Minutes: " + interval.Minutes);
            Console.WriteLine("Seconds: " + interval.Seconds); 
            Console.Read();
        }
    } 
}

// Si la valeur <0 signifie firstDateTime plus tôt (précédente)
// Si la valeur> 0 signifie secondDateTime plus tôt (ultérieure).
// Si la valeur = 0 signifie que les deux objets sont les mêmes en termes de temps.
public static int Compare(DateTime firstDateTime, DateTime secondDateTime);

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

namespace DateTimeTutorial
{
    class CompareDateTimeExample
    {
        public static void Main(string[] args)
        {
            // L'heure actuelle.
            DateTime firstDateTime = new DateTime(2000, 9, 2); 
            DateTime secondDateTime = new DateTime(2011, 1, 20); 
            int compare = DateTime.Compare(firstDateTime, secondDateTime);

            Console.WriteLine("First DateTime: " + firstDateTime);
            Console.WriteLine("Second DateTime: " + secondDateTime);

            Console.WriteLine("Compare value: " + compare);// -1

            if (compare < 0)
            {
                // firstDateTime plus tôt que secondDateTime.
                Console.WriteLine("firstDateTime is earlier than secondDateTime");
            }
            else
            {
                // firstDateTime plus tard que secondDateTime
                Console.WriteLine("firstDateTime is laster than secondDateTime");
            } 
            Console.Read();
        }
    } 
}

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

namespace DateTimeTutorial
{
    class AllStandardFormatsDemo
    {
        public static void Main(string[] args)
        { 
            DateTime aDateTime = new DateTime(2015, 12, 20, 11, 30, 50); 
            // Les formats date-heure sont pris en charge.
            string[] formattedStrings = aDateTime.GetDateTimeFormats();

            foreach (string format in formattedStrings)
            {
                Console.WriteLine(format);
            }  
            Console.Read();
        }
    } 
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;

namespace DateTimeTutorial
{
    class SimpleDateTimeFormat
    {
        public static void Main(string[] args)
        {

            DateTime aDateTime = new DateTime(2015, 12, 20, 11, 30, 50);

            Console.WriteLine("DateTime: " + aDateTime);

            String d_formatString = aDateTime.ToString("d");

            Console.WriteLine("Format 'd' : " + d_formatString);

            // Un objet décrit la culture américaine (en-US Culture)
            CultureInfo enUs = new CultureInfo("en-US"); 

            // ==> 12/20/2015 (MM/dd/yyyy)
            Console.WriteLine("Format 'd' & en-US: " + aDateTime.ToString("d", enUs));

            // La culture vietnamienne.
            CultureInfo viVn = new CultureInfo("vi-VN");

            // ==> 12/20/2015 (dd/MM/yyyy)
            Console.WriteLine("Format 'd' & vi-VN: " + aDateTime.ToString("d", viVn));


            Console.Read();
        }
    }

}

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

namespace DateTimeTutorial
{
    class SimpleDateTimeFormatAll
    {
        public static void Main(string[] args)
        {
            char[] formats = {'d', 'D','f','F','g','G','M', 'm','O', 'o','R', 'r','s','t','T','u','U','Y', 'y'};  
            DateTime aDateTime = new DateTime(2015, 12, 20, 11, 30, 50); 
            foreach (char ch in formats)
            {
                Console.WriteLine("\n======" + ch + " ========\n"); 
                // Les formats date-heure sont soutenus.​
                string[] formattedStrings = aDateTime.GetDateTimeFormats(ch);

                foreach (string format in formattedStrings)
                {
                    Console.WriteLine(format);
                }
            } 
            Console.ReadLine();
        }
    } 
}

// Les séries chronologiques que vous voyez sur Http Header
string httpTime = "Fri, 21 Feb 2011 03:11:31 GMT";

// Les séries chronologiques que vous voyez sur w3.org
string w3Time = "2016/05/26 14:37:11";

// Les séries chronologiques que vous voyez sur nytimes.com
string nyTime = "Thursday, February 26, 2012";

// Les séries chronologiques standard ISO 8601.
string isoTime = "2016-02-10";

// Les séries chronologiques de la date et l'heure lors les manipulation de création / de modification un fichier sous Windows.
// ​​​​​​​
string windowsTime = "11/21/2015 11:35 PM";

// Les séries chronologiques sur "Windows Date and Time panel"
string windowsPanelTime = "11:07:03 PM";

string format = "dd/MM/yyyy HH:mm:ss";

DateTime now = DateTime.Now;

// ==> 18/03/2016 23:49:39
string s = now.ToString(format);

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

namespace DateTimeTutorial
{
    class CustomDateTimeFormatExample
    {

        public static void Main(string[] args)
        {
            // Un format de date et d'heure.
            string format = "dd/MM/yyyy HH:mm:ss";

            DateTime now = DateTime.Now;

            string s = now.ToString(format);

            Console.WriteLine("Now: " + s);

            Console.Read();

        }

    }

}

public static DateTime Parse(string s)

public static DateTime Parse(string s, IFormatProvider provider)

public static DateTime Parse(string s, IFormatProvider provider, DateTimeStyles styles)


public static bool TryParseExact(string s, string format,
           IFormatProvider provider, DateTimeStyles style,
           out DateTime result)

public static bool TryParseExact(string s, string[] formats,
           IFormatProvider provider, DateTimeStyles style,
           out DateTime result)

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

namespace DateTimeTutorial
{
    class ParseDateStringExample
    {

        public static void Main(string[] args)
        {

            string dateString = "20160319 09:57";

            // Utilisez ParseExact pour analyser une chaîne en DateTime.
            DateTime dateTime = DateTime.ParseExact(dateString, "yyyyMMdd HH:mm", null);

            Console.WriteLine("Input dateString: " + dateString);

            Console.WriteLine("Parse Results: " + dateTime.ToString("dd-MM-yyyy HH:mm:ss"));

            // Une chaîne Datetime a un espace blanc en avant.
            dateString = "  20110319 11:57";

            // Utilisez la méthode TryParseExact.
            // Cette méthode renvoie true si la chaîne 'dateString' peut être analysée.
            // Et renvoie la valeur de paramètre 'out dateTime'.
            bool successful = DateTime.TryParseExact(dateString, "yyyyMMdd HH:mm", null,
                     System.Globalization.DateTimeStyles.AllowLeadingWhite,
                     out dateTime);

            Console.WriteLine("\n------------------------\n");

            Console.WriteLine("Input dateString: " + dateString);

            Console.WriteLine("Can Parse? :" + successful);

            if (successful)
            {
                Console.WriteLine("Parse Results: " + dateTime.ToString("dd-MM-yyyy HH:mm:ss"));
            }


            Console.Read();
        }
    }

}