A variety of ways Android acquires system time _android

There are several ways to get system time in Android, which can be divided into Java Calendar class acquisition, Java.util.date class implementation, and Android.

The summary is as follows:

Method One:

void GetTime1 () { 
    long time=system.currenttimemillis ();//long now = Android.os.SystemClock.uptimeMillis (); 
    SimpleDateFormat format=new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); 
    Date D1=new date (time); 
    String T1=format.format (d1); 
    LOG.E ("msg", T1); 
  } 

Method Two:

SimpleDateFormat format = new SimpleDateFormat ("Yyyy-mm-dd-hh:mm:ss"); 
    String T=format.format (New Date ()); 
    LOG.E ("msg", t); 

Method Three:

void GetTime3 () { 
  Calendar calendar = calendar.getinstance (); 
  String created = Calendar.get (calendar.year) + "Year" 
      + (Calendar.get (calendar.month) +1) + "Month"//from 0 calculation 
      + Calendar.get (Calendar.day_of_month) + "Day" 
      + calendar.get (calendar.hour_of_day) + "time" 
      + calendar.get ( Calendar.minute) + "min" +calendar.get (Calendar.second) + "s"; 
  LOG.E ("MSG", created); 
  } 

Method Four:

void GetTime4 () {Time 
    t=new time (),//or time T=new time ("Gmt+8"), plus time zone data. 
    T.settonow ();//Get the system time. 
    String time=t.year+ "year" + (t.month+1) + "month" +t.monthday+ "Day" +t.hour+ "H" +t.minute+ "M" +t.second; 
    LOG.E ("MSG", time); 
  } 

Get Sunday Period:

Calendar calendar = Calendar.getinstance (); 
      int day = Calendar.get (Calendar.day_of_week); 
      String today = null; 
      if (day = = 2) {Today 
        = ' Monday '; 
      } else if (day = = 3) {Today 
        = ' Tuesday '; 
      } else if (day = = 4) { 
        tod ay = "Wednesday"; 
      }  else if (day = = 5) {Today 
        = ' Thursday '; 
      } else if (day = = 6) {Today 
        = ' Friday '; 
      } else if (day = 7) {Today 
        = "Saturday"; 
      } else if (day = = 1) {Today 
        = "Sunday"; 
      } 
      System.out.println ("Today's is:-" + today); 

Finally, the date format, date format is usually implemented using the SimpleDateFormat class, where the date format can not be defined at their own discretion, mainly in the following several forms:

SimpleDateFormat f1= new SimpleDateFormat (); There are no formatting parameters, we use the default date format.
System.out.println (New Date ()) (f.formate);

The date format for the code output is:12-3-22 pm 4:36

SimpleDateFormat f4= New SimpleDateFormat ("Today is" + "yyyy mm month DD Day E KK-point mm);
" Different date formats can be displayed according to different style requests, and the E-parameter
System.out.println (F4.format (New Date ()) can be added to the week;
The date format for the code output is: Today is March 22, 2012 Thursday 16:46
SimpleDateFormat formater = new SimpleDateFormat ("YyyyMMdd hh:mm:ss");
System.out.println ("date to String" +formater.format (new Date ());
Similar common forms also include YyMMdd hh:mm:ss yyyy-mm-dd hh:mm:ss dd-mm-yyyy hh:mm:ss

It is usually necessary to convert a specific date to a millisecond or timestamp form, as follows:

Text-> Timestamp, Date-> Timestamp

 Timestamp T;
 SimpleDateFormat format = new SimpleDateFormat ("Yyyy-mm-dd hh:mm:ss");
 Try ... {
  T = new Timestamp (Format.parse ("2007-07-19 00:00:00"). GetTime ());
 catch (ParseException e) ... {
  e.printstacktrace ();
 }
 Timestamp T;
 SimpleDateFormat format = new SimpleDateFormat ("Yyyy-mm-dd hh:mm:ss");
 t = new Timestamp (new Date (). GetTime ());

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