Java Date Start getStartDate(String date)

Description

get Start Date

License

Open Source License

Declaration

public static String getStartDate(String date) 

Method Source Code

//package com.java2s;
import java.util.Calendar;

public class Main {
    public static String getStartDate(String date) {
        String startDate;/*from w w  w  . j  a v a 2s  .  c  o m*/

        int year = getYear(date);
        int month = getMonth(date);
        int day = getDate(date);

        int curDayOfWeek = getDayOfWeek(year, month, day);

        int startTmp = 1 - curDayOfWeek;

        Calendar tmpCalendar = Calendar.getInstance();

        tmpCalendar.set(year, month - 1, day);
        tmpCalendar.add(Calendar.DATE, startTmp);

        startDate = Integer.toString(tmpCalendar.get(Calendar.YEAR));

        if ((tmpCalendar.get(Calendar.MONTH) + 1) < 10)
            startDate += "0";

        startDate += Integer.toString((tmpCalendar.get(Calendar.MONTH)) + 1);

        if (tmpCalendar.get(Calendar.DATE) < 10)
            startDate += "0";

        startDate += Integer.toString(tmpCalendar.get(Calendar.DATE));

        return startDate;

    }

    public static int getYear(String date) {
        return Integer.parseInt(date.substring(0, 4));
    }

    public static int getMonth(String date) {
        return Integer.parseInt(date.substring(4, 6));
    }

    public static int getDate(String date) {
        return Integer.parseInt(date.substring(6, 8));
    }

    public static int getDayOfWeek(int _year, int _month, int _day) {
        int year, month, date;

        Calendar cal = Calendar.getInstance();
        cal.set(_year, _month - 1, _day);

        return cal.get(Calendar.DAY_OF_WEEK);
    }
}

Related

1. getStart(Date date)
2. getStartDate(Date date)
3. getStartDate(Date date)
4. getStartDate(Date date)
5. getStartDateOfCurrentSemester()
6. getStartDateOfCurrMonth()
7. getStartDay(Date date)
8. getStartDayOfNextMonth(Date date)