в 15:31, 26 мая 2010

2010-05-26T15:31:53Z

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2010-05-26T12:20:00Z

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==Add seconds to current time==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
public class MainClass{
public static void Main(){
DateTime endTime = DateTime.Now.AddSeconds(123);
while (DateTime.Now < endTime)
{
Console.WriteLine(DateTime.Now.TimeOfDay.ToString());
}
}
}</source>
<pre class=codeResult>14:25:59.9687500
14:25:59.9687500
14:25:59.9687500
14:25:59.9687500
14:25:59.9687500
14:25:59.9687500
14:25:59.9687500
^CTerminate batch job (Y/N)? n</pre>

==Benchmark Timing with DateTime==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Text;
public class MyMath
{
public int DoSum( int n )
{
int result = 0;
for ( int i = 1; i <= n; i++ )
{
result += i;
}
return result;
}
public int DoSum2()
{
return 1 + 20;
}
}
public class TestDriver
{
public static void Main()
{
int val = 20;
int iterations = 1000000;
int result = 0;
MyMath m = new MyMath();
DateTime startTime = DateTime.Now;
for ( int i = 0; i < iterations; i++ )
{
result = m.DoSum( val );
}
TimeSpan elapsed =DateTime.Now - startTime;
Console.WriteLine("Loop: Sum of ({0}) = {1}",val, result );
Console.WriteLine(elapsed.TotalMilliseconds.ToString() );
startTime = DateTime.Now;
for ( int i = 0; i < iterations; i++ )
{
result = m.DoSum2();
}
elapsed = DateTime.Now - startTime;
Console.WriteLine("Brute Force: Sum of ({0}) = {1}",val, result );
Console.WriteLine(elapsed.TotalMilliseconds );
}
}</source>

==Create a DateTime instance, specifying the number of ticks==

<source lang="csharp">using System;
class MainClass {
public static void DisplayDateTime(string name, DateTime myDateTime) {
Console.WriteLine(name + " = " + myDateTime);
Console.WriteLine(name + ".Year = " + myDateTime.Year);
Console.WriteLine(name + ".Month = " + myDateTime.Month);
Console.WriteLine(name + ".Day = " + myDateTime.Day);
Console.WriteLine(name + ".Hour = " + myDateTime.Hour);
Console.WriteLine(name + ".Minute = " + myDateTime.Minute);
Console.WriteLine(name + ".Second = " + myDateTime.Second);
Console.WriteLine(name + ".Millisecond = " + myDateTime.Millisecond);
Console.WriteLine(name + ".Ticks = " + myDateTime.Ticks);
}
public static void Main()
{

DateTime myDateTime4 = new DateTime(0);
DisplayDateTime("myDateTime4", myDateTime4);
}
}</source>
<pre class=codeResult>myDateTime4 = 01/01/0001 12:00:00 AM
myDateTime4.Year = 1
myDateTime4.Month = 1
myDateTime4.Day = 1
myDateTime4.Hour = 0
myDateTime4.Minute = 0
myDateTime4.Second = 0
myDateTime4.Millisecond = 0
myDateTime4.Ticks = 0</pre>

==Create a DateTime instance, specifying the year, month, and day==

<source lang="csharp">using System;
class MainClass {
public static void DisplayDateTime(string name, DateTime myDateTime) {
Console.WriteLine(name + " = " + myDateTime);
Console.WriteLine(name + ".Year = " + myDateTime.Year);
Console.WriteLine(name + ".Month = " + myDateTime.Month);
Console.WriteLine(name + ".Day = " + myDateTime.Day);
Console.WriteLine(name + ".Hour = " + myDateTime.Hour);
Console.WriteLine(name + ".Minute = " + myDateTime.Minute);
Console.WriteLine(name + ".Second = " + myDateTime.Second);
Console.WriteLine(name + ".Millisecond = " + myDateTime.Millisecond);
Console.WriteLine(name + ".Ticks = " + myDateTime.Ticks);
}
public static void Main()
{

int year = 2002;
int month = 12;
int day = 25;
DateTime myDateTime = new DateTime(year, month, day);
DisplayDateTime("myDateTime", myDateTime);
}
}</source>
<pre class=codeResult>myDateTime = 25/12/2002 12:00:00 AM
myDateTime.Year = 2002
myDateTime.Month = 12
myDateTime.Day = 25
myDateTime.Hour = 0
myDateTime.Minute = 0
myDateTime.Second = 0
myDateTime.Millisecond = 0
myDateTime.Ticks = 631763712000000000</pre>

==Create a DateTime instance, specifying the year, month, day, and JulianCalendar object==

<source lang="csharp">using System;
class MainClass {
public static void DisplayDateTime(string name, DateTime myDateTime) {
Console.WriteLine(name + " = " + myDateTime);
Console.WriteLine(name + ".Year = " + myDateTime.Year);
Console.WriteLine(name + ".Month = " + myDateTime.Month);
Console.WriteLine(name + ".Day = " + myDateTime.Day);
Console.WriteLine(name + ".Hour = " + myDateTime.Hour);
Console.WriteLine(name + ".Minute = " + myDateTime.Minute);
Console.WriteLine(name + ".Second = " + myDateTime.Second);
Console.WriteLine(name + ".Millisecond = " + myDateTime.Millisecond);
Console.WriteLine(name + ".Ticks = " + myDateTime.Ticks);
}
public static void Main()
{
int year = 2002;
int month = 12;
int day = 25;
int hour = 23;
int minute = 30;
int second = 12;
int millisecond = 5;
DateTime myDateTime = new DateTime(year, month, day, hour, minute, second, millisecond);
DisplayDateTime("myDateTime", myDateTime);

System.Globalization.JulianCalendar myCalendar = new System.Globalization.JulianCalendar();
DateTime myDateTime3 = new DateTime(year, month, day, myCalendar);
DisplayDateTime("myDateTime3", myDateTime3);
}
}</source>
<pre class=codeResult>myDateTime = 25/12/2002 11:30:12 PM
myDateTime.Year = 2002
myDateTime.Month = 12
myDateTime.Day = 25
myDateTime.Hour = 23
myDateTime.Minute = 30
myDateTime.Second = 12
myDateTime.Millisecond = 5
myDateTime.Ticks = 631764558120050000
myDateTime3 = 07/01/2003 12:00:00 AM
myDateTime3.Year = 2003
myDateTime3.Month = 1
myDateTime3.Day = 7
myDateTime3.Hour = 0
myDateTime3.Minute = 0
myDateTime3.Second = 0
myDateTime3.Millisecond = 0
myDateTime3.Ticks = 631774944000000000</pre>

==Create a DateTime instance, specifying the year, month, day, hour, minute, second, and millisecond==

<source lang="csharp">using System;
class MainClass {
public static void DisplayDateTime(string name, DateTime myDateTime) {
Console.WriteLine(name + " = " + myDateTime);
Console.WriteLine(name + ".Year = " + myDateTime.Year);
Console.WriteLine(name + ".Month = " + myDateTime.Month);
Console.WriteLine(name + ".Day = " + myDateTime.Day);
Console.WriteLine(name + ".Hour = " + myDateTime.Hour);
Console.WriteLine(name + ".Minute = " + myDateTime.Minute);
Console.WriteLine(name + ".Second = " + myDateTime.Second);
Console.WriteLine(name + ".Millisecond = " + myDateTime.Millisecond);
Console.WriteLine(name + ".Ticks = " + myDateTime.Ticks);
}
public static void Main()
{
int hour = 23;
int minute = 30;
int second = 12;
int millisecond = 5;
int year = 2004;
int month = 5;
int day = 12;
DateTime myDateTime = new DateTime(year, month, day, hour, minute, second, millisecond);
DisplayDateTime("myDateTime", myDateTime);
}
}</source>
<pre class=codeResult>myDateTime = 12/05/2004 11:30:12 PM
myDateTime.Year = 2004
myDateTime.Month = 5
myDateTime.Day = 12
myDateTime.Hour = 23
myDateTime.Minute = 30
myDateTime.Second = 12
myDateTime.Millisecond = 5
myDateTime.Ticks = 632200014120050000</pre>

==Create a DateTime with the current date and time==

<source lang="csharp">using System;
class MainClass
{
public static void Main(string[] args)
{
DateTime now = DateTime.Now;
Console.WriteLine("Now : {0}", now);
}
}</source>
<pre class=codeResult>Now : 25/03/2007 2:10:52 PM</pre>

==Create a TimeSpan instance, and add it to DateTime==

<source lang="csharp">using System;
class MainClass {
public static void DisplayDateTime(string name, DateTime myDateTime) {
Console.WriteLine(name + " = " + myDateTime);
Console.WriteLine(name + ".Year = " + myDateTime.Year);
Console.WriteLine(name + ".Month = " + myDateTime.Month);
Console.WriteLine(name + ".Day = " + myDateTime.Day);
Console.WriteLine(name + ".Hour = " + myDateTime.Hour);
Console.WriteLine(name + ".Minute = " + myDateTime.Minute);
Console.WriteLine(name + ".Second = " + myDateTime.Second);
Console.WriteLine(name + ".Millisecond = " + myDateTime.Millisecond);
Console.WriteLine(name + ".Ticks = " + myDateTime.Ticks);
}
public static void Main()
{

DateTime myDateTime4 = new DateTime(0);
TimeSpan myTimeSpan = new TimeSpan(4, 12, 10);
myDateTime4 += myTimeSpan;
DisplayDateTime("myDateTime4", myDateTime4);

}
}</source>
<pre class=codeResult>myDateTime4 = 01/01/0001 4:12:10 AM
myDateTime4.Year = 1
myDateTime4.Month = 1
myDateTime4.Day = 1
myDateTime4.Hour = 4
myDateTime4.Minute = 12
myDateTime4.Second = 10
myDateTime4.Millisecond = 0
myDateTime4.Ticks = 151300000000</pre>

==Create a TimeSpan representing 1 week and subtract from a DataTime==

<source lang="csharp">using System;
class MainClass
{
public static void Main(string[] args)
{
TimeSpan oneWeek = new TimeSpan(4, 12, 0, 0) + new TimeSpan(2, 12, 0, 0);

DateTime now = DateTime.Now;
// Create a DateTime representing 1 week ago.
DateTime past = now - oneWeek;

Console.WriteLine("Past : {0}", past);

}
}</source>
<pre class=codeResult>Past : 18/03/2007 2:10:53 PM</pre>

==Creating specific date/times: year, month, day, hour, minute, second==

<source lang="csharp">using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Text;
using System.Security.Cryptography;
public class MainClass
{
public static void Main()
{
DateTime dt1 = new DateTime(2004, 10, 19);
Console.WriteLine("dt1: {0}", dt1);
DateTime dt2 = new DateTime(2004, 10, 19, 22, 47, 35);
Console.WriteLine("dt2: {0}", dt2);
DateTime dt3 = new DateTime(2004, 10, 19, 22, 47, 35, 259);
Console.WriteLine("dt3: {0}", dt3);
}
}</source>
<pre class=codeResult>dt1: 19/10/2004 12:00:00 AM
dt2: 19/10/2004 10:47:35 PM
dt3: 19/10/2004 10:47:35 PM</pre>

==Display the Date, Day, DayOfWeek, DayOfYear, Ticks, and TimeOfDayProperties of DateTime==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{

DateTime myDateTime = DateTime.Now;
Console.WriteLine("myDateTime.Date = " + myDateTime.Date);
Console.WriteLine("myDateTime.Day = " + myDateTime.Day);
Console.WriteLine("myDateTime.DayOfWeek = " + myDateTime.DayOfWeek);
Console.WriteLine("myDateTime.DayOfYear = " + myDateTime.DayOfYear);
Console.WriteLine("myDateTime.Ticks = " + myDateTime.Ticks);
Console.WriteLine("myDateTime.TimeOfDay = " + myDateTime.TimeOfDay);

}
}</source>
<pre class=codeResult>myDateTime.Date = 25/03/2007 12:00:00 AM
myDateTime.Day = 25
myDateTime.DayOfWeek = Sunday
myDateTime.DayOfYear = 84
myDateTime.Ticks = 633104295802812500
myDateTime.TimeOfDay = 14:26:20.2812500</pre>

==Use the AddYears(), AddMonths(), AddDays(), AddMinutes(), and AddSeconds() methods to add periods to a DateTime==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
DateTime myDateTime9 = new DateTime(2004, 1, 1);
Console.WriteLine("Initial myDateTime9 = " + myDateTime9);
myDateTime9 = myDateTime9.AddYears(1);
myDateTime9 = myDateTime9.AddMonths(5);
myDateTime9 = myDateTime9.AddDays(3);
myDateTime9 = myDateTime9.AddMinutes(30);
myDateTime9 = myDateTime9.AddSeconds(15);
Console.WriteLine("Final myDateTime9 = " + myDateTime9);
}
}</source>
<pre class=codeResult>Initial myDateTime9 = 01/01/2004 12:00:00 AM
Final myDateTime9 = 04/06/2005 12:30:15 AM</pre>

==Use the Compare() method to compare DateTime instances==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
DateTime myDateTime3 = new DateTime(2004, 1, 13);
DateTime myDateTime4 = new DateTime(2004, 1, 14);
Console.WriteLine("myDateTime3 = " + myDateTime3);
Console.WriteLine("myDateTime4 = " + myDateTime4);
int intResult = DateTime.rupare(myDateTime3, myDateTime4);
Console.WriteLine("DateTime.rupare(myDateTime3, myDateTime4) = " + DateTime.rupare(myDateTime3, myDateTime4));
}
}</source>
<pre class=codeResult>myDateTime3 = 13/01/2004 12:00:00 AM
myDateTime4 = 14/01/2004 12:00:00 AM
DateTime.rupare(myDateTime3, myDateTime4) = -1</pre>

==Use the DaysInMonth() method to retrieve the number of days in a particular month and year==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
int days = DateTime.DaysInMonth(2004, 1);
Console.WriteLine("DateTime.DaysInMonth(2004, 1) = " + days);
}
}</source>
<pre class=codeResult>DateTime.DaysInMonth(2004, 1) = 31</pre>

==Use the Equals() method to compare DateTime instances==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
DateTime myDateTime3 = new DateTime(2004, 1, 13);
DateTime myDateTime4 = new DateTime(2004, 1, 14);
Console.WriteLine("myDateTime3 = " + myDateTime3);
Console.WriteLine("myDateTime4 = " + myDateTime4);

bool boolResult = DateTime.Equals(myDateTime3, myDateTime4);
Console.WriteLine("DateTime.Equals(myDateTime3, myDateTime4) = " + boolResult);
boolResult = myDateTime3.Equals(myDateTime4);
Console.WriteLine("myDateTime3.Equals(myDateTime4) is " + boolResult);
}
}</source>
<pre class=codeResult>myDateTime3 = 13/01/2004 12:00:00 AM
myDateTime4 = 14/01/2004 12:00:00 AM
DateTime.Equals(myDateTime3, myDateTime4) = False
myDateTime3.Equals(myDateTime4) is False</pre>

==Use the FromFileTime() method to convertan operating system file timestamp to a DateTime==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
DateTime myDateTime10 = new DateTime(2004, 1, 15, 23, 2, 5);
long myFileTime = myDateTime10.ToFileTime();
DateTime myDateTime11 = DateTime.FromFileTime(myFileTime);
Console.WriteLine("DateTime.FromFileTime() = " + myDateTime11);
}
}</source>
<pre class=codeResult>DateTime.FromFileTime() = 15/01/2004 11:02:05 PM</pre>

==Use the IsLeapYear() method to determine if a particular year is a leap year==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
bool boolResult = DateTime.IsLeapYear(2004);
Console.WriteLine("DateTime.IsLeapYear(2004) = " + boolResult);
}
}</source>
<pre class=codeResult>DateTime.IsLeapYear(2004) = True</pre>

==Use the Now and UtcNow properties to get the currrent date and time==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{

Console.WriteLine("DateTime.Now = " + DateTime.Now);
Console.WriteLine("DateTime.UtcNow = " + DateTime.UtcNow);
DateTime myDateTime = DateTime.Now;
Console.WriteLine("myDateTime = " + myDateTime);
DateTime myDateTime2 = DateTime.UtcNow;
Console.WriteLine("myDateTime = " + myDateTime);
}
}</source>
<pre class=codeResult>DateTime.Now = 25/03/2007 2:26:19 PM
DateTime.UtcNow = 25/03/2007 9:26:19 PM
myDateTime = 25/03/2007 2:26:19 PM
myDateTime = 25/03/2007 2:26:19 PM</pre>

==Use the overloaded addition operator (+) to add a TimeSpan to a DateTime==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{

DateTime myDateTime = DateTime.Parse("1/11/2004 23:10:30");

TimeSpan myTimeSpan = new TimeSpan(1, 2, 4, 10);
DateTime myDateTime8 = myDateTime + myTimeSpan;
Console.WriteLine("myDateTime + myTimeSpan = " + myDateTime8);
}
}</source>
<pre class=codeResult>myDateTime + myTimeSpan = 03/11/2004 1:14:40 AM</pre>

==Use the overloaded less than operator (==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
DateTime myDateTime3 = new DateTime(2004, 1, 13);
DateTime myDateTime4 = new DateTime(2004, 1, 14);
Console.WriteLine("myDateTime3 = " + myDateTime3);
Console.WriteLine("myDateTime4 = " + myDateTime4);

bool boolResult = myDateTime3 < myDateTime4;
Console.WriteLine("myDateTime3 < myDateTime4 is " + boolResult);
}
}</source>
<pre class=codeResult>myDateTime3 = 13/01/2004 12:00:00 AM
myDateTime4 = 14/01/2004 12:00:00 AM
myDateTime3 < myDateTime4 is True</pre>

==Use the overloaded subtraction operator (-) to subtract a TimeSpan from a DateTime==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{

DateTime myDateTime = DateTime.Parse("1/11/2004 23:10:30");

TimeSpan myTimeSpan = new TimeSpan(1, 2, 4, 10);
DateTime myDateTime8 = myDateTime - myTimeSpan;
Console.WriteLine("myDateTime - myTimeSpan = " + myDateTime8);
}
}</source>
<pre class=codeResult>myDateTime - myTimeSpan = 31/10/2004 9:06:20 PM</pre>

==Use the ToFileTime() method to convert a DateTime to an operating system file timestamp==

<source lang="csharp">using System;
class MainClass
{
public static void Main()
{
DateTime myDateTime10 = new DateTime(2004, 1, 15, 23, 2, 5);
long myFileTime = myDateTime10.ToFileTime();
Console.WriteLine("myDateTime10.ToFileTime() = " + myDateTime10.ToFileTime());
}
}</source>
<pre class=codeResult>myDateTime10.ToFileTime() = 127187101250000000</pre>

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Csharp/CSharp Tutorial/Date Time/DateTime - История изменений

в 15:31, 26 мая 2010

Admin: 1 версия