package util;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
 * 日期处理类
 */
public class Timer {

    /**
     * 获取某日期的上个月开始日期
     * @param currentDate
     * @param format
     * @return
     */
    public static Date getPrevMonthStartDate(String currentDate , String format){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        Calendar c = Calendar.getInstance();
        try {
            c.setTime(sdf.parse(currentDate));
            c.add(Calendar.MONTH, -1);
            //设置为1号,当前日期既为本月第一天
            c.set(Calendar.DAY_OF_MONTH, 1);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
    /**
     * 获取某日期的上个月结束日期
     * @param date
     * @param format
     * @return
     */
    public static Date getPrevMonthEndDate(String date , String format){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        Calendar c = Calendar.getInstance();
        try {
            c.setTime(sdf.parse(date));
            c.add(Calendar.MONTH , -1);
            c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
    /**
     * 获取某日期的 当前月开始日期
     * @param currentDate
     * @param format
     * @return
     */
    public static Date getMonthStartDate(String currentDate , String format){
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        Calendar c = Calendar.getInstance();
        try {
            c.setTime(sdf.parse(currentDate));
            c.add(Calendar.MONTH, 0);
            //设置为1号,当前日期既为本月第一天
            c.set(Calendar.DAY_OF_MONTH, 1);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return c.getTime();
    }

    /**
     * 获取某日期的 当前月结束日期
     * @param date
     * @param format
     * @return
     */
    public static Date getMonthEndDate(String date , String format)
    {
        SimpleDateFormat sdf = new SimpleDateFormat(format);
        Calendar c = Calendar.getInstance();
        try {
            c.setTime(sdf.parse(date));
            c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
            c.set(Calendar.HOUR_OF_DAY, 23);
            c.set(Calendar.MINUTE, 59);
            c.set(Calendar.SECOND, 59);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        return c.getTime();
    }
}