Uporabili smo DateTime, ko je bilo treba delati z datumi in časi v C#.
Datum in čas lahko oblikujemo v različnih formatih z lastnostmi in metodami DateTime./p>
Vrednost DateTime je med polnočjo 12:00:00, 1. januarja 0001, in 23:59:59, 31. decembra 9999 AD.
Tukaj bomo razložili, kako ustvariti DateTime v C#.
Imamo različne načine za ustvarjanje objekta DateTime. Objekt DateTime ima čas, kulturo, datum, lokalizacijo, milisekunde.
Tukaj imamo kodo, ki prikazuje različne konstruktorje, ki jih struktura DateTime uporablja za ustvarjanje objektov DateTime.
// From DateTime create the Date and Time DateTime DOB= new DateTime(19, 56, 8, 12, 8, 12, 23); // From String creation of DateTime string DateString= '8/12/1956 7:10:24 AM'; DateTime dateFromString = DateTime.Parse(DateString, System.Globalization.CultureInfo.InvariantCulture); Console.WriteLine(dateFromString.ToString()); // Empty DateTime DateTime EmpDateTime= new DateTime(); // Just date DateTime OnlyDate= new DateTime(2002, 10, 18); // DateTime from Ticks DateTime OnlyTime= new DateTime(10000000); // Localization with DateTime DateTime DateTimewithKind = new DateTime(1976, 7, 10, 7, 10, 24, DateTimeKind.Local); // DateTime with date, time and milliseconds DateTime WithMilliseconds= new DateTime(2010, 12, 15, 5, 30, 45, 100);
Lastnosti DateTime v C#
DateTime ima lastnost Datum in čas. Iz DateTime lahko najdemo datum in uro. DateTime vsebuje tudi druge lastnosti, kot so ura, minuta, sekunda, milisekunda, leto, mesec in dan.
Druge lastnosti DateTime so:
- Ime dneva lahko pridobimo iz tedna s pomočjo lastnosti DayOfWeek.
- Da bi dobili dan v letu, bomo uporabili lastnost DayOfYear.
- Za pridobitev časa v DateTime uporabimo lastnost TimeOfDay.
- Lastnost Today bo vrnila objekt DateTime, ki ima današnjo vrednost. Vrednost časa je 12:00:00
- Lastnost Now bo vrnila predmet DateTime, ki ima trenutni datum in uro.
- Lastnost Utc za DateTime bo vrnila koordinirani univerzalni čas (UTC).
- Ena kljukica predstavlja sto nanosekund v DateTime. Lastnost Ticks za DateTime vrne število tikkov v DateTime.
- Lastnost Kind vrne vrednost, kjer je predstavitev časa izvedena s primerkom, ki temelji na lokalnem času, univerzalnem koordiniranem času (UTC). Prikazuje tudi nedoločeno privzeto vrednost.
Tu vzamemo primer uporabe lastnosti DateTime v kodi C#.
primer:
using System; using System.Collections; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DateTimeProperty = new DateTime(1974, 7, 10, 7, 10, 24); Console.WriteLine('Day:{0}', DateTimeProperty.Day); Console.WriteLine('Month:{0}', DateTimeProperty.Month); Console.WriteLine('Year:{0}', DateTimeProperty.Year); Console.WriteLine('Hour:{0}', DateTimeProperty.Hour); Console.WriteLine('Minute:{0}', DateTimeProperty.Minute); Console.WriteLine('Second:{0}', DateTimeProperty.Second); Console.WriteLine('Millisecond:{0}', DateTimeProperty.Millisecond); Console.WriteLine('Day of Week:{0}', DateTimeProperty.DayOfWeek); Console.WriteLine('Day of Year: {0}', DateTimeProperty.DayOfYear); Console.WriteLine('Time of Day:{0}', DateTimeProperty.TimeOfDay); Console.WriteLine('Tick:{0}', DateTimeProperty.Ticks); Console.WriteLine('Kind:{0}', DateTimeProperty.Kind); } } } Izhod:
Seštevanje in odštevanje datuma in časa v C#
Struktura DateTime ponuja metode za dodajanje in odštevanje datuma in časa objektu DateTime in iz njega. Datum v strukturi DateTime lahko dodajamo in odštevamo objektu DateTime in od njega. Za seštevanje in odštevanje v DateTime uporabljamo strukturo TimeSpan.
Za seštevanje in odštevanje lahko uporabimo metodo Add and Subtract iz predmeta DateTime. Najprej ustvarimo TimeSpan z vrednostmi datuma in časa, kjer uporabimo metodi Dodaj in Odštej.
Tukaj ustvarjamo kodo, ki bo dodala 3 in odštela 30 dni od današnjega dne ter prikazala dan na konzoli.
using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime Day = DateTime.Now; TimeSpan Month = new System.TimeSpan(30, 0, 0, 0); DateTime aDayAfterAMonth = Day.Add(Month); DateTime aDayBeforeAMonth = Day.Subtract(Month); Console.WriteLine('{0:dddd}', aDayAfterAMonth); Console.WriteLine('{0:dddd}', aDayBeforeAMonth); } } } Struktura DateTime vsebuje metode za dodajanje let, dni, ur, minut in sekund.
Za dodajanje različnih komponent objektu DateTime se uporablja metoda Add .
// To Add the Years and Days day.AddYears(2); day.AddDays(12); // Add Hours, Minutes, Seconds, Milliseconds, and Ticks Day.AddHours(4.25); day.AddMinutes(15); day.AddSeconds(45); day.AddMilliseconds(200); day.AddTicks(5000);
DateTime ne vsebuje metode odštevanja. Za odštevanje komponente DateTime bomo uporabili samo metodo odštevanja. Na primer: če moramo odšteti 12 dni od DateTime, lahko ustvarimo drug objekt DateTime ali TimeSpan z 12 dnevi. Zdaj bomo ta predmet odšteli od DateTime. Namesto tega lahko uporabimo tudi operator minus, da od datuma in časa odštejemo DateTime ali TimeSpan.
Zdaj bomo ustvarili kodo, prek katere lahko ustvarimo objekt DateTime in odštejemo še en DateTime in Object TimeSpan. V kodi bomo prikazali odštevanje samo ur, dni ali drugih komponent od DateTime.
DateTime DOB = new DateTime(2000, 10, 20, 12, 15, 45); DateTime SubtractDate = new DateTime(2000, 2, 6, 13, 5, 15); // Use the TimeSpan with 10 days, 2 hrs, 30 mins, 45 seconds, and 100 milliseconds TimeSpan ts = new TimeSpan(10, 2, 30, 45, 100); // Subtract the DateTime TimeSpan Different = DOB.Subtract(SubtractDate); Console.WriteLine(Different.ToString()); // Subtract the TimeSpan DateTime Different2 = DOB.Subtract(ts); Console.WriteLine(Different2.ToString()); // Subtract 10 Days by creating the object SubtractedDays DateTime SubtractedDays = new DateTime(DOB.Year, DOB.Month, DOB.Day - 10); Console.WriteLine(SubtractedDays.ToString()); // Subtract hours, minutes, and seconds with creating the object HoursMinutesSeconds DateTime HoursMinutesSeconds = new DateTime(DOB.Year, DOB.Month, DOB.Day, DOB.Hour - 1, DOB.Minute - 15, DOB.Second - 15); Console.WriteLine(HoursMinutesSeconds.ToString());
Iskanje dni v mesecu
Za iskanje števila dni v mesecu smo uporabili statiko DaysInMonth metoda. Ta metoda iskanja [] vzame parameter v številkah od 1 do 12.
Tukaj bomo napisali kodo, preko katere bomo izvedeli število dni v posameznem mesecu.
Tukaj bomo izvedeli število dni v februarju leta 2020. Rezultat bo 28 dni.
int NumberOfDays = DateTime.DaysInMonth(2004, 2); Console.WriteLine(NumberOfDays);
Z isto tehniko lahko ugotovimo skupno število dni v letu. Za to bomo uporabili metodo DaysInYear.
private int DaysInYear(int year) { int DaysIN= 0; for (int j = 1; j <= 12; j++) { daysin +="DateTime.DaysInMonth(year," j); } return daysin; < pre> <h2>Comparison of two DateTime in C#</h2> <p> <strong>The comparer</strong> static method is used to compare the object of the two datetime. If the objects of both <strong>DateTime</strong> is the same, then the result will be 0. If the first DateTime is earlier, then the result will be 0 else the first DateTime would be later.</p> <p> <strong>Now we will show the comparison of the two datetime objects in C#.</strong> </p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DateOfFirst = new DateTime(2002, 10, 22); DateTime DateOfSecond = new DateTime(2009, 8, 11); int result1 = DateTime.Compare(DateOfFirst, DateOfSecond); if (result1 <0) console.writeline('date of first is earlier'); else if (result1="=" 0) console.writeline('both dates are same'); later'); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-2.webp" alt="DateTime in C#"> <h2>CompareTo Method</h2> <p>CompareTo method is used to compare the two dates. We will assign the DateTime or object in this method.</p> <p>To compare the two DateTime object, we used the CompareTo method. Below we have a C# code to compare the DateTime object.</p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DateOfFirst = new DateTime(2001, 10, 20); DateTime DateOfSecond = new DateTime(2009, 8, 11); int ResultOfComparison = DateOfFirst.CompareTo(DateOfSecond); if (ResultOfComparison <0) console.writeline('date of first is earlier'); else if (resultofcomparison="=" 0) both are same'); later'); } < pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-3.webp" alt="DateTime in C#"> <h2>Formatting of the DateTime in C#</h2> <p>In C#, we can format the DateTime to any type of string format as we want.</p> <p>For the formatting of the DateTime, we used the <strong>GetDateTimeFormats</strong> method, which returns all the possible DateTime formats for the current culture of the computer.</p> <p>Here we have a C# code that returns the array of the strings of all the possible standard formats.</p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DateOfMonth = new DateTime(2020, 02, 25); string[] FormatsOfDate = DateOfMonth.GetDateTimeFormats(); foreach (string format in FormatsOfDate) Console.WriteLine(format); } } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-4.webp" alt="DateTime in C#"> <br> <img src="//techcodeview.com/img/net-framework/10/datetime-c-5.webp" alt="DateTime in C#"> <p>We can overload the <strong>GetDateTimeFormats</strong> method, which takes the format specifier as a parameter and converts the DateTime to that format. To get the desired format, we need to understand the format of the <strong>DateTime</strong> specifiers.</p> <p>We will show it with the code with the pattern in a table.</p> <table class="table"> <tr> <th>Code</th> <th>Pattern</th> </tr> <tr> <td>'d'</td> <td>Short date</td> </tr> <tr> <td>'D'</td> <td>Long date</td> </tr> <tr> <td>'f'</td> <td>Full date time. Short time.</td> </tr> <tr> <td>'F'</td> <td>Full date time. Long Time.</td> </tr> <tr> <td>'g'</td> <td>Generate date time. Long Time.</td> </tr> <tr> <td>'G'</td> <td>General date time. Long Time.</td> </tr> <tr> <td>'M','m.'</td> <td>Month/day</td> </tr> <tr> <td>'O','o'</td> <td>Round trip date/time.</td> </tr> <tr> <td>'R','r'</td> <td>RFC1123</td> </tr> <tr> <td>'s'</td> <td>Sortable date time.</td> </tr> <tr> <td>'t'</td> <td>Sort Time</td> </tr> <tr> <td>'T'</td> <td>Long Time</td> </tr> <tr> <td>'u'</td> <td>Universal sortable date time.</td> </tr> <tr> <td>'U'</td> <td>Universal full date-time.</td> </tr> <tr> <td>'Y','y'</td> <td>Year, Month</td> </tr> </table> <p> <strong>We will specify the format of the DateTime in the below C# Code. </strong> </p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime FormatOfDate = new DateTime(2020, 02, 25); // DateTime Formats: d, D, f, F, g, G, m, o, r, s, t, T, u, U, Console.WriteLine('----------------'); Console.WriteLine('d Formats'); Console.WriteLine('----------------'); string[] DateFormat = FormatOfDate.GetDateTimeFormats('d'); foreach (string format in DateFormat) Console.WriteLine(format); Console.WriteLine('----------------'); Console.WriteLine('D Formats'); Console.WriteLine('----------------'); DateFormat = FormatOfDate.GetDateTimeFormats('D'); foreach (string format in DateFormat) Console.WriteLine(format); Console.WriteLine('----------------'); Console.WriteLine('f Formats'); Console.WriteLine('----------------'); DateFormat = FormatOfDate.GetDateTimeFormats('f'); foreach (string format in DateFormat) Console.WriteLine(format); Console.WriteLine('----------------'); Console.WriteLine('F Formats'); Console.WriteLine('----------------'); DateFormat = FormatOfDate.GetDateTimeFormats('F'); foreach (string format in DateFormat) Console.WriteLine(format); } } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-6.webp" alt="DateTime in C#"> <br> <img src="//techcodeview.com/img/net-framework/10/datetime-c-7.webp" alt="DateTime in C#"> <p>We can also do the formatting of the DateTime by passing the format specifier in the ToString() method of DateTime. Now we will write the C# code for the formatting of the DateTime using the ToString() method.</p> <pre> Console.WriteLine(DateOfFormat.ToString('r')); </pre> <p>Now we will write a C# code for the DateTime format specifiers within the ToString() method.</p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-8.webp" alt="DateTime in C#"> <h2>Get the Leap Year and Daylight-Saving Time</h2> <p>Through the C# Code, we will get the Leap Year and Daylight-Saving Time.</p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DateOfTime = new DateTime(2020, 02, 22); Console.WriteLine(DateOfTime.IsDaylightSavingTime()); Console.WriteLine(DateTime.IsLeapYear(DateOfTime.Year)); } } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-9.webp" alt="DateTime in C#"> <h2>Conversion of string to the DateTime</h2> <p>To convert the string to a DateTime object, we used the Parse method. In the Parse method, the passing string must have the correct format of the DateTime. For the conversion of the DateTime to the String, the ToString() method is used. </p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { string DT = '2020-02-04T20:12:45-5:00'; DateTime NEWDt = DateTime.Parse(DT); Console.WriteLine(NEWDt.ToString()); } } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-10.webp" alt="DateTime in C#"> <h2>Conversion of DateTime in C#</h2> <p>The structure of the DateTime is full of self-explanatory conversion, which converts the DateTime to the specific type. The methods are ToFileTime, ToLocalTime, ToLongDateString, ToBinary ,ToLongTimeString, ToOADate, ToShortDateString, ToShortTimeString, ToString, and ToUniversalTime.</p> <p>Here we will take an example of C# to convert the DateTime to the specific type.</p> <pre> using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DOB = new DateTime(2020, 01, 22); Console.WriteLine('ToString: ' + DOB.ToString()); Console.WriteLine('ToBinary: ' + DOB.ToBinary()); Console.WriteLine('ToFileTime: ' + DOB.ToFileTime()); Console.WriteLine('ToLocalTime: ' + DOB.ToLocalTime()); Console.WriteLine('ToLongDateString: ' + DOB.ToLongDateString()); Console.WriteLine('ToLongTimeString: ' + DOB.ToLongTimeString()); Console.WriteLine('ToOADate: ' + DOB.ToOADate()); Console.WriteLine('ToShortDateString: ' + DOB.ToShortDateString()); Console.WriteLine('ToShortTimeString: ' + DOB.ToShortTimeString()); Console.WriteLine('ToUniversalTime: ' + DOB.ToUniversalTime()); } } } </pre> <p> <strong>Output:</strong> </p> <img src="//techcodeview.com/img/net-framework/10/datetime-c-11.webp" alt="DateTime in C#"> <hr></0)></pre></0)></pre></=> Izhod:
Lahko preobremenimo GetDateTimeFormats metoda, ki prevzame specifikator oblike kot parameter in pretvori datum in čas v to obliko. Da bi dobili želeno obliko, moramo razumeti obliko Datum čas specifikatorji.
Prikazali ga bomo s kodo z vzorcem v tabeli.
| Koda | Vzorec |
|---|---|
| 'd' | Kratek zmenek |
| 'D' | Dolg zmenek |
| 'f' | Polni datumski čas. Kratek čas. |
| 'F' | Polni datumski čas. Dolgo časa. |
| 'g' | Ustvarite datum in čas. Dolgo časa. |
| 'G' | Splošni datum in čas. Dolgo časa. |
| 'M','m.' | Mesec/dan |
| 'o', 'o' | Datum/ura povratnega potovanja. |
| 'R','r' | RFC1123 |
| 's' | Razvrstljiv datum čas. |
| 't' | Razvrsti čas |
| 'T' | Dolgo časa |
| 'noter' | Univerzalni razvrstljivi datum in čas. |
| 'V' | Univerzalni polni datum-čas. |
| 'In','in' | Leto, Mesec |
Format datuma in časa bomo določili v spodnji kodi C#.
using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime FormatOfDate = new DateTime(2020, 02, 25); // DateTime Formats: d, D, f, F, g, G, m, o, r, s, t, T, u, U, Console.WriteLine('----------------'); Console.WriteLine('d Formats'); Console.WriteLine('----------------'); string[] DateFormat = FormatOfDate.GetDateTimeFormats('d'); foreach (string format in DateFormat) Console.WriteLine(format); Console.WriteLine('----------------'); Console.WriteLine('D Formats'); Console.WriteLine('----------------'); DateFormat = FormatOfDate.GetDateTimeFormats('D'); foreach (string format in DateFormat) Console.WriteLine(format); Console.WriteLine('----------------'); Console.WriteLine('f Formats'); Console.WriteLine('----------------'); DateFormat = FormatOfDate.GetDateTimeFormats('f'); foreach (string format in DateFormat) Console.WriteLine(format); Console.WriteLine('----------------'); Console.WriteLine('F Formats'); Console.WriteLine('----------------'); DateFormat = FormatOfDate.GetDateTimeFormats('F'); foreach (string format in DateFormat) Console.WriteLine(format); } } } Izhod:
poravnava img css
Oblikovanje DateTime lahko izvedemo tudi tako, da posredujemo specifikator formata v metodi ToString() DateTime. Zdaj bomo napisali kodo C# za oblikovanje DateTime z uporabo metode ToString().
Console.WriteLine(DateOfFormat.ToString('r'));
Zdaj bomo napisali kodo C# za specifikatorje formata DateTime znotraj metode ToString().
Pridobite prestopno leto in poletni čas
Preko kode C# bomo dobili prestopno leto in poletni čas.
using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DateOfTime = new DateTime(2020, 02, 22); Console.WriteLine(DateOfTime.IsDaylightSavingTime()); Console.WriteLine(DateTime.IsLeapYear(DateOfTime.Year)); } } } Izhod:
Pretvorba niza v datum in čas
Za pretvorbo niza v objekt DateTime smo uporabili metodo Parse. V metodi Parse mora imeti prehodni niz pravilno obliko datuma in časa. Za pretvorbo DateTime v String se uporablja metoda ToString().
using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { string DT = '2020-02-04T20:12:45-5:00'; DateTime NEWDt = DateTime.Parse(DT); Console.WriteLine(NEWDt.ToString()); } } } Izhod:
Pretvorba DateTime v C#
Struktura DateTime je polna samoumevne pretvorbe, ki pretvori DateTime v določen tip. Metode so ToFileTime, ToLocalTime, ToLongDateString, ToBinary, ToLongTimeString, ToOADate, ToShortDateString, ToShortTimeString, ToString in ToUniversalTime.
Tukaj bomo vzeli primer C# za pretvorbo DateTime v določeno vrsto.
using System; using System. Collections; using System.Collections.Generic; using System. Linq; using System. Text; using System.Threading.Tasks; namespace ConsoleApp8 { class Program { static void Main(string[] args) { DateTime DOB = new DateTime(2020, 01, 22); Console.WriteLine('ToString: ' + DOB.ToString()); Console.WriteLine('ToBinary: ' + DOB.ToBinary()); Console.WriteLine('ToFileTime: ' + DOB.ToFileTime()); Console.WriteLine('ToLocalTime: ' + DOB.ToLocalTime()); Console.WriteLine('ToLongDateString: ' + DOB.ToLongDateString()); Console.WriteLine('ToLongTimeString: ' + DOB.ToLongTimeString()); Console.WriteLine('ToOADate: ' + DOB.ToOADate()); Console.WriteLine('ToShortDateString: ' + DOB.ToShortDateString()); Console.WriteLine('ToShortTimeString: ' + DOB.ToShortTimeString()); Console.WriteLine('ToUniversalTime: ' + DOB.ToUniversalTime()); } } } Izhod:
