package cn.com.basic.face.util;

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

public class DateUtil {

    private static SimpleDateFormat yyyy_MM_dd = new SimpleDateFormat("yyyy-MM-dd");

    private static SimpleDateFormat yyyy年MM月dd日 = new SimpleDateFormat("yyyy年MM月dd日");

    public static String format() {
        return yyyy_MM_dd.format(new Date());
    }

    public static String format(Date date) {
        return yyyy_MM_dd.format(date);
    }

    public static String yyyy年MM月dd日(Date date) {
        return yyyy年MM月dd日.format(date);
    }

    public static String yyyy年MM月dd日() {
        return yyyy年MM月dd日.format(new Date());
    }

    public static String yyyy_MM_dd_to_yyyy年MM月dd日(String date) {
        try {
            return yyyy年MM月dd日.format(yyyy_MM_dd.parse(date));
        } catch (Exception e) {
            return "";
        }
    }

    public static String getPreviousMonthLastDay() {
        Calendar aCalendar = Calendar.getInstance();
        // add -1 month to current month
        aCalendar.add(Calendar.MONTH, -1);
        // set DATE to 1, so first date of previous month
        aCalendar.set(Calendar.DATE, 1);

        Date firstDateOfPreviousMonth = aCalendar.getTime();

        // set actual maximum date of previous month
        aCalendar.set(Calendar.DATE, aCalendar.getActualMaximum(Calendar.DAY_OF_MONTH));
        //read it
        Date lastDateOfPreviousMonth = aCalendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            return sdf.format(lastDateOfPreviousMonth) + " 23:59:59";
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

    public static String getYesterday() {
        Calendar aCalendar = Calendar.getInstance();
        aCalendar.add(Calendar.DATE, -1);

        Date lastDateOfPreviousMonth = aCalendar.getTime();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        try {
            return sdf.format(lastDateOfPreviousMonth) + " 23:59:59";
        } catch (Exception e) {
            e.printStackTrace();
            return "";
        }
    }

}