날짜관련

참고자료

Link - http://www.yunsobi.com/blog/325

 

 

 

■ 날짜 설정

● Date

 

?

1 2 3 4 5

SimpleDateFormat startFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm"); //24시간은 HH Date day = startFormat.parse("2013-05-01 10:00");   System.out.println(day); //Mon Jul 01 10:00:00 KST 2013 System.out.println(startFormat.format(day)); //2013-07-01 10:00

 

 

● Calendar

 

?

1 2 3 4 5 6

Calendar cal = Calendar.getInstance(); //혹은 Calendar cal = new GregorianCalendar(); cal.set(2013, 01-1, 01, 10, 14); //월은 -1 주의   System.out.println(cal.getTime()); //Tue Jan 01 10:14:28 KST 2013 System.out.println(cal.getTime().getTime()); //1357002859406

 

 

 

 

■ 날짜 연산

● Date

 

?

1 2 3 4 5 6

SimpleDateFormat startFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm"); Date day = startFormat.parse("2013-07-01 10:00"); System.out.println(startFormat.format(day)); //2013-07-01 10:00   day.setTime(day.getTime() + (60*1000)*666); //666분 후 System.out.println(startFormat.format(day)); //2013-07-01 21:06

 

 

 

● Calendar

 

?

1 2 3 4 5 6 7 8 9

Calendar cal = Calendar.getInstance(); cal.set(2013, 01-1, 01, 10, 14); System.out.println(cal.getTime()); //Tue Jan 01 10:14:16 KST 2013   cal.add(cal.MINUTE, 99); //99분 후 //미련한 방법 → cal.set(2013, 01-1, 01, 10, (cal.get(cal.MINUTE)+99)); System.out.println(cal.getTime()); //Tue Jan 01 11:53:12 KST 2013   System.out.println(format.format(cal.getTime())); //2013-01-01 11:53

 

 

■ 요일 구하기 (일:1 월:2 화:3 수:4 목:5 금:6 토:7)

● switch

 

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14

Calendar cal = Calendar.getInstance();   int dow = cal.get(cal.DAY_OF_WEEK); switch (dow) { case 1: day += "(" + "일" + ")"; break; case 2: day += "(" + "월" + ")"; break; case 3: day += "(" + "화" + ")"; break; case 4: day += "(" + "목" + ")"; break; case 5: day += "(" + "목" + ")"; break; case 6: day += "(" + "금" + ")"; break; case 7: day += "(" + "토" + ")"; break; }   dayList.add(day);

 

 

● array

 

?

1 2 3 4 5 6 7 8 9 10 11

Calendar cal = Calendar.getInstance();   String[] dayOfWeek = {"토", "일", "월", "화", "수", "목", "금"}; String yo_il = dayOfWeek[cal.get(cal.DAY_OF_WEEK)];   System.out.println(yo_il); //목   cal.add(cal.DATE, 1); //하루 후 yo_il = dayOfWeek[cal.get(cal.DAY_OF_WEEK)];   System.out.println(yo_il); //금

 

 

● 오늘부터 1주일 사이의 요일 구하기

 

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

SimpleDateFormat format = new SimpleDateFormat("MM-dd"); Calendar cal = Calendar.getInstance(); List<String> dayList = new ArrayList<String>(); String day = ""; String yoil = "";   for(int i=0; i<7; i++) {     day = format.format(cal.getTime());           String[] dayOfWeek = {"일", "월", "화", "수", "목", "금", "토"};     yoil = dayOfWeek[cal.get(cal.DAY_OF_WEEK)-1];       day += "(" + yoil + ")";           dayList.add(day);     cal.add(cal.DATE, 1); }   System.out.println(dayList);      //[05-02(목), 05-03(금), 05-04(토), 05-05(일), 05-06(월), 05-07(화), 05-08(수)]