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DateTime in C#
Date and Time in C# are handled by the DateTime class in C#, which provides properties and methods to format dates in different datetime formats.
The following table describes various C# DateTime formats and their results. Here we see all the patterns of the C# DateTime, format, and results
| Format | Result |
| DateTime.Now.ToString(“MM/dd/yyyy”) | 05/29/2015 |
| DateTime.Now.ToString(“dddd, dd MMMM yyyy”) | Friday, 29 May 2015 |
| DateTime.Now.ToString(“dddd, dd MMMM yyyy”) | Friday, 29 May 2015 05:50 |
| DateTime.Now.ToString(“dddd, dd MMMM yyyy”) | Friday, 29 May 2015 05:50 AM |
| DateTime.Now.ToString(“dddd, dd MMMM yyyy”) | Friday, 29 May 2015 5:50 |
| DateTime.Now.ToString(“dddd, dd MMMM yyyy”) | Friday, 29 May 2015 5:50 AM |
| DateTime.Now.ToString(“dddd, dd MMMM yyyy HH:mm:ss”) | Friday, 29 May 2015 05:50:06 |
| DateTime.Now.ToString(“MM/dd/yyyy HH:mm”) | 05/29/2015 05:50 |
| DateTime.Now.ToString(“MM/dd/yyyy hh:mm tt”) | 05/29/2015 05:50 AM |
| DateTime.Now.ToString(“MM/dd/yyyy H:mm”) | 05/29/2015 5:50 |
| DateTime.Now.ToString(“MM/dd/yyyy h:mm tt”) | 05/29/2015 5:50 AM |
| DateTime.Now.ToString(“MM/dd/yyyy HH:mm:ss”) | 05/29/2015 05:50:06 |
| DateTime.Now.ToString(“MMMM dd”) | May 29 |
| DateTime.Now.ToString(“yyyy’-‘MM’-‘dd’T’HH’:’mm’:’ss.fffffffK”) | 2015-05-16T05:50:06.7199222-04:00 |
| DateTime.Now.ToString(“ddd, dd MMM yyy HH’:’mm’:’ss ‘GMT’”) | Fri, 16 May 2015 05:50:06 GMT |
| DateTime.Now.ToString(“yyyy’-‘MM’-‘dd’T’HH’:’mm’:’ss”) | 2015-05-16T05:50:06 |
| DateTime.Now.ToString(“HH:mm”) | 05:50 |
| DateTime.Now.ToString(“hh:mm tt”) | 05:50 AM |
| DateTime.Now.ToString(“H:mm”) | 5:50 |
| DateTime.Now.ToString(“h:mm tt”) | 5:50 AM |
| DateTime.Now.ToString(“HH:mm:ss”) | 05:50:06 |
| DateTime.Now.ToString(“yyyy MMMM”) | 2015 May |
Basic Stuctures:
// Declaration without initialization
DateTime dateTimeVariable;
// Declaration with initialization to a specific date and time
DateTime dateTimeVariable = new DateTime(year, month, day, hour, minute, second);
// Declaration with initialization to the current date and time
DateTime currentDateTime = DateTime.Now;
Example:
using System;
class CurrentDateTimeExample
{
public static void Main()
{
DateTime Default = DateTime.Now; // Define date time format default from system
string Custom = DateTime.Now.ToString(“MM/dd/yyyy hh:mm tt”); // Define date time by custom format
Console.WriteLine(“Current Date and Time: ” + Default);
Console.WriteLine(“Current Date and Time: ” + Custom);
}
}
d: Represents the day of the month as a number from 1 through 31.
dd: Represents the day of the month as a number from 01 through 31.
ddd: Represents the abbreviated name of the day (Mon, Tues, Wed, etc).
dddd: Represents the full name of the day (Monday, Tuesday, etc).
h: 12-hour clock hour (e.g. 4).
hh: 12-hour clock, with a leading 0 (e.g. 06)
H: 24-hour clock hour (e.g. 15)
HH: 24-hour clock hour, with a leading 0 (e.g. 22)
m: Minutes
mm: Minutes with a leading zero
M: Month number(eg.3)
MM: Month number with leading zero(eg.04)
MMM: Abbreviated Month Name (e.g. Dec)
MMMM: Full month name (e.g. December)
s: Seconds
ss: Seconds with leading zero
t: Abbreviated AM / PM (e.g. A or P)
tt: AM / PM (e.g. AM or PM
y: Year, no leading zero (e.g. 2015 would be 15)
yy: Year, leading zero (e.g. 2015 would be 015)
yyy: Year, (e.g. 2015)
yyyy: Year, (e.g. 2015)
K: Represents the time zone information of a date and time value (e.g. +05:00)
z: With DateTime values represent the signed offset of the local operating system’s time zone from
Coordinated Universal Time (UTC), measured in hours. (e.g. +6)
zz: As z, but with leading zero (e.g. +06)
zzz: With DateTime values represents the signed offset of the local operating system’s time zone from UTC, measured in hours and minutes. (e.g. +06:00)
f: Represents the most significant digit of the seconds fraction; that is, it represents the tenths of a second in a date and time value.
ff: Represents the two most significant digits of the second’s fraction in date and time
fff: Represents the three most significant digits of the second’s fraction; that is, it represents the milliseconds in a date and time value.
ffff: Represents the four most significant digits of the second’s fraction; that is, it represents the ten-thousandths of a second in a date and time value. While it is possible to display the ten thousandths of a second component of a time value, that value may not be meaningful.
fffff: Represents the five most significant digits of the second’s fraction; that is, it represents the hundred-thousandths of a second in a date and time value.
ffffff: Represents the six most significant digits of the second’s fraction; that is, it represents the millionths of a second in a date and time value.
fffffff: Represents the seven most significant digits of the second’s fraction; that is, it represents the ten-millionths of a second in a date and time value.
Task:
• Current Date and Time:
Print the current date and time to the console using DateTime.Now.
• Date Formatting:
Print the current date in the format “yyyy-MM-dd” (e.g., “2024-07-06”).
• Date Comparison:
Create two DateTime objects representing different dates.
Compare these dates to determine which one is earlier or if they are equal.
• Date Manipulation:
Create a DateTime object representing today’s date.
Add 5 days to this date and print the result.
• Age Calculation:
Ask the user to enter their birthdate.
Calculate their age based on the current date and print it.
