DateTime
DateTime(year, month, day)
DateTime date1 = new DateTime(2025, 12, 25); Console.WriteLine(date1.ToString());
// Ausgabe: 12/25/2025 12:00:00 AM
DateTime(year, month, day, hour, minute, second)
DateTime date2 = new DateTime(2022, 12, 25, 10, 30, 50); Console.WriteLine(date1.ToString());
// Ausgabe: 12/25/2022 10:30:00 AM }
Creating TimeSpan object
var duration = new TimeSpan(30, 0, 0, 0); // one month(as 30 days)
DateTime newDate1 = DateTime.Now.Add(duration);
Console.WriteLine(newDate1);
AddYears (Months, Days, Hours, Minutes, Seconds)
DateTime today = DateTime.Now;
DateTime newDate2 = today.AddDays(3);
Console.WriteLine(newDate2);
DateTime Parse
string dateString = "Wed Dec 30, 2015";
DateTime dateTime12 = DateTime.Parse(dateString); // 12/30/2015 12:00:00 AM
Date Difference
var date1 = new DateTime(2025, 3, 10, 2, 15, 10);
var date2 = new DateTime(2025, 7, 15, 6, 30, 20);
var date3 = new DateTime(2025, 12, 28, 10, 45, 30);
TimeSpan diff1 = date2.Subtract(date1);
DateTime date4 = date3.Subtract(diff1);
TimeSpan diff2 = date3 - date2;
DateTime date5 = date2 - diff1;
DateTime Properties
DateTime myDate = new DateTime(2025, 12, 25, 10, 30, 45);
int year = myDate.Year; // 2015
int month = myDate.Month; // 12
int day = myDate.Day; // 25
int hour = myDate.Hour; // 10
int minute = myDate.Minute; // 30
int second = myDate.Second; // 45
DayOfWeek
It specifies day of the week like Sunday, Monday etc. It is an enum which starts from Sunday to Saturday. If you cast the weekofday value to integer then it starts from Zero (0) for Sunday to Six (6) for Saturday.
DateTime myDate = new DateTime(2025, 12, 25, 10, 30, 45);
int weekDay = (int)myDate.DayOfWeek; // 4 (numeric value of weekday)
string weekDay2 = myDate.DayOfWeek.ToString(); // name of day (Thursday)
DateTime dt = new DateTime(2015, 12, 25);
bool isEqual = dt.DayOfWeek == DayOfWeek.Thursday); // False
bool isEqual = dt.DayOfWeek == DayOfWeek.Friday); // True
DateTime Formatting
DateTime tempDate = new DateTime(2025, 2, 24);
Console.WriteLine(tempDate.ToString("MMMM dd, yyyy"));
| Specifier | Description | Output |
|---|---|---|
| d | Short Date | 12/8/2015 |
| D | Long Date | Tuesday, December 08, 2015 |
| t | Short Time | 3:15 PM |
| T | Long Time | 3:15:19 PM |
| f | Full date and time | Tuesday, December 08, 2015 3:15 PM |
| F | Full date and time (long) | Tuesday, December 08, 2015 3:15:19 PM |
| g | Default date and time | 12/8/2015 15:15 |
| G | Default date and time (long) | 12/8/2015 15:15 |
| M | Day / Month | 8-Dec |
| r | RFC1123 date | Tue, 08 Dec 2015 15:15:19 GMT |
| s | Sortable date/time | 2015-12-08T15:15:19 |
| u | Universal time, local timezone | 2015-12-08 15:15:19Z |
| Y | Month / Year | December, 2015 |
| dd | Day | 8 |
| ddd | Short Day Name | Tue |
| dddd | Full Day Name | Tuesday |
| hh | 2 digit hour | 3 |
| HH | 2 digit hour (24 hour) | 15 |
| mm | 2 digit minute | 15 |
| MM | Month | 12 |
| MMM | Short Month name | Dec |
| MMMM | Month name | December |
| ss | seconds | 19 |
| fff | milliseconds | 120 |
| FFF | milliseconds without trailing zero | 12 |
| tt | AM/PM | PM |
| yy | 2 digit year | 15 |
| yyyy | 4 digit year | 2015 |
| : | Hours, minutes, seconds separator, e.g. {0:hh:mm:ss} | 9:08:59 |
| / | Year, month , day separator, e.g. {0:dd/MM/yyyy} | 8/4/2007 |
Get current Time Zone
string current = TimeZone.CurrentTimeZone.StandardName;
Console.WriteLine(current);
Get All Time Zones
foreach (TimeZoneInfo z in TimeZoneInfo.GetSystemTimeZones())
{
Console.WriteLine(z.Id);
}
Convert Date to UTC
//Convert any date from your time-zone to UTC
DateTime timeUTC = TimeZone.CurrentTimeZone.ToUniversalTime(DateTime.Now);
Console.WriteLine(timeUTC);
Get Time in specific Time Zone
TimeZoneInfo nzTimeZone = TimeZoneInfo.FindSystemTimeZoneById("New Zealand Standard Time");
DateTime nzTime = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, nzTimeZone);
Console.WriteLine($"Aktuelle Zeit in Neuseeland: {nzTime}");
Get Current Culture Name
string currentCulture = Thread.CurrentThread.CurrentCulture.DisplayName;
Get DateTime based on Culture
using System.Globalization;
DateTime currentTime = DateTime.Now;
string dateInUSA = currentTime.ToString("D", new CultureInfo("en-US"));
string dateInHindi = currentTime.ToString("D", new CultureInfo("hi-IN"));
string dateInJapan = currentTime.ToString("D", new CultureInfo("ja-JP"));
Convert Current DateTime to Different Culture
DateTime originalResult = new DateTime(2025, 01, 09);
string frenchTDate = originalResult.ToString("D", new CultureInfo("fr-FR"));