Csharp/C Sharp/Development Class/Date Time Format

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Compare the results of choosing InvariantInfo with those of choosing CurrentInfo:

<source lang="csharp">

using System; using System.Globalization; public class MainClass { 

   public static void Main() {
       DateTime dt = new DateTime();
       DateTimeFormatInfo dtfi;
       Console.Write("[I]nvariant or [C]urrent Info?: ");
       if (Console.Read() == "I")
           dtfi = DateTimeFormatInfo.InvariantInfo;
       else
           dtfi = DateTimeFormatInfo.CurrentInfo;
       dtfi = DateTimeFormatInfo.InvariantInfo;
       Console.WriteLine(dt.ToString("D", dtfi));
       Console.WriteLine(dt.ToString("f", dtfi));
       Console.WriteLine(dt.ToString("F", dtfi));
       Console.WriteLine(dt.ToString("g", dtfi));
       Console.WriteLine(dt.ToString("G", dtfi));
       Console.WriteLine(dt.ToString("m", dtfi));
       Console.WriteLine(dt.ToString("r", dtfi));
       Console.WriteLine(dt.ToString("s", dtfi));
       Console.WriteLine(dt.ToString("t", dtfi));
       Console.WriteLine(dt.ToString("T", dtfi));
       Console.WriteLine(dt.ToString("u", dtfi));
       Console.WriteLine(dt.ToString("U", dtfi));
       Console.WriteLine(dt.ToString("d", dtfi));
       Console.WriteLine(dt.ToString("y", dtfi));
       Console.WriteLine(dt.ToString("dd-MMM-yy", dtfi));
   }

} 

</source>


DateTime ToString with CultureInfo

<source lang="csharp"> using System; using System.Globalization; using System.Threading; class Program { 

   static void Main(string[] args) {
       DateTime d = new DateTime(2005, 08, 09);
       Console.WriteLine(d.ToLongDateString());
       Console.WriteLine(d.ToString("D", new CultureInfo("fr-FR")));
       CultureInfo ci = Thread.CurrentThread.CurrentCulture;
       Console.WriteLine(ci.ToString() + ": " + d.ToString("D"));
       ci = new CultureInfo("es-ES");
       Thread.CurrentThread.CurrentCulture = ci;
       Console.WriteLine(ci.ToString() + ": " + d.ToString("D"));
   }

} 

</source>


demonstrates culture formatting

<source lang="csharp"> /* Mastering Visual C# .NET by Jason Price, Mike Gunderloy Publisher: Sybex; ISBN: 0782129110

  • /

/* 

 Example21_10.cs demonstrates culture formatting
  • /

using System; using System.Globalization; public class Example21_10 { 

 public static void Main() 
 {
   // create a date and a currency value
   DateTime dtNow = DateTime.Now;
   Double curOriginal = 12345.67;
   // and format the variables for a specific culture
   CultureInfo ci = new CultureInfo("en-US");
   string sLocalizedDate = dtNow.ToString("d", ci);
   string sLocalizedCur = curOriginal.ToString("c", ci);
   // print them out
   Console.WriteLine(sLocalizedDate);
   Console.WriteLine(sLocalizedCur);
   // and format them for a second culture
   CultureInfo ci2 = new CultureInfo("en-GB");
   string sLocalizedDate2 = dtNow.ToString("d", ci2);
   string sLocalizedCur2 = curOriginal.ToString("c", ci2);
   // print them out again
   Console.WriteLine(sLocalizedDate2);
   Console.WriteLine(sLocalizedCur2);
 }

} 


      </source>


Format time and date information 1

<source lang="csharp"> /* C#: The Complete Reference by Herbert Schildt Publisher: Osborne/McGraw-Hill (March 8, 2002) ISBN: 0072134852

  • /

// Format time and date information.

using System;

public class CustomTimeAndDateFormatsDemo { 

 public static void Main() {  
   DateTime dt = DateTime.Now; 

   Console.WriteLine("Time is {0:hh:mm tt}", dt); 
   Console.WriteLine("24 hour time is {0:hh:mm}", dt); 
   Console.WriteLine("Date is {0:ddd MMM dd, yyyy}", dt); 

   Console.WriteLine("Era: {0:gg}", dt); 

   Console.WriteLine("Time with seconds: " + 
                     "{0:HH:mm:ss tt}", dt); 

   Console.WriteLine("Use m for day of month: {0:m}", dt); 
   Console.WriteLine("use m for minutes: {0:%m}", dt); 
 }

} 

      </source>


Format time and date information 2

<source lang="csharp"> /* C#: The Complete Reference by Herbert Schildt Publisher: Osborne/McGraw-Hill (March 8, 2002) ISBN: 0072134852

  • /

// Format time and date information.

using System;

public class TimeAndDateFormatDemo { 

 public static void Main() {  
   DateTime dt = DateTime.Now; // obtain current time 

   Console.WriteLine("d format: {0:d}", dt); 
   Console.WriteLine("D format: {0:D}", dt); 

   Console.WriteLine("t format: {0:t}", dt); 
   Console.WriteLine("T format: {0:T}", dt); 

   Console.WriteLine("f format: {0:f}", dt); 
   Console.WriteLine("F format: {0:F}", dt); 

   Console.WriteLine("g format: {0:g}", dt); 
   Console.WriteLine("G format: {0:G}", dt); 

   Console.WriteLine("m format: {0:m}", dt); 
   Console.WriteLine("M format: {0:M}", dt); 

   Console.WriteLine("r format: {0:r}", dt); 
   Console.WriteLine("R format: {0:R}", dt); 

   Console.WriteLine("s format: {0:s}", dt); 

   Console.WriteLine("u format: {0:u}", dt); 
   Console.WriteLine("U format: {0:U}", dt); 

   Console.WriteLine("y format: {0:y}", dt); 
   Console.WriteLine("Y format: {0:Y}", dt); 
 }

} 

      </source>


Request a specific culture (english language in Great Britain):

<source lang="csharp"> using System; using System.Globalization; public class MainClass { 

   public static void Main() {
       CultureInfo uk = CultureInfo.GetCultureInfo("en-GB");
       Console.WriteLine(3.ToString("C", uk));      // ?¡ê3.00
   }

} 

</source>


The next example formats a DateTime with invariant culture. Invariant culture is always the same, regardless of the computer"s settings:

<source lang="csharp"> using System; using System.Globalization; public class MainClass { 

   public static void Main() {
       DateTime dt = new DateTime(2000, 1, 2);
       CultureInfo iv = CultureInfo.InvariantCulture;
       Console.WriteLine(dt.ToString(iv));            // 01/02/2000 00:00:00
       Console.WriteLine(dt.ToString("d", iv));       // 01/02/2000
   }

} 

</source>


use the FromFileTime() method to convert an operating system file timestamp to a DateTime

<source lang="csharp">

using System; class MainClass { 

   public static void Main() {
       DateTime myDateTime10 = new DateTime(2004, 1, 15, 23, 2, 5);
       long myFileTime = myDateTime10.ToFileTime();        
       DateTime myDateTime11 = DateTime.FromFileTime(myFileTime);
       Console.WriteLine("DateTime.FromFileTime() = " + myDateTime11);
   }

} 

</source>


use the ToFileTime() method to convert a DateTime to an operating system file timestamp

<source lang="csharp"> using System; class MainClass { 

   public static void Main() {
       DateTime myDateTime10 = new DateTime(2004, 1, 15, 23, 2, 5);
       long myFileTime = myDateTime10.ToFileTime();
       Console.WriteLine("myDateTime10.ToFileTime() = " + myDateTime10.ToFileTime());
   }

} 

</source>


use the ToLongTimeString() and ToShortTimeString() methods to convert the time parts of a DateTime to long and short time strings

<source lang="csharp">

using System; class MainClass { 

   public static void Main() {
       DateTime myDateTime10 = new DateTime(2004, 1, 15, 23, 2, 5);
       long myFileTime = myDateTime10.ToFileTime();        
       DateTime myDateTime11 = DateTime.FromFileTime(myFileTime);
       Console.WriteLine("myDateTime11.ToLongTimeString() = " + myDateTime11.ToLongTimeString());
       Console.WriteLine("myDateTime11.ToShortTimeString() = " + myDateTime11.ToShortTimeString());
   }

} 

</source>


use the ToString() method to convert a DateTime to a string

<source lang="csharp">

using System; class MainClass { 

   public static void Main() {
       DateTime myDateTime12 = new DateTime(2004, 1, 12, 22, 2, 10);
       Console.WriteLine("myDateTime12.ToString() = " + myDateTime12.ToString());
       Console.WriteLine("myDateTime12.ToString(\"MMMM dd, yyyy\") = " +myDateTime12.ToString("MMMM dd, yyyy"));
       Console.WriteLine("myDateTime12.ToString(\"d\") = " + myDateTime12.ToString("d"));
       Console.WriteLine("myDateTime12.ToString(\"D\") = " + myDateTime12.ToString("D"));
       Console.WriteLine("myDateTime12.ToString(\"f\") = " + myDateTime12.ToString("f"));
       Console.WriteLine("myDateTime12.ToString(\"F\") = " + myDateTime12.ToString("F"));
       Console.WriteLine("myDateTime12.ToString(\"g\") = " + myDateTime12.ToString("g"));
       Console.WriteLine("myDateTime12.ToString(\"G\") = " + myDateTime12.ToString("G"));
       Console.WriteLine("myDateTime12.ToString(\"m\") = " + myDateTime12.ToString("m"));
       Console.WriteLine("myDateTime12.ToString(\"r\") = " + myDateTime12.ToString("r"));
       Console.WriteLine("myDateTime12.ToString(\"s\") = " + myDateTime12.ToString("s"));
       Console.WriteLine("myDateTime12.ToString(\"t\") = " + myDateTime12.ToString("t"));
       Console.WriteLine("myDateTime12.ToString(\"T\") = " + myDateTime12.ToString("T"));
       Console.WriteLine("myDateTime12.ToString(\"u\") = " + myDateTime12.ToString("u"));
       Console.WriteLine("myDateTime12.ToString(\"U\") = " + myDateTime12.ToString("U"));
       Console.WriteLine("myDateTime12.ToString(\"y\") = " + myDateTime12.ToString("y"));
   }

} 

</source>
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