Java Date Now getCurrentWeekDay(Date date, int day)

Description

get Current Week Day

License

Open Source License

Declaration

public static String getCurrentWeekDay(Date date, int day) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.text.SimpleDateFormat;

import java.util.Calendar;
import java.util.Date;

public class Main {
    /**/*from ww w. j a v  a2  s .  com*/
     * default date format pattern
     */
    public final static String DATE_FORMAT = "yyyy-MM-dd";
    private static final int DAYS_OF_A_WEEK = 7;

    public static String getCurrentWeekDay(Date date, int day) {
        Calendar calendar = getCalendarFromDate(date);
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        calendar.setMinimalDaysInFirstWeek(DAYS_OF_A_WEEK);
        int week = calendar.get(Calendar.WEEK_OF_YEAR);
        int year = calendar.get(Calendar.YEAR);

        return formatDate(getDateOfYearWeek(year, week, day));
    }

    /**
     * get calendar from date
     *
     * @param date the passing date
     * @return the calendar instance
     */
    public static Calendar getCalendarFromDate(Date date) {
        Calendar calendar = getDefaultCalendar();
        calendar.setTime(date);
        return calendar;
    }

    /**
     * format date with the default pattern
     *
     * @param date the date that want to format to string
     * @return the formated date
     */
    public static String formatDate(Date date) {
        SimpleDateFormat format = new SimpleDateFormat(DATE_FORMAT);
        return format.format(date);
    }

    /**
     * format date with the given pattern
     *
     * @param date the date that want to format to string
     * @param pattern the formated pattern
     * @return the formated date
     */
    public static String formatDate(Date date, String pattern) {
        if (date == null) {
            return null;
        }
        SimpleDateFormat format = new SimpleDateFormat(pattern);
        return format.format(date);
    }

    private static Date getDateOfYearWeek(int yearNum, int weekNum, int dayOfWeek) {
        Calendar cal = Calendar.getInstance();
        cal.setFirstDayOfWeek(Calendar.MONDAY);
        cal.set(Calendar.DAY_OF_WEEK, dayOfWeek);
        cal.setMinimalDaysInFirstWeek(DAYS_OF_A_WEEK);
        cal.set(Calendar.YEAR, yearNum);
        cal.set(Calendar.WEEK_OF_YEAR, weekNum);
        /*cal.set(Calendar.HOUR_OF_DAY, 0);
        cal.set(Calendar.MINUTE, 0);
        cal.set(Calendar.SECOND, 0);*/
        return cal.getTime();
    }

    /**
     * get the default calendar
     *
     * @return the calendar instance
     */
    public static Calendar getDefaultCalendar() {
        Calendar calendar = Calendar.getInstance();
        calendar.setFirstDayOfWeek(Calendar.MONDAY);
        return calendar;
    }
}

Related

1. getCurrentUtcDate()
2. getCurrentUTCSeconds(Date current)
3. getCurrentUTCString()
4. getCurrentUTCTime()
5. getCurrentUTCTimeAsString()
6. getCurrentWeekDays()
7. getCurrentWeekFirst()
8. getCurrentYear()
9. getCurrentYearBegDate(Date date)