Java Week Day getWeekFirstDay(Date date)

Description

get Week First Day

License

Open Source License

Declaration

public static Date getWeekFirstDay(Date date) 

Method Source Code

//package com.java2s;

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

public class Main {

    public static Date getWeekFirstDay(Date date) {
        Calendar c = Calendar.getInstance();
        c.setTime(date);//from   w w w .ja v  a  2  s . com
        int year = c.get(Calendar.YEAR);
        int week = c.get(Calendar.WEEK_OF_YEAR);

        c.clear();
        c.set(Calendar.YEAR, year);
        c.set(Calendar.WEEK_OF_YEAR, week);
        c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
        c.setFirstDayOfWeek(Calendar.MONDAY);

        return c.getTime();
    }

    public static String getTime(Calendar c) {
        return getDate(c.getTime(), "HH:mm:ss");
    }

    public static String getDate() {
        return getDate(getCurDate(), "yyyy-MM-dd");
    }

    public static String getDate(Date date, String format) {

        String dtstr = "";
        if (date == null) {
            return dtstr;
        }

        if (format == null || "".equals(format.trim())) {
            format = "yyyy-MM-dd";
        }

        SimpleDateFormat sdf = new SimpleDateFormat(format);
        dtstr = sdf.format(date);
        return (dtstr == null ? "" : dtstr);

    }

    public static String getDate(Date date) {
        return getDate(date, "yyyy-MM-dd");
    }

    public static Date getDate(long time) {

        Calendar c = getCurCalendar();
        c.setTimeInMillis(time);

        return c.getTime();
    }

    public static Date getCurDate() {
        return getCurCalendar().getTime();
    }

    public static Calendar getCurCalendar() {
        return Calendar.getInstance();
    }
}

Related

1. getWeekDayNUM()
2. getWeekdayOfDateTime(String datetime)
3. getWeekdays(DateFormatSymbols symbols)
4. getWeekDayStr(int dayInWeek)
5. getWeekendDays(Locale locale)
6. isDayOfWeek(int day)
7. isDayOfWeek(String str, int dayOfWeek)
8. isFirseDayOfCurrentWeek(Date date)
9. isoDayOfWeek(int javaDayOfWeek)