Java Week Day getWeek(Date today, int index, String format)

Description

get Week

License

Apache License

Declaration

public static String getWeek(Date today, int index, String format) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;

public class Main {
    /**/*ww  w  . j  a  v  a  2 s . c  o  m*/
     * The constant FORMAT.
     */
    public static final String FORMAT = "yyyy-MM-dd HH:mm:ss";
    /**
     * The constant SDF_FORMAT.
     */
    public static final SimpleDateFormat SDF_FORMAT = new SimpleDateFormat(FORMAT);

    public static String getWeek(Date today, int index, String format) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(today);
        ArrayList<Date> list = getWeekDateList(today, 0);
        Date d = calendar.getTime();
        for (Date date : list) {
            Calendar c = Calendar.getInstance();
            c.setTime(date);
            if (c.get(Calendar.DAY_OF_WEEK) == index + 1) {
                d = c.getTime();
            }
        }

        return getDateTime(d, format);
    }

    /**
     * Gets week date list.
     *
     * @param today the today
     * @param index the index
     * @return ArrayList<Date> week date list
     * @throws
     * @Title: getWeekDateList
     * @Description:
     */
    public static ArrayList<Date> getWeekDateList(Date today, int index) {
        ArrayList<Date> list = new ArrayList<Date>();
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(today);
        if (calendar.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY) {
            calendar.add(Calendar.WEEK_OF_YEAR, -1);
        }
        calendar.add(Calendar.WEEK_OF_YEAR, index);
        calendar.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        for (int i = 0; i <= 6; i++) {
            Calendar c = Calendar.getInstance();
            c.setTime(calendar.getTime());
            c.add(Calendar.DAY_OF_MONTH, i);
            Date d = c.getTime();
            list.add(d);
        }
        if (list.size() == 0) {
            list.add(today);
        }
        return list;
    }

    /**
     * Gets date time.
     *
     * @param @return
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime() {
        return SDF_FORMAT.format(new Date());
    }

    /**
     * Gets date time.
     *
     * @param format the format
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime(String format) {
        // Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        // return sdf.format(calendar.getTime());
        return sdf.format(new Date());
    }

    /**
     * Gets date time.
     *
     * @param date   the date
     * @param format the format
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime(Date date, String format) {
        // Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        // return sdf.format(calendar.getTime());
        return sdf.format(date);
    }

    /**
     * Gets date time.
     *
     * @param date the date
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime(Date date) {
        // Calendar calendar = Calendar.getInstance();
        SimpleDateFormat sdf = new SimpleDateFormat(FORMAT);
        // return sdf.format(calendar.getTime());
        return SDF_FORMAT.format(date);
    }

    /**
     * Gets date time.
     *
     * @param today  the today
     * @param index  the index
     * @param format the format
     * @return the date time
     */
    public static String getDateTime(Date today, int index, String format) {
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(today);
        calendar.add(Calendar.DAY_OF_MONTH, index);
        Date d = calendar.getTime();
        return getDateTime(d, format);
    }

    /**
     * Gets date time.
     *
     * @param currentTimeMillis the current time millis
     * @param format            the format
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime(long currentTimeMillis, String format) {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date(currentTimeMillis));
    }

    /**
     * Gets date time.
     *
     * @param currentTimeMillis the current time millis
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime(long currentTimeMillis) {
        SimpleDateFormat sdf = new SimpleDateFormat(FORMAT);
        return sdf.format(new Date(currentTimeMillis));
    }

    /**
     * Gets date time.
     *
     * @param currentTimeMillis the current time millis
     * @param ms                the ms
     * @return String date time
     * @throws
     * @Title: getDateTime
     * @Description:
     */
    public static String getDateTime(long currentTimeMillis, boolean ms) {
        String format = ms ? "yyyy-MM-dd HH:mm:ss.SSS" : FORMAT;
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(new Date(currentTimeMillis));
    }

    /**
     * Format string.
     *
     * @param format the format
     * @param date   the date
     * @return the string
     * @throws ParseException the parse exception
     */
    public static String format(String format, Date date) throws ParseException {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        return sdf.format(date);
    }

    /**
     * Format string.
     *
     * @param date the date
     * @return the string
     * @throws ParseException the parse exception
     */
    public static String format(Date date) throws ParseException {
        return SDF_FORMAT.format(date);
    }
}

Related

1. getShortWeekday(String day)
2. getSQLForWeekSunday(String weekString)
3. getSundayOfWeek()
4. getThisWeekMonday()
5. getTodayOfWeek()
6. getWeekBeginDay(String date)
7. getWeekDay()
8. GetWeekDay()
9. getWeekDay()