Java Date and SimpleDateFormat

I've been working on some projects that involve time processing. Originally wrote a time conversion function, although can be used but too cumbersome and not standardized, so learned the next Java comes with the time processing class.

 Public classTimechg { Public Static intymd[][][]=New int[110] [13] [33];  Public Static intDay[][][] =New int[25] [61] [61];  Public Static int_ymd[][] =New int[110*13*33+1] [3];  Public Static int_day[][] =New int[25*61*61+1] [3];  Public Static intSave[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};  Public Final Static intOnedays = 24*60*60;  Public Static voidTimeinit () {intY=2000,m=1,d=1; intCnt=0; Ymd[y-2000][M][D] =CNT; _ymd[cnt][0]=y;_ymd[cnt][1]=m; _ymd[cnt][2]=D;  while(y<2100)        {            if((y%4==0&&y%100!=0) | | (y%400==0)) save[2]=29; ElseSave[2]=28; D++; CNT++; if(d>Save[m]) {m++; D=1; if(m>12) {y++; M=1; }} ymd[y-2000][M][D] =CNT; _ymd[cnt][0]=y;_ymd[cnt][1]=m; _ymd[cnt][2]=D; }                intH=0,s=0; M= 0;//hours, minutes, secondsCnt=0; Day[h][m][s]=CNT; _day[cnt][0]=h; _day[cnt][1]=m; _day[cnt][2]=s;  while(true) {CNT++; S++; if(s==60) {s=0; M++; if(m==60) {m=0; H++; if(h==24)                    {                         Break; }}} Day[h][m][s]=CNT; _day[cnt][0]=h; _day[cnt][1]=m; _day[cnt][2]=s; }            }    /*** Time is in the format YYYYMMDDHHMMSS *@paramTime *@return     */     Public Static intStrtoint (String time) {inty,m,d,h,m,s; Y= Integer.parseint (time.substring (0, 4) ); M= Integer.parseint (Time.substring (4, 6) ); D= Integer.parseint (time.substring (6, 8) ); H= Integer.parseint (time.substring (8, 10) ); M= Integer.parseint (Time.substring (10, 12) ); S= Integer.parseint (Time.substring (12, 14) ); returnymd[y-2000<0?0:y-2000][m][d]*onedays +Day[h][m][s]; }         Public StaticString IntToStr (intTime ) {StringBuffer Timestr=NewStringBuffer (""); intIntymd,intday; Intymd= time/onedays; Intday= Time%onedays; Timestr.append (String.Format ("%04d", _ymd[intymd][0])); Timestr.append (String.Format ("%02d", _ymd[intymd][1])); Timestr.append (String.Format ("%02d", _ymd[intymd][2])); Timestr.append (String.Format ("%02d", _day[intday][0])); Timestr.append (String.Format ("%02d", _day[intday][1])); Timestr.append (String.Format ("%02d", _day[intday][2])); returntimestr.tostring (); }            }

Junk Code

Example 1 format output current system time

Date date=new  date ();//gets current time SimpleDateFormat df=new simpledateformat ("Yyyy-mm-dd hh:mm: ss

Example 2 converting a string format time to a timestamp

SimpleDateFormat SimpleDateFormat =new simpledateformat ("Yyyy-mm-dd-hh-mm-ss");D ate Date=  Null; Try {    = simpledateformat.parse ("2010-06-25-00-00-00"catch  (ParseException e) {     // TODO auto-generated Catch block     e.printstacktrace ();} long time = date.gettime ();//Starting January 1, 1970 the exact millisecond, to get the second unit, need/1000system.out.println (time);

Example 3 gets the date within the date object of the month and day, etc.

        Date date=new  date ();         System.out.println (Date.tostring ());        System.out.println (Date.getyear ()+1900);        System.out.println (Date.getmonth ()+1);        System.out.println (Date.getdate ()); // Note that Date.getday () is obtained day of the week, 0-6 respectively from Sunday, Monday, ... , Saturday

Java Date and SimpleDateFormat