Java SQL Date Create getLastDay(java.util.Date dt)

Description

get Last Day

License

Open Source License

Declaration

public static int getLastDay(java.util.Date dt) 

Method Source Code

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

import java.text.SimpleDateFormat;

import java.util.Calendar;

public class Main {
    private final static int[] SOLAR_MONTH_ARRAY = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

    public static int getLastDay(String dt) {
        if (dt.length() < 6)
            throw new IllegalArgumentException("date type -- yyyyMM, yyyyMMdd, yyyyMMddHHmmss");
        int year = Integer.parseInt(dt.substring(0, 4));
        int month = Integer.parseInt(dt.substring(4, 6));
        if (isLeapYear(year))
            return (month == 2) ? 29 : SOLAR_MONTH_ARRAY[month - 1];
        else//from  w w  w . jav a2 s .co m
            return SOLAR_MONTH_ARRAY[month - 1];
    }

    public static int getLastDay(java.sql.Date dt) {
        return getLastDay(convertFormat(dt, "yyyyMM"));
    }

    public static int getLastDay(java.sql.Timestamp dt) {
        return getLastDay(convertFormat(dt, "yyyyMM"));
    }

    public static int getLastDay(java.util.Date dt) {
        return getLastDay(convertFormat(dt, "yyyyMM"));
    }

    public static boolean isLeapYear(int year) {
        return (year % 400 == 0 || year % 100 != 0 && year % 4 == 0);
    }

    public static String convertFormat(long dt, String formatter) {
        return convertFormat(toUtilDate(dt), formatter);
    }

    /**
    * conver date format
    * @param dt String (yyyyMMdd or yyyyMMddHHmmss)
    * @param formatter String (yyyyMMdd.....)
    * @return String conver date format
    */
    public static String convertFormat(String dt, String formatter) {
        if (dt == null) {
            //                        throw new IllegalArgumentException("dt can not be null");
            return "";
        }
        dt = dt.trim();

        int len = dt.length();
        if (!(len == 8 || len == 14)) {
            //                        throw new IllegalArgumentException("dt length must be 8 or 14 (yyyyMMdd or yyyyMMddHHmmss)");
            return dt;
        }

        if (dt.length() == 8)
            dt += "000000";

        SimpleDateFormat sdf = new SimpleDateFormat(formatter);
        return sdf.format(getDate(dt));
    }

    /**
    * conver date format
    * @param dt java.sql.Date
    * @param formatter String (yyyyMMdd.....)
    * @return conver date format
    */
    public static String convertFormat(java.sql.Date dt, String formatter) {
        return convertFormat((java.util.Date) dt, formatter);
    }

    /**
    * conver date format
    * @param dt java.util.Date dt
    * @param formatter String formatter (yyyyMMdd.....)
    * @return String
    */
    public static String convertFormat(java.util.Date dt, String formatter) {
        SimpleDateFormat sdf = new SimpleDateFormat(formatter);
        return sdf.format(dt);
    }

    public static java.util.Date toUtilDate(long dt) {
        return new java.util.Date(dt);
    }

    /**
    * convert date String (yyyyMMdd or yyyyMMddHHmmss) to java.util.Date
    * @param dt String (yyyyMMdd or yyyyMMddHHmmss)
    * @return java.util.Date
    */
    public static java.util.Date toUtilDate(String dt) {
        if (dt == null) {
            throw new IllegalArgumentException("dt can not be null");
        }

        int len = dt.length();
        if (!(len == 8 || len == 14)) {
            throw new IllegalArgumentException("dt length must be 8 or 14 (yyyyMMdd or yyyyMMddHHmmss)");
        }

        if (dt.length() == 8) {
            dt += "000000";
        }

        return getDate(dt);
    }

    /**
    * yyyyMMddHHmmss --> java.util.Date
    * @param String dt
    * @return java.util.Date
    */
    private static java.util.Date getDate(String dt) {
        Calendar cal = Calendar.getInstance();
        cal.set(Integer.valueOf(dt.substring(0, 4)).intValue(), Integer.valueOf(dt.substring(4, 6)).intValue() - 1,
                Integer.valueOf(dt.substring(6, 8)).intValue(), Integer.valueOf(dt.substring(8, 10)).intValue(),
                Integer.valueOf(dt.substring(10, 12)).intValue(), Integer.valueOf(dt.substring(12, 14)).intValue());

        return cal.getTime();
    }
}

Related

1. getDaysLater(Date date, int days)
2. getDayStart(Date stamp)
3. getLastDateOfQuarter()
4. getLastDay(Date date)
5. getLastDay(Date dt)
6. getLastDayofMonth(Date date1)
7. getLastDayOfMonth(java.sql.Date date)
8. getLastDayOfPreviousMonth(Date date, boolean isFormatDate)
9. getLastSundayDate()