时间工具类代码,Java代码库,德仔网

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【Java】时间工具类
作者:大雅堂zacker / 发布于2013/3/18/ 663

	package com.dayatang.utils;

	import java.security.InvalidParameterException;
	import java.text.ParseException;
	import java.util.Calendar;
	import java.util.Date;

	public class DateUtils {

	private static final long MILLIS_IN_A_SECOND = 1000;

	private static final long SECONDS_IN_A_MINUTE = 60;

	private static final long MINUTES_IN_AN_HOUR = 60;

	private static final long HOURS_IN_A_DAY = 24;

	private static final int DAYS_IN_A_WEEK = 7;

	private static final int MONTHS_IN_A_YEAR = 12;

	//private static final int[] daysInMonth = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

	/**
	 * 最小日期，设定为1000年1月1日
	 */
	public static final Date MIN_DATE = date(1000, 1, 1);

	/**
	 * 最大日期，设定为8888年1月1日
	 */
	public static final Date MAX_DATE = date(8888, 1, 1);

	/**
	 * 根据年月日构建日期对象。注意月份是从1开始计数的，即month为1代表1月份。
	 * @param year 年
	 * @param month 月。注意1代表1月份，依此类推。
	 * @param day 日
	 * @return
	 */
	public static Date date(int year, int month, int date) {
	 Calendar calendar = Calendar.getInstance();
	 calendar.set(year, month - 1, date, 0, 0, 0);
	 calendar.set(Calendar.MILLISECOND, 0);
	 return calendar.getTime();
	}
	
	/**
	 * 计算两个日期（不包括时间）之间相差的周年数
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static int getYearDiff(Date date1, Date date2) {
	 if (date1 == null || date2 == null) {
	 throw new InvalidParameterException(
	 "date1 and date2 cannot be null!");
	 }
	 if (date1.after(date2)) {
	 throw new InvalidParameterException("date1 cannot be after date2!");
	 }

	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(date1);
	 int year1 = calendar.get(Calendar.YEAR);
	 int month1 = calendar.get(Calendar.MONTH);
	 int day1 = calendar.get(Calendar.DATE);

	 calendar.setTime(date2);
	 int year2 = calendar.get(Calendar.YEAR);
	 int month2 = calendar.get(Calendar.MONTH);
	 int day2 = calendar.get(Calendar.DATE);

	 int result = year2 - year1;
	 if (month2 < month1) {
	 result--;
	 } else if (month2 == month1 && day2 < day1) {
	 result--;
	 }
	 return result;
	}

	/**
	 * 计算两个日期（不包括时间）之间相差的整月数
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static int getMonthDiff(Date date1, Date date2) {
	 if (date1 == null || date2 == null) {
	 throw new InvalidParameterException(
	 "date1 and date2 cannot be null!");
	 }
	 if (date1.after(date2)) {
	 throw new InvalidParameterException("date1 cannot be after date2!");
	 }

	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(date1);
	 int year1 = calendar.get(Calendar.YEAR);
	 int month1 = calendar.get(Calendar.MONTH);
	 int day1 = calendar.get(Calendar.DATE);

	 calendar.setTime(date2);
	 int year2 = calendar.get(Calendar.YEAR);
	 int month2 = calendar.get(Calendar.MONTH);
	 int day2 = calendar.get(Calendar.DATE);

	 int months = 0;
	 if (day2 >= day1) {
	 months = month2 - month1;
	 } else {
	 months = month2 - month1 - 1;
	 }
	 return (year2 - year1) * MONTHS_IN_A_YEAR + months;
	}

	/**
	 * 统计两个日期之间包含的天数。包含date1，但不包含date2
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static int getDayDiff(Date date1, Date date2) {
	 if (date1 == null || date2 == null) {
	 throw new InvalidParameterException(
	 "date1 and date2 cannot be null!");
	 }
	 Date startDate = org.apache.commons.lang3.time.DateUtils.truncate(
	 date1, Calendar.DATE);
	 Date endDate = org.apache.commons.lang3.time.DateUtils.truncate(date2,
	 Calendar.DATE);
	 if (startDate.after(endDate)) {
	 throw new InvalidParameterException("date1 cannot be after date2!");
	 }
	 long millSecondsInOneDay = HOURS_IN_A_DAY * MINUTES_IN_AN_HOUR
	 * SECONDS_IN_A_MINUTE * MILLIS_IN_A_SECOND;
	 return (int) ((endDate.getTime() - startDate.getTime()) / millSecondsInOneDay);
	}

	/**
	 * 计算time2比time1晚多少分钟，忽略日期部分
	 *
	 * @param time1
	 * @param time2
	 * @return
	 */
	public static int getMinuteDiffByTime(Date time1, Date time2) {
	 long startMil = 0;
	 long endMil = 0;
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(time1);
	 calendar.set(1900, 1, 1);
	 startMil = calendar.getTimeInMillis();
	 calendar.setTime(time2);
	 calendar.set(1900, 1, 1);
	 endMil = calendar.getTimeInMillis();
	 return (int) ((endMil - startMil) / MILLIS_IN_A_SECOND / SECONDS_IN_A_MINUTE);
	}

	/**
	 * 计算指定日期的前一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getPrevDay(Date date) {
	 return org.apache.commons.lang3.time.DateUtils.addDays(date, -1);
	}

	/**
	 * 计算指定日期的后一天
	 *
	 * @param date
	 * @return
	 */
	public static Date getNextDay(Date date) {
	 return org.apache.commons.lang3.time.DateUtils.addDays(date, 1);
	}

	/**
	 * 判断date1是否在date2之后，忽略时间部分
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static boolean isDateAfter(Date date1, Date date2) {
	 Date theDate1 = org.apache.commons.lang3.time.DateUtils.truncate(date1,
	 Calendar.DATE);
	 Date theDate2 = org.apache.commons.lang3.time.DateUtils.truncate(date2,
	 Calendar.DATE);
	 return theDate1.after(theDate2);
	}

	/**
	 * 判断date1是否在date2之前，忽略时间部分
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static boolean isDateBefore(Date date1, Date date2) {
	 return isDateAfter(date2, date1);
	}

	/**
	 * 判断time1是否在time2之后，忽略日期部分
	 *
	 * @param time1
	 * @param time2
	 * @return
	 */
	public static boolean isTimeAfter(Date time1, Date time2) {
	 Calendar calendar1 = Calendar.getInstance();
	 calendar1.setTime(time1);
	 calendar1.set(1900, 1, 1);
	 Calendar calendar2 = Calendar.getInstance();
	 calendar2.setTime(time2);
	 calendar2.set(1900, 1, 1);
	 return calendar1.after(calendar2);
	}

	/**
	 * 判断time1是否在time2之前，忽略日期部分
	 *
	 * @param time1
	 * @param time2
	 * @return
	 */
	public static boolean isTimeBefore(Date time1, Date time2) {
	 return isTimeAfter(time2, time1);
	}

	/**
	 * 判断两个日期是否同一天（忽略时间部分）
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static boolean isSameDay(Date date1, Date date2) {
	 return org.apache.commons.lang3.time.DateUtils.isSameDay(date1, date2);
	}

	/**
	 * 判断两个日历天是否同一天（忽略时间部分）
	 *
	 * @param date1
	 * @param date2
	 * @return
	 */
	public static boolean isSameDay(Calendar date1, Calendar date2) {
	 return org.apache.commons.lang3.time.DateUtils.isSameDay(date1, date2);
	}

	/**
	 * 将字符串形式的日期表示解析为日期对象
	 *
	 * @param dateString
	 * @return
	 */
	public static Date parseDate(String dateString) {
	 try {
	 return org.apache.commons.lang3.time.DateUtils.parseDate(
	 dateString, new String[] { "yyyy-MM-dd", "yyyy-M-d",
	 "yyyy-MM-d", "yyyy-M-dd" });
	 } catch (ParseException e) {
	 return null;
	 }
	}

	/**
	 * 将字符串形式的时间表示解析为日期时间对象
	 *
	 * @param timeString
	 * @return
	 */
	public static Date parseTime(String timeString) {
	 try {
	 return org.apache.commons.lang3.time.DateUtils.parseDate(
	 timeString, new String[] { "hh:mm:ss", "h:m:s", "hh:mm",
	 "h:m" });
	 } catch (ParseException e) {
	 return null;
	 }
	}

	/**
	 * 将字符串形式的日期时间表示解析为时间对象
	 *
	 * @param timeString
	 * @return
	 */
	public static Date parseDateTime(String timeString) {
	 try {
	 return org.apache.commons.lang3.time.DateUtils.parseDate(
	 timeString, new String[] { "yyyy-MM-dd HH:mm:ss",
	 "yyyy-M-d H:m:s", "yyyy-MM-dd H:m:s",
	 "yyyy-M-d HH:mm:ss" });
	 } catch (ParseException e) {
	 return null;
	 }
	}

	/**
	 * 计算两个日期之间包含的星期X的天数。
	 *
	 * @param fromDate
	 * 起始日期
	 * @param toDate
	 * 结束日期
	 * @param dayOfWeek
	 * 星期，例如星期三，星期四
	 * @return
	 */
	public static int getWeekDaysBetween(Date fromDate, Date toDate,
	 int dayOfWeek) {
	 int result = 0;
	 Date firstDate = getFirstWeekdayBetween(fromDate, toDate, dayOfWeek);
	 if (firstDate == null) {
	 return 0;
	 }
	 Calendar aDay = Calendar.getInstance();
	 aDay.setTime(firstDate);
	 while (aDay.getTime().before(toDate)) {
	 result++;
	 aDay.add(Calendar.DATE, DAYS_IN_A_WEEK);
	 }
	 return result;
	}

	/**
	 * 获取在两个日期之间的第一个星期X
	 *
	 * @param fromDate
	 * 起始日期
	 * @param toDate
	 * 结束日期
	 * @param dayOfWeek
	 * 星期，例如星期三，星期四
	 * @return
	 */
	public static Date getFirstWeekdayBetween(Date fromDate, Date toDate,
	 int dayOfWeek) {
	 Calendar aDay = Calendar.getInstance();
	 aDay.setTime(fromDate);
	 while (aDay.getTime().before(toDate)) {
	 if (aDay.get(Calendar.DAY_OF_WEEK) == dayOfWeek) {
	 return aDay.getTime();
	 }
	 aDay.add(Calendar.DATE, 1);
	 }
	 return null;
	}

	/**
	 * 取得参数year指定的年份的总天数
	 *
	 * @param year
	 * @return
	 */
	public static int getDaysInYear(int year) {
	 Calendar aDay = Calendar.getInstance();
	 aDay.set(year, 1, 1);
	 Date from = aDay.getTime();
	 aDay.set(year + 1, 1, 1);
	 Date to = aDay.getTime();
	 return getDayDiff(from, to);
	}

	/**
	 * 取得指定年月的总天数
	 *
	 * @param year
	 * @param month
	 * @return
	 */
	public static int getDaysInMonth(int year, int month) {
	 Calendar aDay = Calendar.getInstance();
	 aDay.set(year, month, 1);
	 Date from = aDay.getTime();
	 if (month == Calendar.DECEMBER) {
	 aDay.set(year + 1, Calendar.JANUARY, 1);
	 } else {
	 aDay.set(year, month + 1, 1);
	 }
	 Date to = aDay.getTime();
	 return getDayDiff(from, to);
	}

	/**
	 * 获得指定日期的年份
	 *
	 * @param date
	 * @return
	 */
	public static int getYear(Date date) {
	 return getFieldValue(date, Calendar.YEAR);
	}

	/**
	 * 获得指定日期的月份
	 *
	 * @param date
	 * @return
	 */
	public static int getMonth(Date date) {
	 return getFieldValue(date, Calendar.MONTH) + 1;
	}

	/**
	 * 获得指定日期是当年的第几天
	 *
	 * @param date
	 * @return
	 */
	public static int getDayOfYear(Date date) {
	 return getFieldValue(date, Calendar.DAY_OF_YEAR);
	}

	/**
	 * 获得指定日期是当月的第几天
	 *
	 * @param date
	 * @return
	 */
	public static int getDayOfMonth(Date date) {
	 return getFieldValue(date, Calendar.DAY_OF_MONTH);
	}

	/**
	 * 获得指定日期是当周的第几天
	 *
	 * @param date
	 * @return
	 */
	public static int getDayOfWeek(Date date) {
	 return getFieldValue(date, Calendar.DAY_OF_WEEK);
	}

	private static int getFieldValue(Date date, int field) {
	 if (date == null) {
	 throw new InvalidParameterException("date cannot be null!");
	 }
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(date);
	 return calendar.get(field);
	}

	/**
	 * 获得指定日期之后一段时期的日期。例如某日期之后3天的日期等。
	 * @param origDate 基准日期
	 * @param amount 时间数量
	 * @param timeUnit 时间单位，如年、月、日等。用Calendar中的常量代表
	 * @return
	 */
	public static final Date dateAfter(Date origDate, int amount, int timeUnit) {
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(origDate);
	 calendar.add(timeUnit, amount);
	 return calendar.getTime();
	}

	/**
	 * 获得指定日期之前一段时期的日期。例如某日期之前3天的日期等。
	 * @param origDate 基准日期
	 * @param amount 时间数量
	 * @param timeUnit 时间单位，如年、月、日等。用Calendar中的常量代表
	 * @return
	 */
	public static final Date dateBefore(Date origDate, int amount, int timeUnit) {
	 Calendar calendar = Calendar.getInstance();
	 calendar.setTime(origDate);
	 calendar.add(timeUnit, -amount);
	 return calendar.getTime();
	}
	}
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