Date and Time formats in asp.net using C-Sharp, vb.net

Hello friends, In this article we are going to learn, How we can use different type of Date and Time formats in asp.net with C# and Vb.net. Moreover to convert Date Time formats.

In each and every web and mobile application we frequently use Date Time Objects. There are so many different DateTime formats available, which can be used as per application requirement. Some of them are custom date and time formats. This article will help developers to choose right date time formats for their applications and convert date time from one format to another format as follows.

We can use DateTime Object or we can create our own DateTimeobject from DateTime string too as follows.

DateTime dt = DateTime.Now;
Response.Write(dt.ToString());

Output: 9/22/2019 3:31:55 AM

string dts = "10/25/2019";
dt = DateTime.ParseExact(dts, "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture);
Response.Write(dt.ToString());

Output: 10/25/2019 12:00:00 AM

Create Web Application with dot net framework.

Add a command button on web form.

Add following code on command button event as follows.

Asp.net C# Code

using System;
using System.Web.UI;

namespace DateTimeFormatApp
{
    public partial class _Default : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnShowDatFormats_Click(object sender, EventArgs e)
        {
            //Create Current DateTime Object
            DateTime dt = DateTime.Now;
            Response.Write("System Default Format "+dt.ToString()+"<br />");

            string dts = "10/25/2019";
            dt = DateTime.ParseExact(dts, "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture);
            Response.Write("System Default Format "+dt.ToString() + "<br />");
            

            Response.Write("<br /> dd-MM-yyyy " + DateTime.Today.ToString("dd-MM-yyyy"));  
            Response.Write("<br /> dd/MM/yyyy " + DateTime.Today.ToString("dd/MM/yyyy"));  
            Response.Write("<br /> dd MM yyyy " + DateTime.Today.ToString("dd MM yyyy"));  
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> dd-MM-yy " + DateTime.Today.ToString("dd-MM-yy"));  
            Response.Write("<br /> dd/MM/yy " + DateTime.Today.ToString("dd/MM/yy"));  
            Response.Write("<br /> dd MM yy " + DateTime.Today.ToString("dd MM yy"));   
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> ddd-dd-MM-yy " + DateTime.Today.ToString("ddd-dd-MM-yy")); 
            Response.Write("<br /> ddd/dd/MM/yy " + DateTime.Today.ToString("ddd/dd/MM/yy")); 
            Response.Write("<br /> ddd dd MM yy " + DateTime.Today.ToString("ddd dd MM yy"));  
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> dddd-dd-MM-yy " + DateTime.Today.ToString("dddd-dd-MM-yy"));  
            Response.Write("<br /> dddd/dd/MM/yy " + DateTime.Today.ToString("dddd/dd/MM/yy"));  
            Response.Write("<br /> dddd dd MM yy " + DateTime.Today.ToString("dddd dd MM yy"));    
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> dd-MMM-yyyy " + DateTime.Today.ToString("dd-MMM-yyyy"));    


            Response.Write("<br /> dd/MMM/yyyy " + DateTime.Today.ToString("dd/MMM/yyyy"));  
            Response.Write("<br /> dd MMM yyyy " + DateTime.Today.ToString("dd MMM yyyy")); 
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> dd-MMMM-yyyy " + DateTime.Today.ToString("dd-MMMM-yyyy"));  
            Response.Write("<br /> dd/MMMM/yyyy " + DateTime.Today.ToString("dd/MMMM/yyyy"));  
            Response.Write("<br /> dd MMMM yyyy " + DateTime.Today.ToString("dd MMMM yyyy"));
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> MM-dd-yyyy " + DateTime.Today.ToString("MM-dd-yyyy")); 
            Response.Write("<br /> MM/dd/yyyy " + DateTime.Today.ToString("MM/dd/yyyy")); 
            Response.Write("<br /> MM dd yyyy " + DateTime.Today.ToString("MM dd yyyy"));    
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> MMM-dd-yyyy " + DateTime.Today.ToString("MMM-dd-yyyy"));
            Response.Write("<br /> MMM/dd/yyyy " + DateTime.Today.ToString("MMM/dd/yyyy"));
            Response.Write("<br /> MMM dd yyyy " + DateTime.Today.ToString("MMM dd yyyy")); 
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> yyyy-MM-dd " + DateTime.Today.ToString("yyyy-MM-dd"));
            Response.Write("<br /> yyyy/MM/dd " + DateTime.Today.ToString("yyyy/MM/dd"));
            Response.Write("<br /> yyyy MM dd " + DateTime.Today.ToString("yyyy MM dd")); 
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> yyyy-MM-dd h:m:s " + DateTime.Now.ToString("yyyy-MM-dd h:m:s"));
            Response.Write("<br /> yyyy/MM/dd h:m:s " + DateTime.Now.ToString("yyyy/MM/dd h:m:s"));
            Response.Write("<br /> yyyy MM dd h:m:s " + DateTime.Now.ToString("yyyy MM dd h:m:s"));   
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> yyyy-MM-dd hh:mm:ss " + DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"));
            Response.Write("<br /> yyyy/MM/dd hh:mm:ss " + DateTime.Now.ToString("yyyy/MM/dd hh:mm:ss"));
            Response.Write("<br /> yyyy MM dd hh:mm:ss " + DateTime.Now.ToString("yyyy MM dd hh:mm:ss"));
            Response.Write("<br />" + "------------------------");
            
            Response.Write("<br /> yyyy-MM-dd H:m:s " + DateTime.Now.ToString("yyyy-MM-dd H:m:s"));
            Response.Write("<br /> yyyy/MM/dd H:m:s " + DateTime.Now.ToString("yyyy/MM/dd H:m:s"));
            Response.Write("<br /> yyyy MM dd H:m:s " + DateTime.Now.ToString("yyyy MM dd H:m:s"));      
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> yyyy-MM-dd HH:mm:ss " + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            Response.Write("<br /> yyyy/MM/dd HH:mm:ss " + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"));
            Response.Write("<br /> yyyy MM dd HH:mm:ss " + DateTime.Now.ToString("yyyy MM dd HH:mm:ss")); 
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> yyyy-MM-dd HH:mm:ss tt " + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss tt"));
            Response.Write("<br /> yyyy/MM/dd HH:mm:ss tt " + DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss tt"));
            Response.Write("<br /> yyyy MM dd HH:mm:ss tt " + DateTime.Now.ToString("yyyy MM dd HH:mm:ss tt"));  

            Response.Write("<br />" + "------------------------");

            DateTime now = DateTime.Now;
            Response.Write("<br /> d " + now.ToString("d"));  
            Response.Write("<br /> D " + now.ToString("D"));  
            Response.Write("<br /> f " + now.ToString("f"));  
            Response.Write("<br /> F " + now.ToString("F"));  
            Response.Write("<br /> g " + now.ToString("g"));  
            Response.Write("<br /> G " + now.ToString("G"));  
            Response.Write("<br /> m " + now.ToString("m"));  
            Response.Write("<br /> M " + now.ToString("M"));  
            Response.Write("<br /> o " + now.ToString("o"));  
            Response.Write("<br /> O " + now.ToString("O"));  
            Response.Write("<br /> s " + now.ToString("s"));  
            Response.Write("<br /> t " + now.ToString("t"));  
            Response.Write("<br /> T " + now.ToString("T"));  
            Response.Write("<br /> u " + now.ToString("u"));  
            Response.Write("<br /> U " + now.ToString("U"));       
            Response.Write("<br /> y " + now.ToString("y"));  
            Response.Write("<br /> Y " + now.ToString("Y"));
            Response.Write("<br />" + "------------------------");

            Response.Write("<br /> System default " + now.ToLongDateString()); 
            Response.Write("<br /> System default " + now.ToLongTimeString());  
            Response.Write("<br /> System default " + now.ToShortDateString());  
            Response.Write("<br /> System default " + now.ToShortTimeString());    
            Response.Write("<br /> System default " + now.ToString());      
        }
    }
}

Asp.net with vb.net

Protected Sub btnShowDatFormats_Click(sender As Object, e As System.EventArgs) Handles btnShowDatFormats.Click
			//Create Current DateTime Object
            DateTime dt = DateTime.Now;
            Response.Write("System Default Format " & dt.ToString()&"<br />");

            string dts = "10/25/2019";
            dt = DateTime.ParseExact(dts, "MM/dd/yyyy", System.Globalization.CultureInfo.InvariantCulture);
            Response.Write("System Default Format "&dt.ToString() & "<br />");
            

            Response.Write("<br /> dd-MM-yyyy " & DateTime.Today.ToString("dd-MM-yyyy"));  
            Response.Write("<br /> dd/MM/yyyy " & DateTime.Today.ToString("dd/MM/yyyy"));  
            Response.Write("<br /> dd MM yyyy " & DateTime.Today.ToString("dd MM yyyy"));  
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> dd-MM-yy " & DateTime.Today.ToString("dd-MM-yy"));  
            Response.Write("<br /> dd/MM/yy " & DateTime.Today.ToString("dd/MM/yy"));  
            Response.Write("<br /> dd MM yy " & DateTime.Today.ToString("dd MM yy"));   
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> ddd-dd-MM-yy " & DateTime.Today.ToString("ddd-dd-MM-yy")); 
            Response.Write("<br /> ddd/dd/MM/yy " & DateTime.Today.ToString("ddd/dd/MM/yy")); 
            Response.Write("<br /> ddd dd MM yy " & DateTime.Today.ToString("ddd dd MM yy"));  
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> dddd-dd-MM-yy " & DateTime.Today.ToString("dddd-dd-MM-yy"));  
            Response.Write("<br /> dddd/dd/MM/yy " & DateTime.Today.ToString("dddd/dd/MM/yy"));  
            Response.Write("<br /> dddd dd MM yy " & DateTime.Today.ToString("dddd dd MM yy"));    
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> dd-MMM-yyyy " & DateTime.Today.ToString("dd-MMM-yyyy"));    


            Response.Write("<br /> dd/MMM/yyyy " & DateTime.Today.ToString("dd/MMM/yyyy"));  
            Response.Write("<br /> dd MMM yyyy " & DateTime.Today.ToString("dd MMM yyyy")); 
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> dd-MMMM-yyyy " & DateTime.Today.ToString("dd-MMMM-yyyy"));  
            Response.Write("<br /> dd/MMMM/yyyy " & DateTime.Today.ToString("dd/MMMM/yyyy"));  
            Response.Write("<br /> dd MMMM yyyy " & DateTime.Today.ToString("dd MMMM yyyy"));
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> MM-dd-yyyy " & DateTime.Today.ToString("MM-dd-yyyy")); 
            Response.Write("<br /> MM/dd/yyyy " & DateTime.Today.ToString("MM/dd/yyyy")); 
            Response.Write("<br /> MM dd yyyy " & DateTime.Today.ToString("MM dd yyyy"));    
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> MMM-dd-yyyy " & DateTime.Today.ToString("MMM-dd-yyyy"));
            Response.Write("<br /> MMM/dd/yyyy " & DateTime.Today.ToString("MMM/dd/yyyy"));
            Response.Write("<br /> MMM dd yyyy " & DateTime.Today.ToString("MMM dd yyyy")); 
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> yyyy-MM-dd " & DateTime.Today.ToString("yyyy-MM-dd"));
            Response.Write("<br /> yyyy/MM/dd " & DateTime.Today.ToString("yyyy/MM/dd"));
            Response.Write("<br /> yyyy MM dd " & DateTime.Today.ToString("yyyy MM dd")); 
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> yyyy-MM-dd h:m:s " & DateTime.Now.ToString("yyyy-MM-dd h:m:s"));
            Response.Write("<br /> yyyy/MM/dd h:m:s " & DateTime.Now.ToString("yyyy/MM/dd h:m:s"));
            Response.Write("<br /> yyyy MM dd h:m:s " & DateTime.Now.ToString("yyyy MM dd h:m:s"));   
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> yyyy-MM-dd hh:mm:ss " & DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss"));
            Response.Write("<br /> yyyy/MM/dd hh:mm:ss " & DateTime.Now.ToString("yyyy/MM/dd hh:mm:ss"));
            Response.Write("<br /> yyyy MM dd hh:mm:ss " & DateTime.Now.ToString("yyyy MM dd hh:mm:ss"));
            Response.Write("<br />" & "------------------------");
            
            Response.Write("<br /> yyyy-MM-dd H:m:s " & DateTime.Now.ToString("yyyy-MM-dd H:m:s"));
            Response.Write("<br /> yyyy/MM/dd H:m:s " & DateTime.Now.ToString("yyyy/MM/dd H:m:s"));
            Response.Write("<br /> yyyy MM dd H:m:s " & DateTime.Now.ToString("yyyy MM dd H:m:s"));      
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> yyyy-MM-dd HH:mm:ss " & DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            Response.Write("<br /> yyyy/MM/dd HH:mm:ss " & DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"));
            Response.Write("<br /> yyyy MM dd HH:mm:ss " & DateTime.Now.ToString("yyyy MM dd HH:mm:ss")); 
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> yyyy-MM-dd HH:mm:ss tt " & DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss tt"));
            Response.Write("<br /> yyyy/MM/dd HH:mm:ss tt " & DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss tt"));
            Response.Write("<br /> yyyy MM dd HH:mm:ss tt " & DateTime.Now.ToString("yyyy MM dd HH:mm:ss tt"));  

            Response.Write("<br />" & "------------------------");

            DateTime now = DateTime.Now;
            Response.Write("<br /> d " & now.ToString("d"));  
            Response.Write("<br /> D " & now.ToString("D"));  
            Response.Write("<br /> f " & now.ToString("f"));  
            Response.Write("<br /> F " & now.ToString("F"));  
            Response.Write("<br /> g " & now.ToString("g"));  
            Response.Write("<br /> G " & now.ToString("G"));  
            Response.Write("<br /> m " & now.ToString("m"));  
            Response.Write("<br /> M " & now.ToString("M"));  
            Response.Write("<br /> o " & now.ToString("o"));  
            Response.Write("<br /> O " & now.ToString("O"));  
            Response.Write("<br /> s " & now.ToString("s"));  
            Response.Write("<br /> t " & now.ToString("t"));  
            Response.Write("<br /> T " & now.ToString("T"));  
            Response.Write("<br /> u " & now.ToString("u"));  
            Response.Write("<br /> U " & now.ToString("U"));       
            Response.Write("<br /> y " & now.ToString("y"));  
            Response.Write("<br /> Y " & now.ToString("Y"));
            Response.Write("<br />" & "------------------------");

            Response.Write("<br /> System default " & now.ToLongDateString()); 
            Response.Write("<br /> System default " & now.ToLongTimeString());  
            Response.Write("<br /> System default " & now.ToShortDateString());  
            Response.Write("<br /> System default " & now.ToShortTimeString());    
            Response.Write("<br /> System default " & now.ToString());    
End Sub

OUTPUT: System Default Format 9/22/2019 3:47:02 AM System Default Format 10/25/2019 12:00:00 AM dd-MM-yyyy 22-09-2019 dd/MM/yyyy 22/09/2019 dd MM yyyy 22 09 2019 ------------------------ dd-MM-yy 22-09-19 dd/MM/yy 22/09/19 dd MM yy 22 09 19 ------------------------ ddd-dd-MM-yy Sun-22-09-19 ddd/dd/MM/yy Sun/22/09/19 ddd dd MM yy Sun 22 09 19 ------------------------ dddd-dd-MM-yy Sunday-22-09-19 dddd/dd/MM/yy Sunday/22/09/19 dddd dd MM yy Sunday 22 09 19 ------------------------ dd-MMM-yyyy 22-Sep-2019 dd/MMM/yyyy 22/Sep/2019 dd MMM yyyy 22 Sep 2019 ------------------------ dd-MMMM-yyyy 22-September-2019 dd/MMMM/yyyy 22/September/2019 dd MMMM yyyy 22 September 2019 ------------------------ MM-dd-yyyy 09-22-2019 MM/dd/yyyy 09/22/2019 MM dd yyyy 09 22 2019 ------------------------ MMM-dd-yyyy Sep-22-2019 MMM/dd/yyyy Sep/22/2019 MMM dd yyyy Sep 22 2019 ------------------------ yyyy-MM-dd 2019-09-22 yyyy/MM/dd 2019/09/22 yyyy MM dd 2019 09 22 ------------------------ yyyy-MM-dd h:m:s 2019-09-22 3:47:2 yyyy/MM/dd h:m:s 2019/09/22 3:47:2 yyyy MM dd h:m:s 2019 09 22 3:47:2 ------------------------ yyyy-MM-dd hh:mm:ss 2019-09-22 03:47:02 yyyy/MM/dd hh:mm:ss 2019/09/22 03:47:02 yyyy MM dd hh:mm:ss 2019 09 22 03:47:02 ------------------------ yyyy-MM-dd H:m:s 2019-09-22 3:47:2 yyyy/MM/dd H:m:s 2019/09/22 3:47:2 yyyy MM dd H:m:s 2019 09 22 3:47:2 ------------------------ yyyy-MM-dd HH:mm:ss 2019-09-22 03:47:02 yyyy/MM/dd HH:mm:ss 2019/09/22 03:47:02 yyyy MM dd HH:mm:ss 2019 09 22 03:47:02 ------------------------ yyyy-MM-dd HH:mm:ss tt 2019-09-22 03:47:02 AM yyyy/MM/dd HH:mm:ss tt 2019/09/22 03:47:02 AM yyyy MM dd HH:mm:ss tt 2019 09 22 03:47:02 AM ------------------------ d 9/22/2019 D Sunday, September 22, 2019 f Sunday, September 22, 2019 3:47 AM F Sunday, September 22, 2019 3:47:02 AM g 9/22/2019 3:47 AM G 9/22/2019 3:47:02 AM m September 22 M September 22 o 2019-09-22T03:47:02.7424290-07:00 O 2019-09-22T03:47:02.7424290-07:00 s 2019-09-22T03:47:02 t 3:47 AM T 3:47:02 AM u 2019-09-22 03:47:02Z U Sunday, September 22, 2019 10:47:02 AM y September 2019 Y September 2019 ------------------------ System default Sunday, September 22, 2019 System default 3:47:02 AM System default 9/22/2019 System default 3:47 AM System default 9/22/2019 3:47:02 AM

As per Microsoft the following table describes the custom date and time format specifiers

Format specifier	Description	Examples
"d"	The day of the month, from 1 through 31. More information: The "d" Custom Format Specifier.	2009-06-01T13:45:30 -> 1 2009-06-15T13:45:30 -> 15
"dd"	The day of the month, from 01 through 31. More information: The "dd" Custom Format Specifier.	2009-06-01T13:45:30 -> 01 2009-06-15T13:45:30 -> 15
"ddd"	The abbreviated name of the day of the week. More information:The "ddd" Custom Format Specifier.	2009-06-15T13:45:30 -> Mon (en-US) 2009-06-15T13:45:30 -> ?? (ru-RU) 2009-06-15T13:45:30 -> lun. (fr-FR)
"dddd"	The full name of the day of the week. More information: The "dddd" Custom Format Specifier.	2009-06-15T13:45:30 -> Monday (en-US) 2009-06-15T13:45:30 -> ??????????? (ru-RU) 2009-06-15T13:45:30 -> lundi (fr-FR)
"f"	The tenths of a second in a date and time value. More information: The "f" Custom Format Specifier.	2009-06-15T13:45:30.6170000 -> 6 2009-06-15T13:45:30.05 -> 0
"ff"	The hundredths of a second in a date and time value. More information: The "ff" Custom Format Specifier.	2009-06-15T13:45:30.6170000 -> 61 2009-06-15T13:45:30.0050000 -> 00
"fff"	The milliseconds in a date and time value. More information: The "fff" Custom Format Specifier.	6/15/2009 13:45:30.617 -> 617 6/15/2009 13:45:30.0005 -> 000
"ffff"	The ten thousandths of a second in a date and time value. More information: The "ffff" Custom Format Specifier.	2009-06-15T13:45:30.6175000 -> 6175 2009-06-15T13:45:30.0000500 -> 0000
"fffff"	The hundred thousandths of a second in a date and time value. More information: The "fffff" Custom Format Specifier.	2009-06-15T13:45:30.6175400 -> 61754 6/15/2009 13:45:30.000005 -> 00000
"ffffff"	The millionths of a second in a date and time value. More information: The "ffffff" Custom Format Specifier.	2009-06-15T13:45:30.6175420 -> 617542 2009-06-15T13:45:30.0000005 -> 000000
"fffffff"	The ten millionths of a second in a date and time value. More information: The "fffffff" Custom Format Specifier.	2009-06-15T13:45:30.6175425 -> 6175425 2009-06-15T13:45:30.0001150 -> 0001150
"F"	If non-zero, the tenths of a second in a date and time value. More information: The "F" Custom Format Specifier.	2009-06-15T13:45:30.6170000 -> 6 2009-06-15T13:45:30.0500000 -> (no output)
"FF"	If non-zero, the hundredths of a second in a date and time value. More information: The "FF" Custom Format Specifier.	2009-06-15T13:45:30.6170000 -> 61 2009-06-15T13:45:30.0050000 -> (no output)
"FFF"	If non-zero, the milliseconds in a date and time value. More information: The "FFF" Custom Format Specifier.	2009-06-15T13:45:30.6170000 -> 617 2009-06-15T13:45:30.0005000 -> (no output)
"FFFF"	If non-zero, the ten thousandths of a second in a date and time value. More information: The "FFFF" Custom Format Specifier.	2009-06-15T13:45:30.5275000 -> 5275 2009-06-15T13:45:30.0000500 -> (no output)
"FFFFF"	If non-zero, the hundred thousandths of a second in a date and time value. More information: The "FFFFF" Custom Format Specifier.	2009-06-15T13:45:30.6175400 -> 61754 2009-06-15T13:45:30.0000050 -> (no output)
"FFFFFF"	If non-zero, the millionths of a second in a date and time value. More information: The "FFFFFF" Custom Format Specifier.	2009-06-15T13:45:30.6175420 -> 617542 2009-06-15T13:45:30.0000005 -> (no output)
"FFFFFFF"	If non-zero, the ten millionths of a second in a date and time value. More information: The "FFFFFFF" Custom Format Specifier.	2009-06-15T13:45:30.6175425 -> 6175425 2009-06-15T13:45:30.0001150 -> 000115
"g", "gg"	The period or era. More information: The "g" or "gg" Custom Format Specifier.	2009-06-15T13:45:30.6170000 -> A.D.
"h"	The hour, using a 12-hour clock from 1 to 12. More information:The "h" Custom Format Specifier.	2009-06-15T01:45:30 -> 1 2009-06-15T13:45:30 -> 1
"hh"	The hour, using a 12-hour clock from 01 to 12. More information: The "hh" Custom Format Specifier.	2009-06-15T01:45:30 -> 01 2009-06-15T13:45:30 -> 01
"H"	The hour, using a 24-hour clock from 0 to 23. More information: The "H" Custom Format Specifier.	2009-06-15T01:45:30 -> 1 2009-06-15T13:45:30 -> 13
"HH"	The hour, using a 24-hour clock from 00 to 23. More information:The "HH" Custom Format Specifier.	2009-06-15T01:45:30 -> 01 2009-06-15T13:45:30 -> 13
"K"	Time zone information. More information: The "K" Custom Format Specifier.	With DateTime values: 2009-06-15T13:45:30, Kind Unspecified -> 2009-06-15T13:45:30, Kind Utc -> Z 2009-06-15T13:45:30, Kind Local -> -07:00 (depends on local computer settings) With DateTimeOffset values: 2009-06-15T01:45:30-07:00 --> -07:00 2009-06-15T08:45:30+00:00 --> +00:00
"m"	The minute, from 0 through 59. More information: The "m" Custom Format Specifier.	2009-06-15T01:09:30 -> 9 2009-06-15T13:29:30 -> 29
"mm"	The minute, from 00 through 59. More information: The "mm" Custom Format Specifier.	2009-06-15T01:09:30 -> 09 2009-06-15T01:45:30 -> 45
"M"	The month, from 1 through 12. More information: The "M" Custom Format Specifier.	2009-06-15T13:45:30 -> 6
"MM"	The month, from 01 through 12. More information: The "MM" Custom Format Specifier.	2009-06-15T13:45:30 -> 06
"MMM"	The abbreviated name of the month. More information: The "MMM" Custom Format Specifier.	2009-06-15T13:45:30 -> Jun (en-US) 2009-06-15T13:45:30 -> juin (fr-FR) 2009-06-15T13:45:30 -> Jun (zu-ZA)
"MMMM"	The full name of the month. More information: The "MMMM" Custom Format Specifier.	2009-06-15T13:45:30 -> June (en-US) 2009-06-15T13:45:30 -> juni (da-DK) 2009-06-15T13:45:30 -> uJuni (zu-ZA)
"s"	The second, from 0 through 59. More information: The "s" Custom Format Specifier.	2009-06-15T13:45:09 -> 9
"ss"	The second, from 00 through 59. More information: The "ss" Custom Format Specifier.	2009-06-15T13:45:09 -> 09
"t"	The first character of the AM/PM designator. More information: The "t" Custom Format Specifier.	2009-06-15T13:45:30 -> P (en-US) 2009-06-15T13:45:30 -> ? (ja-JP) 2009-06-15T13:45:30 -> (fr-FR)
"tt"	The AM/PM designator. More information: The "tt" Custom Format Specifier.	2009-06-15T13:45:30 -> PM (en-US) 2009-06-15T13:45:30 -> ?? (ja-JP) 2009-06-15T13:45:30 -> (fr-FR)
"y"	The year, from 0 to 99. More information: The "y" Custom Format Specifier.	0001-01-01T00:00:00 -> 1 0900-01-01T00:00:00 -> 0 1900-01-01T00:00:00 -> 0 2009-06-15T13:45:30 -> 9 2019-06-15T13:45:30 -> 19
"yy"	The year, from 00 to 99. More information: The "yy" Custom Format Specifier.	0001-01-01T00:00:00 -> 01 0900-01-01T00:00:00 -> 00 1900-01-01T00:00:00 -> 00 2019-06-15T13:45:30 -> 19
"yyy"	The year, with a minimum of three digits. More information: The "yyy" Custom Format Specifier.	0001-01-01T00:00:00 -> 001 0900-01-01T00:00:00 -> 900 1900-01-01T00:00:00 -> 1900 2009-06-15T13:45:30 -> 2009
"yyyy"	The year as a four-digit number. More information: The "yyyy" Custom Format Specifier.	0001-01-01T00:00:00 -> 0001 0900-01-01T00:00:00 -> 0900 1900-01-01T00:00:00 -> 1900 2009-06-15T13:45:30 -> 2009
"yyyyy"	The year as a five-digit number. More information: The "yyyyy" Custom Format Specifier.	0001-01-01T00:00:00 -> 00001 2009-06-15T13:45:30 -> 02009
"z"	Hours offset from UTC, with no leading zeros. More information: The "z" Custom Format Specifier.	2009-06-15T13:45:30-07:00 -> -7
"zz"	Hours offset from UTC, with a leading zero for a single-digit value. More information: The "zz" Custom Format Specifier.	2009-06-15T13:45:30-07:00 -> -07
"zzz"	Hours and minutes offset from UTC. More information: The "zzz" Custom Format Specifier.	2009-06-15T13:45:30-07:00 -> -07:00
":"	The time separator. More information: The ":" Custom Format Specifier.	2009-06-15T13:45:30 -> : (en-US) 2009-06-15T13:45:30 -> . (it-IT) 2009-06-15T13:45:30 -> : (ja-JP)
"/"	The date separator. More Information: The "/" Custom Format Specifier.	2009-06-15T13:45:30 -> / (en-US) 2009-06-15T13:45:30 -> - (ar-DZ) 2009-06-15T13:45:30 -> . (tr-TR)
"string" 'string'	Literal string delimiter. More information: Character literals.	2009-06-15T13:45:30 ("arr:" h:m t) -> arr: 1:45 P 2009-06-15T13:45:30 ('arr:' h:m t) -> arr: 1:45 P
%	Defines the following character as a custom format specifier. More information: Using Single Custom Format Specifiers.	2009-06-15T13:45:30 (%h) -> 1
\	The escape character. More information: Character literals and Using the Escape Character.	2009-06-15T13:45:30 (h \h) -> 1 h
Any other character	The character is copied to the result string unchanged. More information: Character literals.	2009-06-15T01:45:30 (arr hh:mm t) -> arr 01:45 A

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Date and Time formats in asp.net using C-Sharp, vb.net

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