Java SQL Date getWeekNumber()

Description

Gets the week number.

License

Open Source License

Return

the week number

Declaration

public static int getWeekNumber() 

Method Source Code

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

import java.sql.Date;

import java.util.Calendar;

public class Main {
    /**/*w ww.  j  av  a 2s  .  c o  m*/
     * Gets the week number.
     * 
     * @return the week number
     */
    public static int getWeekNumber() {
        return (getLastSundayDate().get(Calendar.DAY_OF_YEAR) - getFirstSundayDateInYear(
                2009).get(Calendar.DAY_OF_YEAR)) / 7 + 1;
    }

    /**
     * Gets the last sunday date.
     * 
     * @return the last sunday date
     */
    public static Calendar getLastSundayDate() {
        Calendar cal = Calendar.getInstance();
        int daydiff = cal.get(Calendar.DAY_OF_WEEK) - Calendar.SUNDAY;
        cal.add(Calendar.DATE, daydiff * -1);
        return cal;
    }

    /**
     * Gets the last sunday date.
     * 
     * @param d the d
     * 
     * @return the last sunday date
     */
    public static Calendar getLastSundayDate(Date d) {
        Calendar cal = Calendar.getInstance();
        cal.setTime(d);
        int daydiff = cal.get(Calendar.DAY_OF_WEEK) - Calendar.SUNDAY;
        cal.add(Calendar.DATE, daydiff * -1);
        return cal;
    }

    /**
     * Gets the first sunday date in year.
     * 
     * @param year the year
     * 
     * @return the first sunday date in year
     */
    public static Calendar getFirstSundayDateInYear(int year) {
        Calendar cal = Calendar.getInstance();
        cal.set(Calendar.YEAR, year);
        cal.set(Calendar.DAY_OF_YEAR, 8);
        if (cal.get(Calendar.DAY_OF_WEEK) == Calendar.SUNDAY)
            cal.set(Calendar.DAY_OF_YEAR, 7);
        int daydiff = cal.get(Calendar.DAY_OF_WEEK) - Calendar.SUNDAY;
        cal.add(Calendar.DATE, daydiff * -1);
        return cal;
    }
}

Related

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2. getNow()
3. getNowHour()
4. getProtobufClass(Object value, Class protobufClass)
5. getTodayAndTomorrow()
6. getWeekOfMonth(String year, String month, String day)
7. getYearLater()
8. hexToBin(String sHexString)
9. isLastDayOfMonth(String theDataStr)