dateutil.java

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package com.tarena.util;

import java.sql.Date;
import java.sql.Timestamp;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;

public class DateUtil {
	private static final long monthInterval = ((long) 24 * 60) * 60 * 1000 * 32;

	private static final String timestampStrFormat = "yyyy-MM-dd hh:mm:ss.SSS";

	private static final String dateStrFormat = "yyyy-MM-dd hh:mm:ss";

	public static int getYear(Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		return c.get(Calendar.YEAR);
	}

	public static Date getCurrentDate() {
		return new Date(System.currentTimeMillis());
	}

	public static boolean isMonthInterval(Timestamp time1, Timestamp time2) {
		long t1 = time1.getTime();
		long t2 = time2.getTime();
		if (Math.abs(t1 - t2) > monthInterval)
			return false;
		return true;
	}

	public static Timestamp getStartTimestampByYear(int year) {
		String dateStr = String.valueOf(year) + "-01-01 00:00:00.000";
		SimpleDateFormat sdf = new SimpleDateFormat(timestampStrFormat);
		Timestamp t = null;
		try {
			t = new Timestamp(sdf.parse(dateStr).getTime());
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return t;
	}

	public static Timestamp getEndTimestampByYear(int year) {
		String dateStr = String.valueOf(year) + "-12-31 23:59:59.999";
		SimpleDateFormat sdf = new SimpleDateFormat(timestampStrFormat);
		Timestamp t = null;
		try {
			t = new Timestamp(sdf.parse(dateStr).getTime());
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return t;
	}

	public static Timestamp getStartTimestampByYearAndMonth(int year,
			int month) {
		String dateStr = String.valueOf(year) + "-"
				+ (month > 9 ? "" : "0")
				+ String.valueOf(month) + "-01 00:00:00.000";
		SimpleDateFormat sdf = new SimpleDateFormat(timestampStrFormat);
		Timestamp t = null;
		try {
			t = new Timestamp(sdf.parse(dateStr).getTime());
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return t;
	}

	public static Timestamp getEndTimestampByYearAndMonth(int year,
			int month) {
		String lastDay = String.valueOf(getLastDay(year, month));
		String dateStr = String.valueOf(year) + "-"
				+ (month > 9 ? "" : "0")
				+ String.valueOf(month) + "-" + lastDay
				+ " 23:59:59.999";
		SimpleDateFormat sdf = new SimpleDateFormat(timestampStrFormat);
		Timestamp t = null;
		try {
			t = new Timestamp(sdf.parse(dateStr).getTime());
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return t;
	}

	public static Date getStartTimeByYearAndMonth(int year, int month) {
		String dateStr = String.valueOf(year) + "-"
				+ (month > 9 ? "" : "0")
				+ String.valueOf(month) + "-01 00:00:00";
		SimpleDateFormat sdf = new SimpleDateFormat(dateStrFormat);
		Date date = null;
		try {
			date = new Date(sdf.parse(dateStr).getTime());
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return date;
	}

	public static Date getEndTimeByYearAndMonth(int year, int month) {
		String lastDay = String.valueOf(getLastDay(year, month));
		String dateStr = String.valueOf(year) + "-"
				+ (month > 9 ? "" : "0")
				+ String.valueOf(month) + "-" + lastDay
				+ " 23:59:59";
		SimpleDateFormat sdf = new SimpleDateFormat(dateStrFormat);
		Date date = null;
		try {
			date = new Date(sdf.parse(dateStr).getTime());
		} catch (ParseException e) {
			e.printStackTrace();
		}
		return date;
	}

	public static int getLastDay(int year, int month) {
		int[] monthDays = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30,
				31 };
		int value = 0;
		if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
			value = 1;
		}
		return monthDays[month - 1] + value;
	}
}