package tools;

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

public class DateTools {
	static SimpleDateFormat smp = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss") ;
	public static Date strToDateTime(String s) {
		if (s==null) return null ;
		try {
			return smp.parse(s);
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	public static String dateToStr(Date s) {
		if (s==null) return null ;
		return smp.format(s);

	}
	public static int getYear(Date dt) {
		if (dt==null) {
			return -1;
		}
		String s = smp.format(dt);
		return Integer.valueOf(s.substring(0,4)) ;
	}
	public static int getMonth(Date dt) {
		if (dt==null) {
			return -1;
		}
		String s = smp.format(dt);
		return Integer.valueOf(s.substring(5,7)) ;
	}
	public static int getDays(Date dt) {
		if (dt==null) {
			return -1;
		}
		String s = smp.format(dt);
		return Integer.valueOf(s.substring(8,10)) ;
	}
	public static void main(String s[]) {
		System.out.println(DateTools.getYear(new Date()));
		System.out.println(DateTools.getMonth(new Date()));
		System.out.println(DateTools.getDays(new Date()));
		
	}
}