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C# ASP.NET String.Format DateTime Source Code Example

Description: Illustrates using String Format DateTime in C-Sharp ASP.NET.

Example Webform Code:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="StringFormatDateTime.aspx.cs" Inherits="LanguageBasics_StringFormatDateTime" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
    </div>
    </form>
</body>
</html>

Example Code Behind:

using System;
using System.Text;
partial class LanguageBasics_StringFormatDateTime : System.Web.UI.Page
{
 
 
 
    protected void  Page_Load(object sender, System.EventArgs e)
    {
 
        //**************************************************
        //        Custom DateTime Formatting
        //**************************************************
        StringBuilder sb = new StringBuilder();
        sb.Append("Custom DateTime Formatting:<br />");
 
        //Here are custom format specifiers y (year), M (month), d (day), h (hour 12), H (hour 24), m (minute), s (second),
        // f (second fraction), F (second fraction, trailing zeroes are trimmed), t (P.M or A.M) and z (time zone).
 
        //Following examples show how the format specifiers can be used.
        // create date time 2009-12-21 20:04:08.101
        DateTime dt = new DateTime(2009, 12, 20, 20, 4, 8, 101);
 
        // Ways to format year: "9 09 009 2009"   year
        sb.Append(string.Format("{0:y yy yyy yyyy}", dt) + "<br />");
 
        // Ways to format month: "12 12 Dec December"  month
        sb.Append(string.Format("{0:M MM MMM MMMM}", dt) + "<br />");
 
        // Ways to format day: "21 21 Sun Sunday" day
        sb.Append(string.Format("{0:d dd ddd dddd}", dt) + "<br />");
 
        // Ways to format hour: "8 08 20 20"      hour 12/24
        sb.Append(string.Format("{0:h hh H HH}", dt) + "<br />");
 
        // Ways to format minute: "4 04"            minute
        sb.Append(string.Format("{0:m mm}", dt) + "<br />");
 
        // Ways to format second:  ' "8 08"            second 
        sb.Append(string.Format("{0:s ss}", dt) + "<br />");
 
        // Ways to format fraction of second: "1 10 101 1010"   sec.fraction
        sb.Append(string.Format("{0:f ff fff ffff}", dt) + "<br />");
 
        // Ways to format fraction of second: "1 1 101 101"   without zeros
        sb.Append(string.Format("{0:F FF FFF FFFF}", dt) + "<br />");
 
        // How to display am or pm: "P PM"            A.M. or P.M.
        sb.Append(string.Format("{0:t tt}", dt) + "<br />");
 
        // How to display timezone: "-6 -06 -06:00"   time zone
        sb.Append(string.Format("{0:z zz zzz}", dt) + "<br />");
 
 
        //**************************************************
        //        Using date separator / (slash) and time sepatator : (colon).
        //**************************************************
        sb.Append("<br />");
        sb.Append("Using date separator / (slash) and time sepatator : (colon):<br />");
 
        //These characters will be rewritten to characters defined 
        //in the current DateTimeFormatInfo.DateSeparator and DateTimeFormatInfo.TimeSeparator.
 
 
        // "20/12/09 20:04:08" - english (en-US)
        sb.Append(string.Format("{0:d/M/yyyy HH:mm:ss}", dt) + "<br />");
 
        // "20.12.2009 20:04:08" - german (de-DE)
        // date separator in german culture is "." (so "/" changes to ".")
        sb.Append(string.Format("{0:d/M/yyyy HH:mm:ss}", dt) + "<br />");
 
        //**************************************************
        // Here are some examples of custom date and time formatting:
        //**************************************************
        sb.Append("<br />");
        sb.Append("Here are some examples of custom date and time formatting:<br />");
 
        // month/day numbers without/with leading zeroes
        // "12/20/2009"
        sb.Append(string.Format("{0:M/d/yyyy}", dt) + "<br />");
 
        // "12/20/2009"
        sb.Append(string.Format("{0:MM/dd/yyyy}", dt) + "<br />");
 
        // day/month names
        // "Sun, Dec 20, 2009"
        sb.Append(string.Format("{0:ddd, MMM d, yyyy}", dt) + "<br />");
 
        // "Sunday, December 20, 2009"
        // two/four digit year
        sb.Append(string.Format("{0:dddd, MMMM d, yyyy}", dt) + "<br />");
 
        // "12/20/09"
        sb.Append(string.Format("{0:MM/dd/yy}", dt) + "<br />");
 
        // "12/20/2009"
        sb.Append(string.Format("{0:MM/dd/yyyy}", dt) + "<br />");
 
        //**************************************************
        //        Standard DateTime Formatting
        //**************************************************
        sb.Append("<br />");
        sb.Append("Standard DateTime Formatting:<br />");
        //In DateTimeFormatInfo there are defined standard patterns for the current culture. 
        //For example, property ShortTimePattern is string that contains value h:mm tt for en-US culture 
        //and value HH:mm for de-DE culture.
 
        //Following table shows patterns defined in DateTimeFormatInfo and their values for en-US culture. 
        //First column contains format specifiers for the String.Format method.
 
        //Specifier DateTimeFormatInfo property Pattern value (for en-US culture) 
        //t ShortTimePattern h:mm tt 
        //d ShortDatePattern M/d/yyyy 
        //T LongTimePattern h:mm:ss tt 
        //D LongDatePattern dddd, MMMM dd, yyyy 
        //f (combination of D and t) dddd, MMMM dd, yyyy h:mm tt 
        //F FullDateTimePattern dddd, MMMM dd, yyyy h:mm:ss tt 
        //g (combination of d and t) M/d/yyyy h:mm tt 
        //G (combination of d and T) M/d/yyyy h:mm:ss tt 
        //m, M MonthDayPattern MMMM dd 
        //y, Y YearMonthPattern MMMM, yyyy 
        //r, R RFC1123Pattern ddd, dd MMM yyyy HH':'mm':'ss 'GMT' (*) 
        //s SortableDateTimePattern yyyy'-'MM'-'dd'T'HH':'mm':'ss (*) 
        //u UniversalSortableDateTimePattern yyyy'-'MM'-'dd HH':'mm':'ss'Z' (*) 
        //    (*) = culture independent 
 
        //Following examples show usage of standard format specifiers in String.Format method and the resulting output.
 
        // "8:04 PM"                         ShortTime
        sb.Append(string.Format("{0:t}", dt) + "<br />");
 
        // "12/20/2009"                        ShortDate
        sb.Append(string.Format("{0:d}", dt) + "<br />");
 
        // "8:04:08 PM"                      LongTime
        sb.Append(string.Format("{0:T}", dt) + "<br />");
 
        // "Sunday, December 20, 2009"          LongDate
        sb.Append(string.Format("{0:D}", dt) + "<br />");
 
        // "Sunday, December 20, 2009 8:04 PM"  LongDate+ShortTime
        sb.Append(string.Format("{0:f}", dt) + "<br />");
 
        // "Sunday, December 20, 2009 8:04:08 PM" FullDateTime
        sb.Append(string.Format("{0:F}", dt) + "<br />");
 
        // "12/20/2009 8:04 PM"                ShortDate+ShortTime
        sb.Append(string.Format("{0:g}", dt) + "<br />");
 
        // "12/20/2009 8:04:08 PM"             ShortDate+LongTime
        sb.Append(string.Format("{0:G}", dt) + "<br />");
 
        // "December 20"                        MonthDay
        sb.Append(string.Format("{0:m}", dt) + "<br />");
 
        // "December, 2009"                     YearMonth
        sb.Append(string.Format("{0:y}", dt) + "<br />");
 
        // "Sun, 20 Dec 2009 20:04:08 GMT"   
        sb.Append(string.Format("{0:r}", dt) + "<br />");
 
        // "2009-12-20T20:04:08"             SortableDateTime
        sb.Append(string.Format("{0:s}", dt) + "<br />");
 
        // "2009-12-20 20:04:08Z"            UniversalSortableDateTime
        sb.Append(string.Format("{0:u}", dt) + "<br />");
 
        Label1.Text = sb.ToString();
 
 
 
 
 
    }
}

Example Connection String:

<connectionStrings>
    <add name="Northwind_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" />
    <add name="Pubs_ConnectionString"
      connectionString="Server=(local)\SQLEXPRESS;Initial Catalog=pubs;Integrated Security=SSPI" />
  </connectionStrings>