Java的时间操作玩法实例若干
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众所周知，时间日期在业务中十分重要，也是几乎所有开发人员必须处理的。除了一些框架和语言提供的时间日期处理工具之外，一些操时间日期的代码也是广大开发人员必备的。因此我们常常将其作为工具类放在项目中。
下面是一些时间日期处理的常见方法，可以为开发者使用，亦可为学习者参考。
import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.HashSet;import java.util.List;import java.util.Map;import java.util.Set;import org.apache.commons.lang.StringUtils;/** * time utility * @author */public class DateUtil { /** * Check style rule: utility classes should not have public constructor */ private DateUtil() { } // Time Format private static final String FORMAT_YYYY_MM_DD_T_HH_MM_SS = "yyyy-MM-dd'T'HH:mm:ss"; private static final String FORMAT_YYYY_MM_DD = "yyyy-MM-dd"; /** * 获取指定日期的所在周的第一天的日期 * @param date * @return */ public static Date getFirstDayOfWeek(Date date) { Calendar c = new GregorianCalendar(); c.setFirstDayOfWeek(Calendar.MONDAY); c.setTime(date); c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); return c.getTime(); } /** * 取得指定日期所在周的最后一天 * * @param date * @return */ public static Date getLastDayOfWeek(Date date) { Calendar c = new GregorianCalendar(); c.setFirstDayOfWeek(Calendar.MONDAY); c.setTime(date); c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday return c.getTime(); } /** * Return default datePattern (yyyy-MM-dd) * * @return a string representing the date pattern on the UI */ public static String getDatePattern() { String defaultDatePattern = FORMAT_YYYY_MM_DD; return defaultDatePattern; } public static String getDateTimePattern() { return DateUtil.getDatePattern() + " HH:mm:ss.S"; } /** * Clear time, only keep yyyy-MM-dd 清除时分秒，只保存年月日 * * @return */ public static Date getCleanDate(Date date) { Date cleanDate = null; try { String strDate = DateUtil.getDate(date); cleanDate = DateUtil.convertStringToDate(strDate); } catch (ParseException e) { e.printStackTrace(); } return cleanDate; } /** * This method attempts to convert date to format yyyy-MM-dd. * * @param aDate * date from database as a string * @return formatted string for the ui */ public static String getDate(Date aDate) { SimpleDateFormat df; String returnValue = ""; if (aDate != null) { df = new SimpleDateFormat(getDatePattern()); returnValue = df.format(aDate); } return (returnValue); } /** * This method generates a string representation of a date/time in the * format you specify on input * * @param aMask * the date pattern the string is in * @param strDate * a string representation of a date * @return a converted Date object * @throws ParseException * when String doesn't match the expected format * @see java.text.SimpleDateFormat */ public static Date convertStringToDate(String aMask, String strDate) throws ParseException { if (strDate == null) { return null; } SimpleDateFormat df; Date date; df = new SimpleDateFormat(aMask); try { date = df.parse(strDate); } catch (ParseException pe) { throw new ParseException(pe.getMessage(), pe.getErrorOffset()); } return (date); } /** * This method returns the current date time in the format: MM/dd/yyyy * HH:MM:SS * * @param theTime * the current time * @return the current date/time */ public static String getTimeNow(Date theTime) { return getDateTime(FORMAT_YYYY_MM_DD_T_HH_MM_SS, theTime); } /** * This method returns the current date with clean time: yyyy-MM-dd * * @return the current date * @throws ParseException * when String doesn't match the expected format */ public static Calendar getToday() { Date today = currentDateTime(); SimpleDateFormat df = new SimpleDateFormat(getDatePattern()); // This seems like quite a hack (date -> string -> date), // but it works ;-) String todayAsString = df.format(today); Calendar cal = new GregorianCalendar(); try { cal.setTime(convertStringToDate(todayAsString)); } catch (ParseException e) { throw new RuntimeException( "unexpcepted exception, should not happen", e); } return cal; } public static Date currentDateTime() { return new Date(); } /** 返回今天的日期，不带时分秒 */ public static Date currentDate() { try { return convertStringToDate(convertDateToString(new Date())); } catch (ParseException e) { e.printStackTrace(); } return null; } /** 返回不带时分秒的日期 */ public static Date cleanTimeDate(Date date) { try { return convertStringToDate(convertDateToString(date)); } catch (Exception e) { e.printStackTrace(); } return null; } /** * This method generates a string representation of a date's date/time in * the format you specify on input * * @param aMask * the date pattern the string is in * @param aDate * a date object * @return a formatted string representation of the date * @see java.text.SimpleDateFormat */ public static String getDateTime(String aMask, Date aDate) { SimpleDateFormat df = null; String returnValue = ""; if (aDate == null) { System.out.println("aDate is null!"); } else { df = new SimpleDateFormat(aMask); returnValue = df.format(aDate); } return (returnValue); } public static Date convertDateToDate(String aMask, Date date) { if (date == null) { System.out.println("date is null!"); return null; } String createTime = DateUtil.getDateTime(aMask, date); try { return convertStringToDate(aMask, createTime); } catch (ParseException e) { e.printStackTrace(); return null; } } /** * This method generates a string representation of a date based on the * System Property 'dateFormat' in the format you specify on input * * @param aDate * A date to convert * @return a string representation of the date */ public static String convertDateToString(Date aDate) { return getDateTime(getDatePattern(), aDate); } /** * This method converts a String to a date using the datePattern * * @param strDate * the date to convert (in format MM/dd/yyyy) * @return a date object * @throws ParseException * when String doesn't match the expected format */ public static Date convertStringToDate(final String strDate) throws ParseException { return convertStringToDate(getDatePattern(), strDate); } /** * 取一天的开始 * * @param aMask * @param strDate * @return * @throws ParseException */ public static Date getDaysBegin(String aMask, String strDate) { Date date = null; try { date = convertStringToDate(aMask, strDate); date = daysBegin(date); } catch (ParseException e) { e.printStackTrace(); } return date; } public static Date daysBegin(Date date) { Calendar cal = new GregorianCalendar(); cal.setTime(date); cal.set(Calendar.HOUR, 0); cal.set(Calendar.MINUTE, 0); cal.set(Calendar.SECOND, 0); date = cal.getTime(); return date; } /** * 取一天的结束 * * @param aMask * @param strDate * @return * @throws ParseException */ public static Date getDaysEnd(String aMask, String strDate) { Date date = null; try { date = convertStringToDate(aMask, strDate); date = daysEnd(date); } catch (ParseException e) { e.printStackTrace(); } return date; } public static Date daysEnd(Date date) { Calendar cal = Calendar.getInstance(); cal.setTime(date); cal.set(Calendar.HOUR, 23); cal.set(Calendar.MINUTE, 59); cal.set(Calendar.SECOND, 59); date = cal.getTime(); return date; } /** 获得每个月的第一天是星期几 */ public static int getWeek(final int y, final int m) { Calendar cal = Calendar.getInstance();// 获得当前日期时间的方法 cal.set(Calendar.YEAR, y); // 设置改为你输入的年 cal.set(Calendar.MONTH, m - 1); cal.set(Calendar.DATE, 1); int w = cal.get(Calendar.DAY_OF_WEEK) - 1;// 获得每个月第一天是星期几 return (w);// 返回星期几 } /** 获得每个月天数 */ public static int getDay(final int y, final int m) { int day; if ((y % 100 == 0) || (y % 4 == 0 && y % 100 != 0)) { int[] days = { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; day = days[m - 1]; } else { int[] days1 = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; day = days1[m - 1]; } return day; } /** * 获取一段时间内的天 * * @param ksrq * 格式：2012-05-01 * @param jsrq * 格式：2012-06-01 * @return */ @SuppressWarnings("static-access") public static List getDays(String ksrq, String jsrq) { List list = new ArrayList (); try { Date d_ksrq = convertStringToDate(FORMAT_YYYY_MM_DD, ksrq); Date d_jsrq = convertStringToDate(FORMAT_YYYY_MM_DD, jsrq); list.add(getDateTime(FORMAT_YYYY_MM_DD, d_ksrq)); while (d_jsrq.after(d_ksrq)) { Calendar cal = Calendar.getInstance(); cal.setTime(d_ksrq); cal.add(cal.DATE, 1); d_ksrq = cal.getTime(); list.add(getDateTime(FORMAT_YYYY_MM_DD, d_ksrq)); } } catch (ParseException e) { e.printStackTrace(); } return list; } /** * 获取一段时间内的天 * * @param ksrq * 格式：2012-05-01 * @param jsrq * 格式：2012-06-01 * @return */ @SuppressWarnings("static-access") public static List getDays(Date d_ksrq, Date d_jsrq) { List list = new ArrayList (); try { list.add(getDateTime(FORMAT_YYYY_MM_DD, d_ksrq)); while (d_jsrq.after(d_ksrq)) { Calendar cal = Calendar.getInstance(); cal.setTime(d_ksrq); cal.add(cal.DATE, 1); d_ksrq = cal.getTime(); list.add(getDateTime(FORMAT_YYYY_MM_DD, d_ksrq)); } } catch (Exception e) { e.printStackTrace(); } return list; } /** * 获取一段时间内的天 * * @param ksrq * 格式：2012-05-01 * @param jsrq * 格式：2012-06-01 * @return List */ @SuppressWarnings("static-access") public static List getDayList(Date d_ksrq, Date d_jsrq) { List list = new ArrayList (); try { list.add(d_ksrq); while (d_jsrq.after(d_ksrq)) { Calendar cal = Calendar.getInstance(); cal.setTime(d_ksrq); cal.add(cal.DATE, 1); d_ksrq = cal.getTime(); list.add(d_ksrq); } } catch (Exception e) { e.printStackTrace(); } return list; } /** 根据一段日期获取其中所有星期几的日期,星期以1~7表示 */ public static List getWeekDay(String dateFromStr, String dateToStr, int dayOfWeek) throws Exception { Date sd = DateUtil.convertStringToDate(FORMAT_YYYY_MM_DD, dateFromStr); Date ed = DateUtil.convertStringToDate(FORMAT_YYYY_MM_DD, dateToStr); if (dayOfWeek == 7) { dayOfWeek = 0; } Calendar c = Calendar.getInstance(); c.setTime(sd); int day = c.get(Calendar.DAY_OF_WEEK) - 1; List tmp = new ArrayList (); if (day != dayOfWeek) { int dif = dayOfWeek < day ? (dayOfWeek - day + 7) : (dayOfWeek - day); c.add(Calendar.DATE, dif); } while (!c.getTime().after(ed)) { tmp.add(DateUtil.getDateTime(FORMAT_YYYY_MM_DD, c.getTime())); c.add(Calendar.DATE, 7); } return tmp; } public static List getWeekDay(String dateFromStr, String dateToStr, int[] dayOfWeeks) throws ParseException { Date sd = DateUtil.convertStringToDate(FORMAT_YYYY_MM_DD, dateFromStr); Date ed = DateUtil.convertStringToDate(FORMAT_YYYY_MM_DD, dateToStr); Set daySet = new HashSet (); for (int i = 0; i < dayOfWeeks.length; i++) { if (dayOfWeeks[i] == 7) { daySet.add(0); } else if (dayOfWeeks[i] < 0 || dayOfWeeks[i] > 6) { continue; } else { daySet.add(dayOfWeeks[i]); } } Calendar start = Calendar.getInstance(); start.setTime(sd); List tmp = new ArrayList (); while (!start.getTime().after(ed)) { if (daySet.contains(start.get(Calendar.DAY_OF_WEEK) - 1)) { tmp.add(DateUtil.getDateTime(FORMAT_YYYY_MM_DD, start.getTime())); } start.add(Calendar.DATE, 1); } return tmp; } public static List getWeekDay(Date sd, Date ed, int[] dayOfWeeks) throws ParseException { Set daySet = new HashSet (); for (int i = 0; i < dayOfWeeks.length; i++) { if (dayOfWeeks[i] == 7) { daySet.add(0); } else if (dayOfWeeks[i] < 0 || dayOfWeeks[i] > 6) { continue; } else { daySet.add(dayOfWeeks[i]); } } Calendar start = Calendar.getInstance(); start.setTime(sd); List tmp = new ArrayList (); while (!start.getTime().after(ed)) { if (daySet.contains(start.get(Calendar.DAY_OF_WEEK) - 1)) { tmp.add(DateUtil.getDateTime(FORMAT_YYYY_MM_DD, start.getTime())); } start.add(Calendar.DATE, 1); } return tmp; } public static List getMonthWeekDay(String month, int[] dayOfWeeks) throws ParseException { Date startDate = DateUtil.convertStringToDate(month); Calendar first = Calendar.getInstance(); first.setTime(startDate); first.set(Calendar.DAY_OF_MONTH, 1); int maxDays = first.getActualMaximum(Calendar.DAY_OF_MONTH); Calendar end = Calendar.getInstance(); end.setTime(startDate); end.set(Calendar.DAY_OF_MONTH, maxDays); return getWeekDay(DateUtil.getDate(first.getTime()), DateUtil.getDate(end.getTime()), dayOfWeeks); } public static List getMonthWeekDay(String[] months, int[] dayOfWeeks) throws ParseException { List result = new ArrayList (); for (String month : months) { if (StringUtils.isNotBlank(month)) { result.addAll(getMonthWeekDay(month, dayOfWeeks)); } } return result; } /** * 计算两个日期之间的天数 * * @param startTime * @param endTime * @param format * @return */ public static Integer dateDiff(Date startTime, Date endTime) { try { Float nd = new Float(1000 * 24 * 60 * 60);// 一天的毫秒数 Float diff = new Float(endTime.getTime() - startTime.getTime()); Float day = diff / nd;// 计算差多少天 return day.intValue(); } catch (Exception e) { return 0; } } /** * 两个日期之间相差多少天 默认格式yyyy-MM-dd */ public static Long dateDiff(String startTime, String endTime) { return dateDiff(startTime, endTime, getDatePattern()); } /** * 两个日期之间相差多少天 * * @param startTime * @param endTime * @param format * @return */ public static Long dateDiff(String startTime, String endTime, String format) { // 按照传入的格式生成一个simpledateformate对象 SimpleDateFormat sd = new SimpleDateFormat(format); long nd = 1000 * 24 * 60 * 60;// 一天的毫秒数 // long nh = 1000 * 60 * 60;// 一小时的毫秒数 // long nm = 1000 * 60;// 一分钟的毫秒数 // long ns = 1000;// 一秒钟的毫秒数 long diff; try { // 获得两个时间的毫秒时间差异 diff = sd.parse(endTime).getTime() - sd.parse(startTime).getTime(); long day = diff / nd;// 计算差多少天 // long hour = diff % nd / nh;// 计算差多少小时 // long min = diff % nd % nh / nm;// 计算差多少分钟 // long sec = diff % nd % nh % nm / ns;// 计算差多少秒 return day; } catch (ParseException e) { e.printStackTrace(); } return null; } public static Date[] getCalendar(Date date) { Calendar first = Calendar.getInstance(); first.setTime(date); first.set(Calendar.DAY_OF_MONTH, 1); first.add(Calendar.DATE, -(first.get(Calendar.DAY_OF_WEEK) - 1)); Calendar last = Calendar.getInstance(); last.setTime(date); last.set(Calendar.DAY_OF_MONTH, getDay(last.get(Calendar.YEAR), last.get(Calendar.MONTH) + 1)); last.add(Calendar.DATE, (7 - last.get(Calendar.DAY_OF_WEEK))); Date[] dates = new Date[] { first.getTime(), last.getTime() }; return dates; } public static Date[] get42DayCalendar(Date date) { Calendar first = Calendar.getInstance(); first.setTime(date); first.set(Calendar.DAY_OF_MONTH, 1); first.add(Calendar.DATE, -(first.get(Calendar.DAY_OF_WEEK) - 1)); Calendar last = Calendar.getInstance(); last.setTime(first.getTime()); last.add(Calendar.DATE, 41); Date[] dates = new Date[] { first.getTime(), last.getTime() }; return dates; } public static int getDayOfYear(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); return c.get(Calendar.DAY_OF_YEAR); } public static Date nextDay(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.DATE, +1); return c.getTime(); } public static Date previousMonth(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.MONTH, -1); return c.getTime(); } public static Date nextMonth(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.MONTH, +1); return c.getTime(); } public static Date lastMonth(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.MONTH, -1); return c.getTime(); } public static Date cloneDate(Date date) { Calendar c = Calendar.getInstance(); c.setTime(date); return c.getTime(); } public static String convertDateTimeToString(Date date) { String pattern = FORMAT_YYYY_MM_DD + " HH:mm:ss"; return getDateTime(pattern, date); } /** * 生成从开始日期到结束日期内的日期列表,如果星期标识不为空的时候，只包含flag为true的日期 * * @param startDateStr * @param endDateStr * @return */ @SuppressWarnings("rawtypes") public static List createDateList(String startDateStr, String endDateStr, Map weekFlag) { List dateList = new ArrayList (); try { Date startDate = convertStringToDate(FORMAT_YYYY_MM_DD_T_HH_MM_SS, startDateStr); Date endDate = convertStringToDate(FORMAT_YYYY_MM_DD_T_HH_MM_SS, endDateStr); int days = dateDiff(startDate, endDate); final String weekNames[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; for (int i = 0; i <= days; i++) { Calendar c = Calendar.getInstance(); c.setTime(startDate); c.add(Calendar.DATE, i); Date varDate = c.getTime(); if (weekFlag != null) { String weekName = weekNames[c.get(Calendar.DAY_OF_WEEK) - 1]; boolean include = (Boolean) weekFlag.get(weekName); if (include) { dateList.add(varDate); } } else { dateList.add(varDate); } } } catch (ParseException e) { e.printStackTrace(); } return dateList; } /** * 获取当前年月+11个月 * * */ public static List getOneYearDate() { List list = new ArrayList (); Calendar c = Calendar.getInstance(); list.add(c.getTime()); for (int i = 0; i < 11; i++) { c.add(Calendar.MONTH, +1); list.add(c.getTime()); } return list; } /** * 取一年后的日期 * * @return */ public static Date getAfterYearTime() { Date date = currentDateTime(); long afterTime = (date.getTime() / 1000) + 60 * 60 * 24 * 365; date.setTime(afterTime * 1000); return date; } public static List splitTimeByDays(Date start, Date end, int days) { return splitTimeByHours(start, end, 24 * days); } public static List splitTimeByHours(Date start, Date end, int hours) { List dl = new ArrayList (); while (start.compareTo(end) < 0) { Date _end = addHours(start, hours); if (_end.compareTo(end) > 0) { _end = end; } Date[] dates = new Date[] { (Date) start.clone(), (Date) _end.clone() }; dl.add(dates); start = _end; } return dl; } public static Date addMinutes(Date date, int amount) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.MINUTE, amount); return c.getTime(); } /** * * @param date * @param hhmm * @return */ public static Date setDateHHmmss(Date date, int hour, int minute, int second) { Calendar c = Calendar.getInstance(); c.setTime(date); c.set(Calendar.HOUR_OF_DAY, hour); c.set(Calendar.MINUTE, minute); c.set(Calendar.SECOND, second); return c.getTime(); } public static Date addHours(Date date, int amount) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.HOUR_OF_DAY, amount); return c.getTime(); } public static Date addDays(Date date, int amount) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.DAY_OF_MONTH, amount); return c.getTime(); } public static Date addMonths(Date date, int amount) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.MONTH, amount); return c.getTime(); } /** * 获取指定时间所在月的最后一天 * @return */ public static String getMonthLastDay(Date start) { Calendar calendar = Calendar.getInstance(); calendar.setTime(start); int endday = calendar.getActualMaximum(Calendar.DAY_OF_MONTH); calendar.set(Calendar.DATE, endday); return convertDateToString(calendar.getTime()); } /** * 根据年和月获取所在月的最后一天的日期 * * @return */ public static String getMonthLastDay(int year, int month) { Calendar calendar = Calendar.getInstance(); calendar.set(year, month - 1, 1); int endday = calendar.getActualMaximum(Calendar.DAY_OF_MONTH); calendar.set(Calendar.DATE, endday); return convertDateToString(calendar.getTime()); } /** * 根据年和月获取所在月的最后一天的日期 * * @return */ public static Date getMonthLastDayByYM(int year, int month) { Calendar calendar = Calendar.getInstance(); calendar.set(year, month - 1, 1); int endday = calendar.getActualMaximum(Calendar.DAY_OF_MONTH); calendar.set(Calendar.DATE, endday); return calendar.getTime(); } /** * 判断日期是否是周末 * * @param date * @return */ public static boolean isWeekend(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.setFirstDayOfWeek(Calendar.MONDAY); int week = calendar.get(Calendar.DAY_OF_WEEK); //SUNDAY is 1,SATURDAY is 7. //if (week == 1 || week == 7) if (week == Calendar.SATURDAY || week == Calendar.SUNDAY) { return true; } else { return false; } } /** * 一天的开始 * * @param date * @return */ public static Date getStartOfDate(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); calendar.set(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DAY_OF_MONTH), 0, 0, 0); return calendar.getTime(); } /** * 判断日期是星期几 2:星期一；3：星期二...7:星期六;1:星期天 */ public static int getWeekday(Date date) { Calendar calendar = Calendar.getInstance(); calendar.setTime(date); int weekday = calendar.get(Calendar.DAY_OF_WEEK); return weekday; } /** * 判断日期是否在某一时间段内，包含起始天 * * @param start * @param end * @param target * @return 存在返回true */ public static boolean judge(Date start, Date end, Date target) { if (target.before(start)) { return false; } if (target.after(end)) { return false; } return true; } public static Date addSecond(Date date, int amount) { Calendar c = Calendar.getInstance(); c.setTime(date); c.add(Calendar.SECOND, amount); return c.getTime(); }} 下面是一些简单的测试输出
import java.util.Date;/** * time utility test * @author */public class DateUtilTest { public static void main(String[] args) { //System.out.println("："+DateUtil); System.out.println("当前日期所在周的第一天的日期是："+DateUtil.convertDateTimeToString(DateUtil.getFirstDayOfWeek(new Date()))); System.out.println("当前日期所在周的最后一天的日期是："+DateUtil.convertDateTimeToString(DateUtil.getLastDayOfWeek(new Date()))); System.out.println("明年这个月的最后一天："+DateUtil.getMonthLastDay(DateUtil.getAfterYearTime())); System.out.println("根据年月获取当月的最后一天："+DateUtil.getMonthLastDay(2008, 2)); System.out.println("根据年月获取当月的最后一天："+DateUtil.getMonthLastDay(2009, 2)); System.out.println("今天"+((DateUtil.isWeekend(new Date())==true)?"是":"不是")+"周末."); }} 
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