package com.gkhy.safePlatform.emergency.utils;

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

public class TimeUtils {

    public static String formatDate(Date date){
        SimpleDateFormat f = new SimpleDateFormat("yyyy-MM-dd");
        String sDate = f.format(date);
        return sDate;
    }

    /**
     * 获取某年第一天日期
     * @param year 年份
     * @return Date
     */
    public static String getYearFirst(int year){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        Date currYearFirst = calendar.getTime();
        return formatDate(currYearFirst);
    }

    /**
     * 获取某年最后一天日期
     * @param year 年份
     * @return Date
     */
    public static String getYearLast(int year){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        calendar.roll(Calendar.DAY_OF_YEAR, -1);
        Date currYearLast = calendar.getTime();

        return formatDate(currYearLast);
    }

    /**
     * 获取某月第一天日期
     * @param month 年份
     * @return Date
     */
    public static String getMonthFirst(int year ,int month){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month-1);
        Date currYearFirst = calendar.getTime();
        return formatDate(currYearFirst);
    }

    /**
     * 获取某月最后一天日期
     * @param month 年份
     * @return Date
     */
    public static String getMonthLast(int year ,int month){
        Calendar calendar = Calendar.getInstance();
        calendar.clear();
        calendar.set(Calendar.YEAR, year);
        calendar.set(Calendar.MONTH, month-1);
        calendar.roll(Calendar.DAY_OF_MONTH, -1);
        Date currYearLast = calendar.getTime();

        return formatDate(currYearLast);
    }


    public static void main(String[] args) {
        Calendar date = Calendar.getInstance();
        int year = date.get(Calendar.YEAR);
        int month = date.get(Calendar.MONTH);
        System.out.println(getMonthLast(year,2));
    }
}