日期的工具种，包含了字符串和日期之间转换的方法

日期的工具类，包含了字符串和日期之间转换的方法
import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.Locale;/** * 日期的工具类，包含了字符串和日期之间转换的方法 * @author &lt;a href="mailto:zhsj0110@163.com"&gt;zhoushijun&lt;/a&gt; * */public class DateUtil {/** * ORA标准时间格式 */private static final SimpleDateFormat ORA_DATE_TIME_FORMAT = new SimpleDateFormat("yyyyMMdd");/** * 带时分秒的ORA标准时间格式 */private static final SimpleDateFormat ORA_DATE_TIME_EXTENDED_FORMAT = new SimpleDateFormat("yyyyMMddHHmmss");private static final SimpleDateFormat ORA_DATE_TIME_FORMAT_CHINEASE = new SimpleDateFormat("yyyy年MM月dd日");private static final long ONE_DAY = 24 * 60 * 60 * 1000;private static final long ONE_HOUR = 60 * 60 * 1000;private static final long ONE_MIN = 60 * 1000;/** * 将两个格式为HH:MM:SS的时间字符串相加，例如：00:59:06 + 01:00:59 返回 02:00:05。 *  * @param time1 *            要累计的时间字符串 * @param time2 *            要累计的时间字符串 *  * @return 累计后的时间字符串 */public static String addTwoTimeStr(String time1, String time2) {String returnStr = "00:00:00";if (time1 != null && !time1.equalsIgnoreCase("") && time2 != null&& !time2.equalsIgnoreCase("")) {String[] time1Array = time1.split(":");String[] time2Array = time2.split(":");int hour1 = (new Integer(time1Array[0])).intValue();int hour2 = (new Integer(time2Array[0])).intValue();int min1 = (new Integer(time1Array[1])).intValue();int min2 = (new Integer(time2Array[1])).intValue();int sec1 = (new Integer(time1Array[2])).intValue();int sec2 = (new Integer(time2Array[2])).intValue();String lastSec, lastMin, lastHour;int totalSec = sec1 + sec2;if (totalSec / 60 &gt; 0) {// 超过1分钟的时间累计到min1中min1 = min1 + totalSec / 60;}if (totalSec % 60 &gt; 9) {lastSec = new Integer(totalSec % 60).toString();} else {lastSec = new String("0"+ new Integer(totalSec % 60).toString());}int totalMin = min1 + min2;if (totalMin / 60 &gt; 0) {// 超过1分钟的时间累计到hour1中hour1 = hour1 + totalMin / 60;}if (totalMin % 60 &gt; 9) {lastMin = new Integer(totalMin % 60).toString();} else {lastMin = new String("0"+ new Integer(totalMin % 60).toString());}int totalHour = hour1 + hour2;if (totalHour % 24 &gt; 9) {lastHour = new Integer(totalHour % 24).toString();} else {lastHour = new String("0"+ new Integer(totalHour % 24).toString());}returnStr = lastHour + ":" + lastMin + ":" + lastSec;} else if (time1 != null && !time1.equalsIgnoreCase("")) {returnStr = time1.substring(0, 8);} else if (time2 != null && !time2.equalsIgnoreCase("")) {returnStr = time2.substring(0, 8);} else {returnStr = "00:00:00";}return returnStr;}/** * 创建一个标准ORA时间格式的克隆 *  * @return 标准ORA时间格式的克隆 */@SuppressWarnings("unused")private static synchronized DateFormat getOraDateTimeFormat() {SimpleDateFormat theDateTimeFormat = (SimpleDateFormat) ORA_DATE_TIME_FORMAT.clone();theDateTimeFormat.setLenient(false);return theDateTimeFormat;}/** * 创建一个带分秒的ORA时间格式的克隆 *  * @return 标准ORA时间格式的克隆 */private static synchronized DateFormat getOraExtendDateTimeFormat() {SimpleDateFormat theDateTimeFormat = (SimpleDateFormat) ORA_DATE_TIME_EXTENDED_FORMAT.clone();theDateTimeFormat.setLenient(false);return theDateTimeFormat;}/** * @return 返回 oRA_DATE_TIME_FORMAT_CHINEASE。 */private static synchronized SimpleDateFormat getOraChineaseDateTimeFormat() {SimpleDateFormat theDateTimeFormat = (SimpleDateFormat) ORA_DATE_TIME_FORMAT_CHINEASE.clone();theDateTimeFormat.setLenient(false);return theDateTimeFormat;}/** * 得到系统当前的日期 格式为YYYY-MM-DD *  * @return 系统当前的日期 格式为YYYY-MM-DD */public static String getSystemCurrentDate() {Calendar calendar = Calendar.getInstance();calendar.setTimeInMillis(System.currentTimeMillis());return doTransform(calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH) + 1, calendar.get(Calendar.DAY_OF_MONTH));}/** * 返回格式为YYYY-MM-DD *  * @param year *            年 * @param month *            月 * @param day *            日 * @return */private static String doTransform(int year, int month, int day) {StringBuffer result = new StringBuffer();result.append(String.valueOf(year)).append("-").append(month &lt; 10 ? "0" + String.valueOf(month) : String.valueOf(month)).append("-").append(day &lt; 10 ? "0" + String.valueOf(day) : String.valueOf(day));return result.toString();}/** * 得到系统当前的日期和时间 格式为YYYY-MM-DD hh:mm:ss *  * @return 格式为YYYY-MM-DD hh:mm:ss的系统当前的日期和时间 */public static final String getSystemCurrentDateTime() {Calendar newCalendar = Calendar.getInstance();newCalendar.setTimeInMillis(System.currentTimeMillis());int year = newCalendar.get(Calendar.YEAR);int month = newCalendar.get(Calendar.MONTH) + 1;int day = newCalendar.get(Calendar.DAY_OF_MONTH);int hour = newCalendar.get(Calendar.HOUR_OF_DAY);int minute = newCalendar.get(Calendar.MINUTE);int second = newCalendar.get(Calendar.SECOND);return doTransform(year, month, day, hour, minute, second);}public static final String getSimpleSystemCurrentDateTime() {Calendar newCalendar = Calendar.getInstance();newCalendar.setTimeInMillis(System.currentTimeMillis());return toString(newCalendar.getTime(), getOraDateTimeFormat());}/** * 得到当前系统日期 格式为yyyy年mm月dd日 *  * @return */public static final String getChineaseDate() {Calendar newCalendar = Calendar.getInstance();newCalendar.setTimeInMillis(System.currentTimeMillis());return toString(newCalendar.getTime(), getOraChineaseDateTimeFormat());}/** * 得到系统当前的时间 格式为hh:mm:ss *  * @return 格式为hh:mm:ss的系统当前时间 */public static final String getSystemCurrentTime() {return getSystemCurrentDateTime().substring(11, 19);}/** * 返回格式为YYYY-MM-DD hh:mm:ss *  * @param year *            年 * @param month *            月 * @param day *            日 * @param hour *            小时 * @param minute *            分钟 * @param second *            秒 * @return */private static final String doTransform(int year, int month, int day,int hour, int minute, int second) {StringBuffer result = new StringBuffer();result.append(String.valueOf(year)).append("-").append(month &lt; 10 ? "0" + String.valueOf(month) : String.valueOf(month)).append("-").append(day &lt; 10 ? "0" + String.valueOf(day) : String.valueOf(day)).append(" ").append(hour &lt; 10 ? "0" + String.valueOf(hour) : String.valueOf(hour)).append(":").append(minute &lt; 10 ? "0" + String.valueOf(minute) : String.valueOf(minute)).append(":").append(second &lt; 10 ? "0" + String.valueOf(second) : String.valueOf(second));return result.toString();}/** * 获得昨天的日期 *  * @return 指定日期的上一天 格式:YYYY-MM-DD */public static synchronized String getDayBeforeToday() {Date date = new Date(System.currentTimeMillis());GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);gc.add(Calendar.DATE, -1);return doTransform(toString(gc.getTime(), getOraExtendDateTimeFormat())).substring(0, 10);}/** * 获得指定日期的上一天的日期 *  * @param dateStr *            指定的日期 格式:YYYY-MM-DD *  * @return 指定日期的上一天 格式:YYYY-MM-DD */public static synchronized String getDayBeforeToday(String dateStr) {Date date = toDayStartDate(dateStr);GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);gc.add(Calendar.DATE, -1);return doTransform(toString(gc.getTime(), getOraExtendDateTimeFormat())).substring(0, 10);}/** * 获得明天的日期 *  * @return 指定日期的下一天 格式:YYYY-MM-DD */public static synchronized String getDayAfterToday() {Date date = new Date(System.currentTimeMillis());GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);gc.add(Calendar.DATE, 1);return doTransform(toString(gc.getTime(), getOraExtendDateTimeFormat())).substring(0, 10);}/** * 获得指定日期的下一天的日期 *  * @param dateStr *            指定的日期 格式:YYYY-MM-DD *  * @return 指定日期的下一天 格式:YYYY-MM-DD */public static synchronized String getDayAfterToday(String dateStr) {Date date = toDayStartDate(dateStr);GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);gc.add(Calendar.DATE, 1);return doTransform(toString(gc.getTime(), getOraExtendDateTimeFormat())).substring(0, 10);}/** * 获得以后几个月的日期 *  * @return 指定日期的后面几个月 格式:YYYY-MM-DD */public static synchronized Date getDayAfterMonth(int months) {Date date = new Date(System.currentTimeMillis());GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);gc.add(Calendar.MONTH, months);return gc.getTime();}/** * 返回格式为YYYY-MM-DD hh:mm:ss *  * @param date *            输入格式为ORA标准时间格式 * @return */private static String doTransform(String date) {StringBuffer buffer = new StringBuffer();buffer.append(date.substring(0, 4));buffer.append("-");buffer.append(date.substring(4, 6));buffer.append("-");buffer.append(date.substring(6, 8));buffer.append(" ");buffer.append(date.substring(8, 10));buffer.append(":");buffer.append(date.substring(10, 12));buffer.append(":");buffer.append(date.substring(12, 14));return buffer.toString();}/** * 将一个日期对象转换成为指定日期、时间格式的字符串。 如果日期对象为空，返回一个空字符串对象. *  * @param theDate *            要转换的日期对象 * @param theDateFormat *            返回的日期字符串的格式 * @return 转换结果 */public static synchronized String toString(Date theDate,DateFormat theDateFormat) {if (theDate == null) {return "";} else {return theDateFormat.format(theDate);}}/** * 将Date类型转换后返回本系统默认的日期格式 YYYY-MM-DD hh:mm:ss *  * @param theDate *            要转换的Date对象 * @return 转换后的字符串 */public static synchronized String toDefaultString(Date theDate) {if (theDate == null) {return "";}return doTransform(toString(theDate, getOraExtendDateTimeFormat()));}/** * 将输入格式为2004-8-13 12:31:22类型的字符串转换为标准的Date类型 *  * @param dateStr *            要转换的字符串 *  * @return 转化后的标准的Date类型 */public static synchronized Date toDate(String dateStr) {String[] list0 = dateStr.split(" ");String date = list0[0];String time = list0[1];String[] list1 = date.split("-");int year = new Integer(list1[0]).intValue();int month = new Integer(list1[1]).intValue();int day = new Integer(list1[2]).intValue();String[] list2 = time.split(":");int hour = new Integer(list2[0]).intValue();int min = new Integer(list2[1]).intValue();int second = new Integer(list2[2]).intValue();Calendar cale = Calendar.getInstance();cale.set(year, month - 1, day, hour, min, second);return cale.getTime();}/** * 将输入格式为2004-8-13,2004-10-8类型的字符串转换为标准的Date类型,这种Date类型 对应的日期格式为YYYY-MM-DD * 00:00:00,代表一天的开始时刻 *  * @param dateStr *            要转换的字符串 * @return 转换后的Date对象 */public static synchronized Date toDayStartDate(String dateStr) {String[] list = dateStr.split("-");int year = Integer.parseInt(list[0]);int month = Integer.parseInt(list[1]);int day = Integer.parseInt(list[2]);Calendar cale = Calendar.getInstance();cale.set(year, month - 1, day, 0, 0, 0);return cale.getTime();}/** * 将输入格式为2004-8-13,2004-10-8类型的字符串转换为标准的Date类型,这种Date类型 对应的日期格式为YYYY-MM-DD * 23:59:59,代表一天的结束时刻 *  * @param dateStr *            输入格式:2004-8-13,2004-10-8 * @return 转换后的Date对象 */public static synchronized Date toDayEndDate(String dateStr) {String[] list = dateStr.split("-");int year = new Integer(list[0]).intValue();int month = new Integer(list[1]).intValue();int day = new Integer(list[2]).intValue();Calendar cale = Calendar.getInstance();cale.set(year, month - 1, day, 23, 59, 59);return cale.getTime();}/** * 将两个scorm时间相加 *  * @param scormTime1 *            scorm时间,格式为00:00:00(1..2).0(1..3) * @param scormTime2 *            scorm时间,格式为00:00:00(1..2).0(1..3) * @return 两个scorm时间相加的结果 */public static synchronized String addTwoScormTime(String scormTime1,String scormTime2) {int dotIndex1 = scormTime1.indexOf(".");int hh1 = Integer.parseInt(scormTime1.substring(0, 2));int mm1 = Integer.parseInt(scormTime1.substring(3, 5));int ss1 = 0;if (dotIndex1 != -1) {ss1 = Integer.parseInt(scormTime1.substring(6, dotIndex1));} else {ss1 = Integer.parseInt(scormTime1.substring(6, scormTime1.length()));}int ms1 = 0;if (dotIndex1 != -1) {ms1 = Integer.parseInt(scormTime1.substring(dotIndex1 + 1,scormTime1.length()));}int dotIndex2 = scormTime2.indexOf(".");int hh2 = Integer.parseInt(scormTime2.substring(0, 2));int mm2 = Integer.parseInt(scormTime2.substring(3, 5));int ss2 = 0;if (dotIndex2 != -1) {ss2 = Integer.parseInt(scormTime2.substring(6, dotIndex2));} else {ss2 = Integer.parseInt(scormTime2.substring(6, scormTime2.length()));}int ms2 = 0;if (dotIndex2 != -1) {ms2 = Integer.parseInt(scormTime2.substring(dotIndex2 + 1,scormTime2.length()));}int hh = 0;int mm = 0;int ss = 0;int ms = 0;if (ms1 + ms2 &gt;= 1000) {ss = 1;ms = ms1 + ms2 - 1000;} else {ms = ms1 + ms2;}if (ss1 + ss2 + ss &gt;= 60) {mm = 1;ss = ss1 + ss2 + ss - 60;} else {ss = ss1 + ss2 + ss;}if (mm1 + mm2 + mm &gt;= 60) {hh = 1;mm = mm1 + mm2 + mm - 60;} else {mm = mm1 + mm2 + mm;}hh = hh + hh1 + hh2;StringBuffer sb = new StringBuffer();if (hh &lt; 10) {sb.append("0").append(hh);} else {sb.append(hh);}sb.append(":");if (mm &lt; 10) {sb.append("0").append(mm);} else {sb.append(mm);}sb.append(":");if (ss &lt; 10) {sb.append("0").append(ss);} else {sb.append(ss);}sb.append(".");if (ms &lt; 10) {sb.append(ms).append("00");} else if (ms &lt; 100) {sb.append(ms).append("0");} else {sb.append(ms);}return sb.toString();}/** * 根据timeType返回当前日期与传入日期的差值（当前日期减传入日期） 当要求返回月份的时候，date的日期必须和当前的日期相等， * 否则返回0（例如：2003-2-23 和 2004-6-12由于23号和12号不是同一天，固返回0， 2003-2-23 和 2005-6-23 * 则需计算相差的月份，包括年，此例应返回28（个月）。 2003-2-23 和 2001-6-23 * 也需计算相差的月份，包括年，此例应返回-20（个月）） *  * @param date *            要与当前日期比较的日期 * @param timeType *            0代表返回两个日期相差月数，1代表返回两个日期相差天数 *  * @return 根据timeType返回当前日期与传入日期的差值 */public static int CompareDateWithNow(Date date, int timeType) {Date now = Calendar.getInstance().getTime();Calendar calendarNow = Calendar.getInstance();calendarNow.setTime(now);calendarNow.set(Calendar.HOUR, 0);calendarNow.set(Calendar.MINUTE, 0);calendarNow.set(Calendar.SECOND, 0);Calendar calendarPara = Calendar.getInstance();calendarPara.setTime(date);calendarPara.set(Calendar.HOUR, 0);calendarPara.set(Calendar.MINUTE, 0);calendarPara.set(Calendar.SECOND, 0);float nowTime = now.getTime();float dateTime = date.getTime();if (timeType == 0) {if (calendarNow.get(Calendar.DAY_OF_YEAR) == calendarPara.get(Calendar.DAY_OF_YEAR))return 0;return (calendarNow.get(Calendar.YEAR) - calendarPara.get(Calendar.YEAR))* 12+ calendarNow.get(Calendar.MONTH)- calendarPara.get(Calendar.MONTH);} else {float result = nowTime - dateTime;float day = 24 * 60 * 60 * 1000;// System.out.println("day "+day);// result = (result &gt; 0) ? result : -result;// System.out.println(result);result = result / day;Float resultFloat = new Float(result);float fraction = result - resultFloat.intValue();if (fraction &gt; 0.5) {return resultFloat.intValue() + 1;} else if (fraction &lt; -0.5) {return resultFloat.intValue() - 1;} else {return resultFloat.intValue();}}}/** * 判断当前月份是否是最后12月 *  * @return 否是最后12月 */public static boolean isLastMonth() {if (month().equals("12"))return true;return false;}/** * 获得当前日期的年份 *  * @return 当前日期的年份 */public static Integer year() {Calendar calendar = Calendar.getInstance();return new Integer(calendar.get(Calendar.YEAR));}/** * 获得当前日期的月份 *  * @return 当前日期的月份 */public static Integer month() {Calendar calendar = Calendar.getInstance();return new Integer(calendar.get(Calendar.MONTH) + 1);}/** * 获得当前日期的前一个月份,如果当前是1月，返回12 *  * @return 当前日期的前一个月份 */public static Integer beforeMonth() {Calendar calendar = Calendar.getInstance();int month = calendar.get(Calendar.MONTH);if (month == 0) {return new Integer(12);} else {return new Integer(month);}}/** * 获得当前日期的后一个月份,如果当前是12月，返回1 *  * @return 当前日期的后一个月份 */public static Integer nextMonth() {Calendar calendar = Calendar.getInstance();int month = calendar.get(Calendar.MONTH);if (month == 11) {return new Integer(1);} else {return new Integer(month + 2);}}/** * 获得当前日期的日 *  * @return 当前日期的日 */public static Integer day() {Calendar calendar = Calendar.getInstance();return new Integer(calendar.get(Calendar.DAY_OF_MONTH));}/** * 获得当前时间的小时 *  * @return 当前时间的小时 */public static Integer hour() {Calendar calendar = Calendar.getInstance();return new Integer(calendar.get(Calendar.HOUR_OF_DAY));}/** * 获得当前时间的分钟 *  * @return 当前时间的分钟 */public static Integer minute() {Calendar calendar = Calendar.getInstance();return new Integer(calendar.get(Calendar.MINUTE));}/** * 获得当前时间的秒 *  * @return 当前时间的秒 */public static Integer second() {Calendar calendar = Calendar.getInstance();return new Integer(calendar.get(Calendar.SECOND));}/** * 获得当前的星期是本月的第几周 *  * @return 当前的星期是本月的第几周 */public static int WeekofMonth() {Calendar calendar = Calendar.getInstance();return calendar.get(Calendar.WEEK_OF_MONTH);}/** * 获得当前的日期是本星期的第几天 *  * @return 当前的日期是本星期的第几天 */public static int DayofWeek() {Calendar calendar = Calendar.getInstance();return calendar.get(Calendar.DAY_OF_WEEK) - 1;}/** * 获得这个月有几周 *  * @return 这个月有几周 */public static int getMaxWeekofMonth() {Calendar calendar = Calendar.getInstance();return calendar.getActualMaximum(Calendar.WEEK_OF_MONTH);}/** * 获得当前的星期是本月的第几周 *  * @return 当前的星期是本月的第几周 */public static int WeekofMonth(int year, int month, int day) {Calendar calendar = Calendar.getInstance();calendar.set(year, month - 1, day, 0, 0, 0);return calendar.get(Calendar.WEEK_OF_MONTH);}/** * 获得当前的日期是本星期的第几天 *  * @return 当前的日期是本星期的第几天 */public static int DayofWeek(int year, int month, int day) {Calendar calendar = Calendar.getInstance();calendar.set(year, month - 1, day, 0, 0, 0);return calendar.get(Calendar.DAY_OF_WEEK) - 1;}/** * 获得当前的日期是本星期的第几天 *  * @return 当前的日期是本星期的第几天 */public static int getTodayofWeek() {Calendar calendar = Calendar.getInstance();return calendar.get(Calendar.DAY_OF_WEEK) - 1;}/** * 获得这个月有几周 *  * @return 这个月有几周 */public static int getMaxWeekofMonth(int year, int month) {Calendar calendar = Calendar.getInstance();calendar.set(year, month - 1, 1, 0, 0, 0);return calendar.getActualMaximum(Calendar.WEEK_OF_MONTH);}/** * 得到当前日期的字符串，格式是YYYY-MM-DD *  * @return 当前日期的字符串，格式是YYYY-MM-DD */public static String Date() {Calendar calendar = Calendar.getInstance();StringBuffer date = new StringBuffer();date.append(calendar.get(Calendar.YEAR));date.append('-');date.append(calendar.get(Calendar.MONTH) + 1);date.append('-');date.append(calendar.get(Calendar.DAY_OF_MONTH));return date.toString();}/** * 得到当前日期时间的字符串，格式是YYYY-MM-DD HH:MM:SS *  * @return 当前日期时间的字符串，格式是YYYY-MM-DD HH:MM:SS */public static String DateTime() {Calendar calendar = Calendar.getInstance();StringBuffer date = new StringBuffer();date.append(calendar.get(Calendar.YEAR));date.append('-');date.append(calendar.get(Calendar.MONTH) + 1);date.append('-');date.append(calendar.get(Calendar.DAY_OF_MONTH));date.append(' ');date.append(calendar.get(Calendar.HOUR_OF_DAY));date.append(':');date.append(calendar.get(Calendar.MINUTE));date.append(':');date.append(calendar.get(Calendar.SECOND));return date.toString();}/** * 比较2个日期大小 *  * @param startTime *            起始日期 * @param endTime *            结束日期 * @return 比较2个日期大小。&gt;0：startTime&gt;endTime 0:startTime=endTime &lt;0:startTime&lt;endTime *  * @throws ParseException */public static int compareTwoDate(String startTime, String endTime)throws ParseException {SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date b = formatter.parse(startTime);Date c = formatter.parse(endTime);return b.compareTo(c);}/** * 比较一个日期是否在指定的日期段中 *  * @param nowSysDateTime *            要判断的日期 * @param startTime *            起始日期 * @param endTime *            结束日期 * @return nowSysDateTime在startTime和endTime中返回true * @throws ParseException */public static boolean compareThreeDate(String nowSysDateTime,String startTime, String endTime) throws ParseException {SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");Date b = formatter.parse(startTime);Date a = formatter.parse(nowSysDateTime);Date c = formatter.parse(endTime);if (a.compareTo(b) &gt;= 0 && a.compareTo(c) &lt;= 0) {return true;} else {return false;}}/** * 得到某一年的某月的前/后一个月是那一年 例如得到2002年1月的前一个月是哪年 (2002,1,-1) =2001. *  * @param year *            时间点的年份 * @param month *            时间点的月份 * @param pastMonth *            于时间点的月份距离,负数表示以前的时间,正数表示以后的时间 * @return 返回年 */public static int getYearPastMonth(int year, int month, int pastMonth) {return year+ (int) Math.floor((double) (month - 1 + pastMonth)/ (double) 12);}/** * 得到某个月的下几个个月是那个月. *  * @param month *            当前月 * @param pastMonth *            和当前月的月数差距 * @return 目标月数 */public static int getMonthPastMonth(int month, int pastMonth) {return ((12 + month - 1 + pastMonth) % 12) + 1;}/** * 返回月份的季度数. *  * 0表示非法月份.正常返回1,2,3,4. *  * @param nMonth *            int * @return int */public static int getQuarterbyMonth(int nMonth) {final int[] monthQuarters = { 0, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4 };if (nMonth &gt;= 0 && nMonth &lt;= 12) {return monthQuarters[nMonth];} else {return 0;}}/** * 得到当前日期. *  * @return 当前日期的java.sql.Date格式 */public static java.sql.Date getNowSqlDate() {java.util.Date aDate = new java.util.Date();return new java.sql.Date(aDate.getTime());}/** * 得到当前日期. *  * @return 当前日期的java.util.Date格式 */public static java.util.Date getNowDate() {return Calendar.getInstance().getTime();}/** * 得到当前时间. *  * @return java.sql.Time */public static java.sql.Timestamp getNowTimestamp() {return new java.sql.Timestamp(new java.util.Date().getTime());}/** * 得到某个时间的字符串显示,格式为yyyy-MM-dd HH:mm. *  * @param aTime *            要分析的时间 * @return String */public static String getTimeShow(java.sql.Timestamp aTime) {if (null == aTime) {return "";}SimpleDateFormat sdfTemp = new SimpleDateFormat("yyyy-MM-dd HH:mm",Locale.US);return sdfTemp.format(aTime);}/** * 按照自己的格式显示时间. *  * @param aTime *            要分析的时间 * @param aFormat *            按照SimpleDateFormat的规则的格式 * @return 字符串 */public static String getSelfTimeShow(java.sql.Timestamp aTime,String aFormat) {if (null == aTime) {return "";}SimpleDateFormat sdfTemp = new SimpleDateFormat(aFormat, Locale.US);return sdfTemp.format(aTime);}/** * 按照自己的格式显示时间. *  * @param aTime *            要分析的时间 * @param aFormat *            按照SimpleDateFormat的规则的格式 * @return 字符串 */public static String getSelfTimeShow(java.sql.Date aTime, String aFormat) {if (null == aTime) {return "";}SimpleDateFormat sdfTemp = new SimpleDateFormat(aFormat, Locale.US);return sdfTemp.format(aTime);}/** * 查询某个月的天数. *  * @param year *            年 * @param month *            月 * @return 月的天数 */public static int getDayinMonth(int year, int month) {final int[] dayNumbers = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30,31 };int result;if ((month == 2) && ((year % 4) == 0) && ((year % 100) != 0)|| ((year % 400) == 0)) {result = 29;} else {result = dayNumbers[month - 1];}return result;}/** * 检查日期是否合法. *  * @param ayear *            年 * @param amonth *            月 * @param aday *            日 * @return 合法返回0,非法返回-1,空返回1 */public static int validDate(int ayear, int amonth, int aday) {int isGood = 0;if ((ayear == 0) || (amonth == 0) || (aday == 0)) {isGood = 1;} else {int monthDays = getDayinMonth(ayear, amonth);if ((aday &lt; 1) || (aday &gt; monthDays)) {isGood = -1;}}return isGood;}/** * 检查日期是否合法. *  * @param syear *            年 * @param smonth *            月 * @param sday *            日 * @return 合法返回0,非法返回-1,空返回1 */public static int validDate(String syear, String smonth, String sday) {int ayear, amonth, aday;ayear = StringUtil.myparseInt(syear, 0);amonth = StringUtil.myparseInt(smonth, 0);aday = StringUtil.myparseInt(sday, 0);return validDate(ayear, amonth, aday);}/** * 检查一个日期字符串是否合法: 2003-9-5. *  * @param aDateStr *            日期字符串 * @return 合法返回0,非法返回-1,空返回1 */public static int validDate(String aDateStr) {if (StringUtil.isTrimEmpty(aDateStr)) {return 1;}String[] aObj = StringUtil.splitString("/-/", aDateStr);if (null == aObj) {return 1;}return validDate(aObj[0], aObj[1], aObj[2]);}/** * 检测时间的合法性. *  * @param nHour *            int * @param nMin *            int * @param nSec *            int * @return int 合法返回0,非法返回-1,空返回1 */public static int validTime(int nHour, int nMin, int nSec) {int isGood = 0; // normalif ((nHour == 0) || (nMin == 0) || (nSec == 0)) {isGood = 1; // empty} else {if ((nHour &gt; 23 || nHour &lt; 0 || nMin &gt; 59 || nMin &lt; 0 || nSec &gt; 59 || nSec &lt; 0)) {isGood = -1; // invalid}}return isGood;}/** * 检查一个日期字符串是否合法: 2003-9-5 13:52:5. *  * @param aDateTimeStr *            日期字符串 * @return 合法返回0,非法返回-1,空返回1 */public static int validDateTime(String aDateTimeStr) {if (StringUtil.isTrimEmpty(aDateTimeStr)) {return 1;}String[] aObj = StringUtil.splitString("/ /", aDateTimeStr);if (null == aObj) {return 1;}if (aObj.length != 2) {return 1;}if (validDate(aObj[0]) == 0) {String[] aTimeObj = StringUtil.splitString("/:/", aObj[1]);if (aTimeObj.length == 3) {int nHour = StringUtil.myparseInt(aTimeObj[0], 0);int nMin = StringUtil.myparseInt(aTimeObj[0], 0);int nSec = StringUtil.myparseInt(aTimeObj[0], 0);return validTime(nHour, nMin, nSec);}}return -1;}/** * 检查日期是否为空. *  * @param syear *            年 * @param smonth *            月 * @param sday *            日 * @return 为空返回true */public static boolean isEmptyDate(String syear, String smonth, String sday) {boolean isEmpty = false;int ayear, amonth, aday;ayear = StringUtil.myparseInt(syear, 0);amonth = StringUtil.myparseInt(smonth, 0);aday = StringUtil.myparseInt(sday, 0);if ((ayear == 0) || (amonth == 0) || (aday == 0)) {isEmpty = true;}return isEmpty;}/** * 检查日期是否为空. *  * @param ayear *            年 * @param amonth *            月 * @param aday *            日 * @return 为空返回true */public static boolean isEmptyDate(int ayear, int amonth, int aday) {boolean isEmpty = false;if ((ayear == 0) || (amonth == 0) || (aday == 0)) {isEmpty = true;}return isEmpty;}/** * 得到现在时间的前/后一段时间. *  * @param nSecs *            距离现在时间的秒数 * @return Timestamp */public static java.sql.Timestamp getPastTime(int nSecs) {java.sql.Timestamp ts1 = getNowTimestamp();java.sql.Timestamp ts2;ts2 = new java.sql.Timestamp(ts1.getTime() - nSecs * 1000);return ts2;}/** * 得到距离某个时间一段时间的一个时间. *  * @param aTime *            相对的时间 * @param nSecs *            时间距离:秒 * @return Timestamp */public static java.sql.Timestamp getPastTime(java.sql.Timestamp aTime,int nSecs) {java.sql.Timestamp ts2;ts2 = new java.sql.Timestamp(aTime.getTime() - nSecs * 1000);return ts2;}/** * 检查aDate是不是今天. *  * @param aDate *            分析的日期 * @return 是今天返回true */public static boolean isToday(java.sql.Date aDate) {Calendar aCal1 = Calendar.getInstance();aCal1.setTime(aDate);java.sql.Date date1 = getNowSqlDate();Calendar aCal2 = Calendar.getInstance();aCal2.setTime(date1);return ((aCal1.get(Calendar.DATE) == aCal2.get(Calendar.DATE))&& (aCal1.get(Calendar.YEAR) == aCal2.get(Calendar.YEAR)) && (aCal1.get(Calendar.MONTH) == aCal2.get(Calendar.MONTH)));}/** * 把字符串按照规则转换为日期时间的long值. *  * 如果不合法,则返回今天. *  * @param str *            要分析的字符串 * @param pattern *            规则 * @throws NullPointerException * @return long */public static Long str2DateTime(String str, String pattern) {DateFormat dateFmt = new SimpleDateFormat(pattern, Locale.US);Calendar calendar = Calendar.getInstance();try {calendar.setTime(dateFmt.parse(str));// return c.getTimeInMillis();return new Long(calendar.getTime().getTime());} catch (Exception e) {SystemUtil.printLine(e.toString());// return nullreturn null;}}/** * 从一个日期字符串得到时间的long值. *  * @param strTemp *            String * @return long */public static Long dateStr2Time(String strTemp) {if (null == strTemp || strTemp.length() &lt; 8) {return null;}String sSign = strTemp.substring(4, 5);String sPattern = new StringBuffer("yyyy").append(sSign).append("MM").append(sSign).append("dd").toString();return str2DateTime(strTemp, sPattern);}/** * 从一个日期时间字符串得到时间的long值. 例如 2004-5-6 23:52:22 ,包含秒 *  * @param strTemp *            String * @return long */public static Long dateTimeStr2Time(String strTemp) {if (null == strTemp || strTemp.length() &lt; 8) {return null;}String sSign = strTemp.substring(4, 5);String sPattern = new StringBuffer("yyyy").append(sSign).append("MM").append(sSign).append("dd").append(" hh:mm:ss").toString();Long aLong = str2DateTime(strTemp, sPattern);if (null == aLong) {String sShortPattern = new StringBuffer("yyyy").append(sSign).append("MM").append(sSign).append("dd").append(" hh:mm").toString();aLong = str2DateTime(strTemp, sShortPattern);}return aLong;}/** * 把2003-10-11这种字符串转换为时间格式,如果不合法,返回的是当前时间. *  * @param aStr *            要分析的字符串,格式为2003-11-11 * @return Timestamp */public static java.sql.Timestamp dateStr2Timestamp(String aStr) {Long temp = dateStr2Time(aStr);if (null == temp) {return null;}return new java.sql.Timestamp(temp.longValue());}/** * 把2003-10-11这种字符串转换为时间格式,如果不合法,返回的是当前时间. *  * @param aStr *            要分析的字符串,格式为2003-11-11 * @return Date */public static java.util.Date dateStr2Date(String aStr) {Long result = dateStr2Time(aStr);if (null == result) {return null;}return new java.sql.Date(result.longValue());/* * //version 1 for check 2004.6.26 by scud *  * Calendar aSJ = Calendar.getInstance(); aSJ.setTime(new * java.util.Date()); if (StrFunc.calcCharCount('-', aStr) &gt;= 2) { int * aYear, aMonth, aDay; String[] aObj = StrFunc.splitString("/-/", * aStr); aYear = StrFunc.myparseInt(aObj[0]); aMonth = * StrFunc.myparseInt(aObj[1]) - 1; aDay = StrFunc.myparseInt(aObj[2]); * if (aYear &gt; 0 && aMonth &gt; -1 && aDay &gt; -1) { aSJ.set(aYear, aMonth, * aDay); } } return new java.sql.Date(aSJ.getTime().getTime()); */}/** * 把2003-10-11 23:43:55这种字符串转换为时间格式,如果不合法,返回的是当前时间. *  * @param aStr *            要分析的字符串 * @return Timestamp */public static java.sql.Timestamp dateTimeStr2Timestamp(String aStr) {Long tempVar = dateTimeStr2Time(aStr);if (null == tempVar) {return null;}return new java.sql.Timestamp(tempVar.longValue());}/** * 日期字符串转换为日期范围的开始时间,即从该天的0:0:0开始. 如果该数据库类型就是日期类型,则直接getFormDate即可. *  * @param aStr *            String * @return Timestamp */public static java.sql.Timestamp dateStr2BeginDateTime(String aStr) {if (StringUtil.isTrimEmpty(aStr)) {return null;} else {return dateTimeStr2Timestamp(aStr + " 0:0:0");}}/** * 日期字符串转换为日期范围的结束时间,即到该天的23:59:59. 如果该数据库类型就是日期类型,则直接getFormDate即可. *  * @param aStr *            String * @return Timestamp */public static java.sql.Timestamp dateStr2EndDateTime(String aStr) {if (StringUtil.isTrimEmpty(aStr)) {return null;} else {return dateTimeStr2Timestamp(aStr + " 23:59:59");}}/** * 得到日期中的年. *  * @param aDate *            要分析的日期 * @return 年 */public static int getYearFromDate(java.util.Date aDate) {Calendar cFF = Calendar.getInstance();cFF.setTime(aDate);return cFF.get(Calendar.YEAR);}/** * 得到日期中的月. *  * @param aDate *            要分析的日期 * @return 月 */public static int getMonthFromDate(java.util.Date aDate) {Calendar cFF = Calendar.getInstance();cFF.setTime(aDate);return cFF.get(Calendar.MONTH) + 1;}/** * 得到日期中的天. *  * @param aDate *            要分析的日期 * @return 天 */public static int getDAYFromDate(java.util.Date aDate) {Calendar cFF = Calendar.getInstance();cFF.setTime(aDate);return cFF.get(Calendar.DATE);}/** * 得到日期中的小时. *  * @param aDate *            要分析的日期 * @return 小时 */public static int getHourFromDate(java.util.Date aDate) {Calendar cFF = Calendar.getInstance();cFF.setTime(aDate);return cFF.get(Calendar.HOUR_OF_DAY);}/** * 得到日期中的分钟. *  * @param aDate *            要分析的日期 * @return 分钟 */public static int getMinuteFromDate(java.util.Date aDate) {Calendar cFF = Calendar.getInstance();cFF.setTime(aDate);return cFF.get(Calendar.MINUTE);}/** * 得到日期的星期. *  * @param aDate *            要分析的日期 * @return 星期 */public static int getWeekFromDate(java.util.Date aDate) {Calendar cFF = Calendar.getInstance();cFF.setTime(aDate);return cFF.get(Calendar.DAY_OF_WEEK);}/** * 得到当前月的第一天是日期几. *  * @param year *            要分析的年份 * @param month *            要分析的月份 * @return 星期 */public static int getFirstDayOfWeek(Integer year, Integer month) {Calendar cFF = Calendar.getInstance();cFF.set(Calendar.YEAR, year);cFF.set(Calendar.MONTH, month - 1);cFF.set(Calendar.DATE, 1);return cFF.get(Calendar.DAY_OF_WEEK) - 1;}/** * 获得当前时间与给定时间的距离 *  * @param compMillSecond *            给定时间的与协调世界时 1970 年 1 月 1 日午夜之间的时间差 * @return 例如:367Day 59H 56Min */public static String diff(long compMillSecond) {long diff = System.currentTimeMillis() - compMillSecond;long day = diff / ONE_DAY;long hour = (diff % ONE_DAY) / ONE_HOUR;long min = ((diff % ONE_DAY) % ONE_HOUR) / ONE_MIN;return String.valueOf(day) + " Days " + String.valueOf(hour)+ " Hours " + String.valueOf(min) + " Mins ";}/** * 得到间隔时间的天数 *  * @param overdate * @return */public static String getIntevalDays(Date overdate) {String temp = null;@SuppressWarnings("unused")SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");Date nowdate = new Date();long nowlong = nowdate.getTime();long overlong = overdate.getTime();long templong = overlong - nowlong;long day = templong / 1000 / 60 / 60 / 24;temp = String.valueOf(day);if (overdate.getTime() &lt; nowdate.getTime()) {return "-1";}return temp;}/** * 计算2个日期相隔多少天 *  * @param beforeDate *            起始日期 *  * @param afterDate *            结束日期 *  * @return 相差多少天 * @throws ParseException  */public static Integer getIntevalDays(Date beforeDate, Date afterDate){SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");String beforeString = dateFormat.format(beforeDate);String afterString = dateFormat.format(afterDate);beforeString = beforeString + " 00:00:00";afterString = afterString + " 00:00:00";Integer temp = -1;long beforeLong = 0;long afterLong = 0;try {beforeLong = dateFormat.parse(beforeString).getTime();afterLong = dateFormat.parse(afterString).getTime();} catch (ParseException e) {e.printStackTrace();}if (beforeLong &lt; afterLong) {long templong = afterLong / 1000 / 60 / 60 / 24  - beforeLong / 1000 / 60 / 60 / 24;temp = Integer.valueOf(String.valueOf(templong));}return temp;}/** * 得到间隔时间的分钟数 *  * @param overdate * @return */public static String getIntevalMinutes(Date overdate) {String temp = null;@SuppressWarnings("unused")SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");Date nowdate = new Date();long nowlong = nowdate.getTime();long overlong = overdate.getTime();long templong = overlong - nowlong;long hour = templong / 1000 / 60 / 60;templong = templong - hour * 60 * 60 * 1000;long minute = templong / 1000 / 60;temp = String.valueOf(minute);if (overdate.getTime() &lt; nowdate.getTime()) {return "-1";}return temp;}/** * 获得给定日期的后几天的日期 *  * @param date *            给定的日期 * @param days *            过几天的天数 * @return 返回给定日期后几天的日期 */public static synchronized Date getDayAfterDate(Date date, int days) {GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();gc.setTime(date);gc.add(Calendar.DAY_OF_YEAR, days);return gc.getTime();}public static void main(String[] args) {//Calendar calendar = Calendar.getInstance();//calendar.// GregorianCalendar gc = (GregorianCalendar) Calendar.getInstance();//// gc.set(2008, 04, 20);//@SuppressWarnings("unused")System.out.println(getIntevalDays(toDate("2010-01-13 23:59:59"),toDate("2010-01-14 00:00:00")));}/** * 得到二个日期间的间隔小时 */public static Long getTwoDay(String sj1, String sj2) {SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");long day = 0;try {java.util.Date date = myFormatter.parse(sj1);java.util.Date mydate = myFormatter.parse(sj2);day = (date.getTime() - mydate.getTime()) / ( 60 * 60 * 1000);} catch (Exception e) {e.printStackTrace();}return day;}/** * 得到二个日期间的间隔分钟数 */public static Long getTwoMinute(String sj1, String sj2) {SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");long day = 0;try {java.util.Date date = myFormatter.parse(sj1);java.util.Date mydate = myFormatter.parse(sj2);day = (date.getTime() - mydate.getTime()) / (60 * 1000);} catch (Exception e) {e.printStackTrace();}return day;}/** * 把日期转换为字符串, *  * @param date *            要转换的日期,如果date时间参数为null,默认取当前时间； * @param par *            日期格式,如果参数为null，默认取"yyyy-MM-dd HH:mm:ss" * @return 转换后的字符串 * @author zhoushijun * @since 2009-11-9 */public static String dateToString(Date date, String par) {String string = "";if (date == null) {Calendar cal = Calendar.getInstance();date = cal.getTime();}if (par == null)par = "yyyy-MM-dd HH:mm:ss";SimpleDateFormat dateformat = new SimpleDateFormat(par);string = dateformat.format(date);return string;}public static Date strToDate(String date, String formatStr) {SimpleDateFormat dateformat = new SimpleDateFormat(formatStr);try {return dateformat.parse(date);} catch (ParseException e) {e.printStackTrace();}return null;}}
日期的工具种包含了字符串和日期之间

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