Java Year Format getStartAndEndWeekOfMonth(int year, int month, int week, String format)

Description

get Start And End Week Of Month

License

Open Source License

Declaration

public static String[] getStartAndEndWeekOfMonth(int year, int month, int week, String format) 

Method Source Code

//package com.java2s;

import java.util.*;
import java.text.*;

public class Main {
    public static String[] getStartAndEndWeekOfMonth(int year, int month, int week, String format) {

        SimpleDateFormat formater = new SimpleDateFormat(format);

        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month);
        calendar.set(Calendar.DATE, 0);

        int lastWeek = calendar.get(Calendar.WEEK_OF_MONTH);
        if (week > lastWeek)
            return null;

        String lastDate = formater.format(calendar.getTime());

        String[] result = new String[2];
        calendar.set(Calendar.WEEK_OF_MONTH, week);
        calendar.set(Calendar.DAY_OF_WEEK, 1);
        if (week == 1)
            calendar.set(Calendar.DATE, 1);

        result[0] = formater.format(calendar.getTime());

        if (lastWeek == week) {
            result[1] = lastDate;//ww  w.j  a v a 2  s .  c o  m
        } else {
            calendar.set(Calendar.DAY_OF_WEEK, 7);
            result[1] = formater.format(calendar.getTime());
        }
        return result;
    }

    public static Date getTime(String hhmm) {
        if (hhmm != null && hhmm.length() == 4 && isDigit(hhmm)) {
            Calendar cal = Calendar.getInstance();
            cal.set(Calendar.HOUR_OF_DAY, Integer.parseInt(hhmm.substring(0, 2)));
            cal.set(Calendar.MINUTE, Integer.parseInt(hhmm.substring(2, 4)));

            return cal.getTime();
        }

        return null;
    }

    private static boolean isDigit(String digitStr) {
        if (digitStr != null) {
            for (int i = 0; i < digitStr.length(); i++)
                if (!Character.isDigit(digitStr.charAt(i)))
                    return false;
        }
        return true;
    }
}

Related

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2. getDDMMYYY_HHMM()
3. getDDMMYYYYDate(Date date)
4. getFirstDate(String yearMonthStr, String yearMonthFormat, String dateFormat)
5. getFormatToDateSimple(String yyyyMMdd)
6. getStringFormatMMYYWithoutHyphens(Date aDate)
7. getStringFormatYYYYMMddWithHyphens(Date aDate)
8. getTimeByYMD()
9. getYear(SimpleDateFormat df, String dateStr)