一个简单的日期工具类，计算周月季度相关值

自己写的一个简单的日期工具类，做报表的同学也许会用到。

 

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author px
 * @date 2010-04-26
 *
 */
public class DateUtils {

	private static final Log logger = LogFactory.getLog(DateUtils.class);

	public static final String YYYYMMDD = "yyyy-MM-dd";

	public static final String YYYYMMDD_ZH = "yyyy年MM月dd日";

	public static final int FIRST_DAY_OF_WEEK = Calendar.MONDAY; //中国周一是一周的第一天

	/**
	 *
	 * @param strDate
	 * @return
	 */
	public static Date parseDate(String strDate) {
		return parseDate(strDate, null);
	}

	/**
	 * parseDate
	 *
	 * @param strDate
	 * @param pattern
	 * @return
	 */
	public static Date parseDate(String strDate, String pattern) {
		Date date = null;
		try {
			if(pattern == null) {
				pattern = YYYYMMDD;
			}
			SimpleDateFormat format = new SimpleDateFormat(pattern);
			date = format.parse(strDate);
		} catch (Exception e) {
			logger.error("parseDate error:" + e);
		}
		return date;
	}

	/**
	 * format date
	 *
	 * @param date
	 * @return
	 */
	public static String formatDate(Date date) {
		return formatDate(date, null);
	}

	/**
	 * format date
	 *
	 * @param date
	 * @param pattern
	 * @return
	 */
	public static String formatDate(Date date, String pattern) {
		String strDate = null;
		try {
			if(pattern == null) {
				pattern = YYYYMMDD;
			}
			SimpleDateFormat format = new SimpleDateFormat(pattern);
			strDate = format.format(date);
		} catch (Exception e) {
			logger.error("formatDate error:", e);
		}
		return strDate;
	}

	/**
	 * 取得一年的第几周
	 *
	 * @param date
	 * @return
	 */
	public static int getWeekOfYear(Date date){
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		int week_of_year = c.get(Calendar.WEEK_OF_YEAR);
		return week_of_year - 1;
	}

	/**
	 * getWeekBeginAndEndDate
	 *
	 * @param date
	 * @param pattern
	 * @return
	 */
	public static String getWeekBeginAndEndDate(Date date, String pattern){
		Date monday = getMondayOfWeek(date);
		Date sunday = getSundayOfWeek(date);
		return formatDate(monday, pattern) + " - " + formatDate(sunday, pattern) ;
	}

	/**
	 * 根据日期取得对应周周一日期
	 *
	 * @param date
	 * @return
	 */
	public static Date getMondayOfWeek(Date date) {
		Calendar monday = Calendar.getInstance();
		monday.setTime(date);
		monday.setFirstDayOfWeek(FIRST_DAY_OF_WEEK);
		monday.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
		return monday.getTime();
	}

	/**
	 * 根据日期取得对应周周日日期
	 *
	 * @param date
	 * @return
	 */
	public static Date getSundayOfWeek(Date date) {
		Calendar sunday = Calendar.getInstance();
		sunday.setTime(date);
		sunday.setFirstDayOfWeek(FIRST_DAY_OF_WEEK);
		sunday.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
		return sunday.getTime();
	}

	/**
	 * 取得月的剩余天数
	 *
	 * @param date
	 * @return
	 */
	public static int getRemainDayOfMonth(Date date) {
		int dayOfMonth = getDayOfMonth(date);
		int day = getPassDayOfMonth(date);
		return dayOfMonth - day;
	}

	/**
	 * 取得月已经过的天数
	 *
	 * @param date
	 * @return
	 */
	public static int getPassDayOfMonth(Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		return c.get(Calendar.DAY_OF_MONTH);
	}

	/**
	 * 取得月天数
	 *
	 * @param date
	 * @return
	 */
	public static int getDayOfMonth(Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		return c.getActualMaximum(Calendar.DAY_OF_MONTH);
	}

	/**
	 * 取得月第一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getFirstDateOfMonth(Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		c.set(Calendar.DAY_OF_MONTH, c.getActualMinimum(Calendar.DAY_OF_MONTH));
		return c.getTime();
	}

	/**
	 * 取得月最后一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getLastDateOfMonth(Date date) {
		Calendar c = Calendar.getInstance();
		c.setTime(date);
		c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
		return c.getTime();
	}

	/**
	 * 取得季度第一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getFirstDateOfSeason(Date date) {
		return getFirstDateOfMonth(getSeasonDate(date)[0]);
	}

	/**
	 * 取得季度最后一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getLastDateOfSeason(Date date) {
		return getLastDateOfMonth(getSeasonDate(date)[2]);
	}

	/**
	 * 取得季度天数
	 * @param date
	 * @return
	 */
	public static int getDayOfSeason(Date date) {
		int day = 0;
		Date[] seasonDates  = getSeasonDate(date);
		for (Date date2 : seasonDates) {
			day += getDayOfMonth(date2);
		}
		return day;
	}

	/**
	 * 取得季度剩余天数
	 *
	 * @param date
	 * @return
	 */
	public static int getRemainDayOfSeason(Date date) {
		return getDayOfSeason(date) - getPassDayOfSeason(date);
	}

	/**
	 * 取得季度已过天数
	 *
	 * @param date
	 * @return
	 */
	public static int getPassDayOfSeason(Date date) {
		int day = 0;

		Date[] seasonDates  = getSeasonDate(date);

		Calendar c = Calendar.getInstance();
		c.setTime(date);
		int month = c.get(Calendar.MONTH);

		if(month == Calendar.JANUARY || month == Calendar.APRIL || month == Calendar.JULY || month == Calendar.OCTOBER) {//季度第一个月
			day = getPassDayOfMonth(seasonDates[0]);
		} else if(month == Calendar.FEBRUARY || month == Calendar.MAY || month == Calendar.AUGUST || month == Calendar.NOVEMBER) {//季度第二个月
			day = getDayOfMonth(seasonDates[0]) + getPassDayOfMonth(seasonDates[1]);
		} else if(month == Calendar.MARCH || month == Calendar.JUNE || month == Calendar.SEPTEMBER || month == Calendar.DECEMBER) {//季度第三个月
			day = getDayOfMonth(seasonDates[0]) + getDayOfMonth(seasonDates[1]) + getPassDayOfMonth(seasonDates[2]);
		}
		return day;
	}

	/**
	 * 取得季度月
	 *
	 * @param date
	 * @return
	 */
	public static Date[] getSeasonDate(Date date) {
		Date[] season = new Date[3];

		Calendar c = Calendar.getInstance();
		c.setTime(date);

		int nSeason = getSeason(date);
		if(nSeason == 1) {//第一季度
			c.set(Calendar.MONTH, Calendar.JANUARY);
			season[0] = c.getTime();
			c.set(Calendar.MONTH, Calendar.FEBRUARY);
			season[1] = c.getTime();
			c.set(Calendar.MONTH, Calendar.MARCH);
			season[2] = c.getTime();
		} else if(nSeason == 2) {//第二季度
			c.set(Calendar.MONTH, Calendar.APRIL);
			season[0] = c.getTime();
			c.set(Calendar.MONTH, Calendar.MAY);
			season[1] = c.getTime();
			c.set(Calendar.MONTH, Calendar.JUNE);
			season[2] = c.getTime();
		} else if(nSeason == 3) {//第三季度
			c.set(Calendar.MONTH, Calendar.JULY);
			season[0] = c.getTime();
			c.set(Calendar.MONTH, Calendar.AUGUST);
			season[1] = c.getTime();
			c.set(Calendar.MONTH, Calendar.SEPTEMBER);
			season[2] = c.getTime();
		} else if(nSeason == 4) {//第四季度
			c.set(Calendar.MONTH, Calendar.OCTOBER);
			season[0] = c.getTime();
			c.set(Calendar.MONTH, Calendar.NOVEMBER);
			season[1] = c.getTime();
			c.set(Calendar.MONTH, Calendar.DECEMBER);
			season[2] = c.getTime();
		}
		return season;
	}

	/**
	 *
	 * 1 第一季度  2 第二季度 3 第三季度 4 第四季度
	 *
	 * @param date
	 * @return
	 */
	public static int getSeason(Date date) {

		int season = 0;

		Calendar c = Calendar.getInstance();
		c.setTime(date);
		int month = c.get(Calendar.MONTH);
		switch (month) {
			case Calendar.JANUARY:
			case Calendar.FEBRUARY:
			case Calendar.MARCH:
				season =  1;
				break;
			case Calendar.APRIL:
			case Calendar.MAY:
			case Calendar.JUNE:
				season =  2;
				break;
			case Calendar.JULY:
			case Calendar.AUGUST:
			case Calendar.SEPTEMBER:
				season =  3;
				break;
			case Calendar.OCTOBER:
			case Calendar.NOVEMBER:
			case Calendar.DECEMBER:
				season =  4;
				break;
			default:
				break;
		}
		return season;
	}

	public static void main(String[] args) {
		String strDate = "2010-03-26";
		Date date = parseDate(strDate);
		System.out.println(strDate + " 是一年的第几周？" + getWeekOfYear(date));
		System.out.println(strDate + " 所在周起始结束日期？" + getWeekBeginAndEndDate(date, "yyyy年MM月dd日"));
		System.out.println(strDate + " 所在周周一是？" + formatDate(getMondayOfWeek(date)));
		System.out.println(strDate + " 所在周周日是？" + formatDate(getSundayOfWeek(date)));

		System.out.println(strDate + " 当月第一天日期？" + formatDate(getFirstDateOfMonth(date)));
		System.out.println(strDate + " 当月最后一天日期？" + formatDate(getLastDateOfMonth(date)));
		System.out.println(strDate + " 当月天数？" + getDayOfMonth(date));
		System.out.println(strDate + " 当月已过多少天？" + getPassDayOfMonth(date));
		System.out.println(strDate + " 当月剩余多少天？" + getRemainDayOfMonth(date));

		System.out.println(strDate + " 所在季度第一天日期？" + formatDate(getFirstDateOfSeason(date)));
		System.out.println(strDate + " 所在季度最后一天日期？" + formatDate(getLastDateOfSeason(date)));
		System.out.println(strDate + " 所在季度天数？" + getDayOfSeason(date));
		System.out.println(strDate + " 所在季度已过多少天？" + getPassDayOfSeason(date));
		System.out.println(strDate + " 所在季度剩余多少天？" + getRemainDayOfSeason(date));
		System.out.println(strDate + " 是第几季度？" + getSeason(date));
		System.out.println(strDate + " 所在季度月份？" + formatDate(getSeasonDate(date)[0], "yyyy年MM月") + "/" + formatDate(getSeasonDate(date)[1], "yyyy年MM月") + "/" + formatDate(getSeasonDate(date)[2], "yyyy年MM月"));
	}
}