C # About Time processing

A. DateTime

In C #, the system provides a lot of functions about time processing, and we can get the system time through System.DateTime.Now. Of course, you can also use a DateTime class to create a time object. Here are a few examples of how to get the system time.

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); stringtime1= System.DateTime.Now.ToString ("Yyyy-mm-dd-hh-mm-ss"); Console.WriteLine (TIME1);

The result of the program running is the screenshot

System.DateTime.Now.ToString ("Yyyy-mm-dd-hh-mm-ss") means to get the system's current time and display it in the year-month-day-hour-minute-seconds format.

Then look at the next Tube time class: Timespan, the literal meaning should know its Chinese meaning time interval. First look at an example:

TimeSpan Oneweek = new TimeSpan (4, 12, 0, 0) + New TimeSpan (2, 12, 0, 0); The parameters in (4, 12, 0, 0) represent Days,hours,minutes,seconds. DateTime now = DateTime.Now; DateTime past = Now-oneweek; Console.WriteLine (Oneweek. ToString ()); Console.WriteLine (now. ToString ()); Console.WriteLine (past. ToString ());

When you output the results

. Add x seconds to the current time./minute/hour/day operation.

DateTime time1 = DateTime.Now; DateTime time2 = DateTime.Now.AddYears (10); DateTime Time3 = DateTime.Now.AddMonths (11); DateTime time4 = DateTime.Now.AddDays (7); DateTime time5 = DateTime.Now.AddHours (12); Console.WriteLine (time1. ToString ()); Console.WriteLine (time2. ToString ()); Console.WriteLine (Time3. ToString ()); Console.WriteLine (Time4. ToString ()); Console.WriteLine (Time5. ToString ());

The results of the program run are:

DateTime time2 = DateTime.Now.AddYears (10) means that the current time plus 10 years after the assignment to time2;

About local time and standard UTC time: UTC time, which is Greenwich Mean time.

DateTime local=datetime.now;//local time Console.WriteLine ("{0},{1},{2}", Local.) ToString (), Local. Kind.tostring (), TimeZone.CurrentTimeZone.StandardName); DateTime utctime=datetime.utcnow;//Coordinated Universal Time; Console.WriteLine ("{0},{1}", Utctime.) ToString (), Utctime. Kind.tostring ());

Two. Questions relating to the time format

The format of the time display can be 24 or 12 hours, and there are other ways.

DateTime local=datetime.now;//local time Console.WriteLine ("The Time is{0:hh:mm tt}", local); Console.WriteLine ("Date is {0:ddd MMM dd, yyyy}", local); Console.WriteLine ("{0:ddd MMM dd,yyyy}", local); Console.WriteLine ("{0:hh:mm:ss tt}", local); Console.WriteLine ("{0:m}", local);

TimeSpan in the process of time processing has a lot of role, such as the calculation of two time between the time between how long, or 1 months after today is the date.

The TimeSpan constructors are:

TimeSpan Oneweek = new TimeSpan (4, 0, 0) + new TimeSpan (2, 12, 0, 0);

Then Oneweek equals 7 days: 4.5 days plus 2.5 days.

TimeSpan TP = new TimeSpan (1,50,20,10);//dd hh mm SS

TimeSpan TP2 = new TimeSpan (1, m)/hh mm SS

TimeSpan TP3 = new TimeSpan (1,1,1,1,1);//dd hh mm SS MSMs

The parameters in (4, 12, 0, 0) represent Days,hours,minutes,seconds respectively.

At the same time, we can use TimeSpan static method to assign value to TimeSpan instance object

Take a look at the following example:

TimeSpan SPA1 = timespan.fromdays (10); TimeSpan SPA2 = timespan.fromhours (10); TimeSpan spa3 = timespan.fromminutes (44); TimeSpan spa4 = timespan.fromseconds (5); TimeSpan Spa5 = Timespan.frommilliseconds (55); TimeSpan SPA6 = timespan.fromticks (200);//Time scale Console.WriteLine (SPA1); Console.WriteLine (SPA2); Console.WriteLine (SPA3); Console.WriteLine (SPA4); Console.WriteLine (SPA5); Console.WriteLine (SPA6);

The output results are:

The next section describes the knowledge of array and ArrayList in C #.