时间工具类

import java.text.ParsePosition;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.regex.Pattern;public class DateUtil {// 格式：年－月－日 小时：分钟：秒public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";// 格式：年－月－日 小时：分钟public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";// 格式：年月日 小时分钟秒public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";// 格式：年－月－日public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";// 格式：月－日public static final String SHORT_DATE_FORMAT = "MM-dd";// 格式：小时：分钟：秒public static final String LONG_TIME_FORMAT = "HH:mm:ss";// 格式：年-月public static final String MONTG_DATE_FORMAT = "yyyy-MM";// 年的加减public static final int SUB_YEAR = Calendar.YEAR;// 月加减public static final int SUB_MONTH = Calendar.MONTH;// 天的加减public static final int SUB_DAY = Calendar.DATE;// 小时的加减public static final int SUB_HOUR = Calendar.HOUR;// 分钟的加减public static final int SUB_MINUTE = Calendar.MINUTE;// 秒的加减public static final int SUB_SECOND = Calendar.SECOND;static final String dayNames[] = { "星期日", "星期一", "星期二", "星期三", "星期四","星期五", "星期六" };@SuppressWarnings("unused")private static final SimpleDateFormat timeFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");public DateUtil() {}/** * 把符合日期格式的字符串转换为日期类型 *  * @param dateStr * @return */public static java.util.Date stringtoDate(String dateStr, String format) {Date d = null;SimpleDateFormat formater = new SimpleDateFormat(format);try {formater.setLenient(false);d = formater.parse(dateStr);} catch (Exception e) {// log.error(e);d = null;}return d;}/** * 把符合日期格式的字符串转换为日期类型 */public static java.util.Date stringtoDate(String dateStr, String format,ParsePosition pos) {Date d = null;SimpleDateFormat formater = new SimpleDateFormat(format);try {formater.setLenient(false);d = formater.parse(dateStr, pos);} catch (Exception e) {d = null;}return d;}/** * 把日期转换为字符串 *  * @param date * @return */public static String dateToString(java.util.Date date, String format) {String result = "";SimpleDateFormat formater = new SimpleDateFormat(format);try {result = formater.format(date);} catch (Exception e) {// log.error(e);}return result;}/** * 获取当前时间的指定格式 *  * @param format * @return */public static String getCurrDate(String format) {return dateToString(new Date(), format);}/** *  * @param dateStr * @param amount * @return */public static String dateSub(int dateKind, String dateStr, int amount) {Date date = stringtoDate(dateStr, FORMAT_ONE);Calendar calendar = Calendar.getInstance();calendar.setTime(date);calendar.add(dateKind, amount);return dateToString(calendar.getTime(), FORMAT_ONE);}/** * 两个日期相减 *  * @param firstTime * @param secTime * @return 相减得到的秒数 */public static long timeSub(String firstTime, String secTime) {long first = stringtoDate(firstTime, FORMAT_ONE).getTime();long second = stringtoDate(secTime, FORMAT_ONE).getTime();return (second - first) / 1000;}/** * 获得某月的天数 *  * @param year *            int * @param month *            int * @return int */public static int getDaysOfMonth(String year, String month) {int days = 0;if (month.equals("1") || month.equals("3") || month.equals("5")|| month.equals("7") || month.equals("8") || month.equals("10")|| month.equals("12")) {days = 31;} else if (month.equals("4") || month.equals("6") || month.equals("9")|| month.equals("11")) {days = 30;} else {if ((Integer.parseInt(year) % 4 == 0 && Integer.parseInt(year) % 100 != 0)|| Integer.parseInt(year) % 400 == 0) {days = 29;} else {days = 28;}}return days;}/** * 获取某年某月的天数 *  * @param year *            int * @param month *            int 月份[1-12] * @return int */public static int getDaysOfMonth(int year, int month) {Calendar calendar = Calendar.getInstance();calendar.set(year, month - 1, 1);return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);}/** * 获得当前日期 *  * @return int */public static int getToday() {Calendar calendar = Calendar.getInstance();return calendar.get(Calendar.DATE);}/** * 获得当前月份 *  * @return int */public static int getToMonth() {Calendar calendar = Calendar.getInstance();return calendar.get(Calendar.MONTH) + 1;}/** * 获得当前年份 *  * @return int */public static int getToYear() {Calendar calendar = Calendar.getInstance();return calendar.get(Calendar.YEAR);}/** * 返回日期的天 *  * @param date *            Date * @return int */public static int getDay(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.DATE);}/** * 返回日期的年 *  * @param date *            Date * @return int */public static int getYear(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.YEAR);}/** * 返回日期的月份，1-12 *  * @param date *            Date * @return int */public static int getMonth(Date date) {Calendar calendar = Calendar.getInstance();calendar.setTime(date);return calendar.get(Calendar.MONTH) + 1;}/** * 计算两个日期相差的天数，如果date2 > date1 返回正数，否则返回负数 *  * @param date1 *            Date * @param date2 *            Date * @return long */public static long dayDiff(Date date1, Date date2) {return (date2.getTime() - date1.getTime()) / 86400000;}/** * 比较两个日期的年差 *  * @param befor * @param after * @return */public static int yearDiff(String before, String after) {Date beforeDay = stringtoDate(before, LONG_DATE_FORMAT);Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);return getYear(afterDay) - getYear(beforeDay);}/** * 比较指定日期与当前日期的差 *  * @param befor * @param after * @return */public static int yearDiffCurr(String after) {Date beforeDay = new Date();Date afterDay = stringtoDate(after, LONG_DATE_FORMAT);return getYear(beforeDay) - getYear(afterDay);}/** * 比较指定日期与当前日期的差 *  * @param before * @return * @author chenyz */public static long dayDiffCurr(String before) {Date currDate = DateUtil.stringtoDate(currDay(), LONG_DATE_FORMAT);Date beforeDate = stringtoDate(before, LONG_DATE_FORMAT);return (currDate.getTime() - beforeDate.getTime()) / 86400000;}/** * 获取每月的第一周 *  * @param year * @param month * @return * @author chenyz */public static int getFirstWeekdayOfMonth(int year, int month) {Calendar c = Calendar.getInstance();c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天c.set(year, month - 1, 1);return c.get(Calendar.DAY_OF_WEEK);}/** * 获取每月的最后一周 *  * @param year * @param month * @return * @author chenyz */public static int getLastWeekdayOfMonth(int year, int month) {Calendar c = Calendar.getInstance();c.setFirstDayOfWeek(Calendar.SATURDAY); // 星期天为第一天c.set(year, month - 1, getDaysOfMonth(year, month));return c.get(Calendar.DAY_OF_WEEK);}/** * 获得当前日期字符串，格式"yyyy_MM_dd_HH_mm_ss" *  * @return *//*public static String getCurrent() {Calendar cal = Calendar.getInstance();cal.setTime(new Date());int year = cal.get(Calendar.YEAR);int month = cal.get(Calendar.MONTH) + 1;int day = cal.get(Calendar.DAY_OF_MONTH);int hour = cal.get(Calendar.HOUR_OF_DAY);int minute = cal.get(Calendar.MINUTE);int second = cal.get(Calendar.SECOND);StringBuffer sb = new StringBuffer();sb.append(year).append("_").append(StringUtil.addzero(month, 2)).append("_").append(StringUtil.addzero(day, 2)).append("_").append(StringUtil.addzero(hour, 2)).append("_").append(StringUtil.addzero(minute, 2)).append("_").append(StringUtil.addzero(second, 2));return sb.toString();}*//** * 获得当前日期字符串，格式"yyyy-MM-dd HH:mm:ss" *  * @return */public static String getNow() {Calendar today = Calendar.getInstance();return dateToString(today.getTime(), FORMAT_ONE);}/** * 根据生日获取星座 *  * @param birth *            YYYY-mm-dd * @return */public static String getAstro(String birth) {if (!isDate(birth)) {birth = "2000" + birth;}if (!isDate(birth)) {return "";}int month = Integer.parseInt(birth.substring(birth.indexOf("-") + 1,birth.lastIndexOf("-")));int day = Integer.parseInt(birth.substring(birth.lastIndexOf("-") + 1));String s = "魔羯水瓶双鱼牡羊金牛双子巨蟹狮子处女天秤天蝎射手魔羯";int[] arr = { 20, 19, 21, 21, 21, 22, 23, 23, 23, 23, 22, 22 };int start = month * 2 - (day < arr[month - 1] ? 2 : 0);return s.substring(start, start + 2) + "座";}/** * 判断日期是否有效,包括闰年的情况 *  * @param date *            YYYY-mm-dd * @return */public static boolean isDate(String date) {StringBuffer reg = new StringBuffer("^((\\d{2}(([02468][048])|([13579][26]))-?((((0?");reg.append("[13578])|(1[02]))-?((0?[1-9])|([1-2][0-9])|(3[01])))");reg.append("|(((0?[469])|(11))-?((0?[1-9])|([1-2][0-9])|(30)))|");reg.append("(0?2-?((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][12");reg.append("35679])|([13579][01345789]))-?((((0?[13578])|(1[02]))");reg.append("-?((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))");reg.append("-?((0?[1-9])|([1-2][0-9])|(30)))|(0?2-?((0?[");reg.append("1-9])|(1[0-9])|(2[0-8]))))))");Pattern p = Pattern.compile(reg.toString());return p.matcher(date).matches();}/** * 取得指定日期过 months 月后的日期 (当 months 为负数表示指定月之前); *  * @param date *            日期 为null时表示当天 * @param month *            相加(相减)的月数 */public static Date nextMonth(Date date, int months) {Calendar cal = Calendar.getInstance();if (date != null) {cal.setTime(date);}cal.add(Calendar.MONTH, months);return cal.getTime();}/** * 取得指定日期过 day 天后的日期 (当 day 为负数表示指日期之前); *  * @param date *            日期 为null时表示当天 * @param month *            相加(相减)的月数 */public static Date nextDay(Date date, int day) {Calendar cal = Calendar.getInstance();if (date != null) {cal.setTime(date);}cal.add(Calendar.DAY_OF_YEAR, day);return cal.getTime();}/** * 取得距离今天 day 日的日期 *  * @param day * @param format * @return * @author chenyz */public static String nextDay(int day, String format) {Calendar cal = Calendar.getInstance();cal.setTime(new Date());cal.add(Calendar.DAY_OF_YEAR, day);return dateToString(cal.getTime(), format);}/** * 取得指定日期过 day 周后的日期 (当 day 为负数表示指定月之前) *  * @param date *            日期 为null时表示当天 */public static Date nextWeek(Date date, int week) {Calendar cal = Calendar.getInstance();if (date != null) {cal.setTime(date);}cal.add(Calendar.WEEK_OF_MONTH, week);return cal.getTime();}/** * 获取当前的日期(yyyy-MM-dd) */public static String currDay() {return DateUtil.dateToString(new Date(), DateUtil.LONG_DATE_FORMAT);}/** * 获取昨天的日期 *  * @return */public static String befoDay() {return befoDay(DateUtil.LONG_DATE_FORMAT);}/** * 根据时间类型获取昨天的日期 *  * @param format * @return * @author chenyz */public static String befoDay(String format) {return DateUtil.dateToString(DateUtil.nextDay(new Date(), -1), format);}/** * 获取明天的日期 */public static String afterDay() {return DateUtil.dateToString(DateUtil.nextDay(new Date(), 1),DateUtil.LONG_DATE_FORMAT);}/** * 取得当前时间距离1900/1/1的天数 *  * @return */public static int getDayNum() {int daynum = 0;GregorianCalendar gd = new GregorianCalendar();Date dt = gd.getTime();GregorianCalendar gd1 = new GregorianCalendar(1900, 1, 1);Date dt1 = gd1.getTime();daynum = (int) ((dt.getTime() - dt1.getTime()) / (24 * 60 * 60 * 1000));return daynum;}/** * getDayNum的逆方法(用于处理Excel取出的日期格式数据等) *  * @param day * @return */public static Date getDateByNum(int day) {GregorianCalendar gd = new GregorianCalendar(1900, 1, 1);Date date = gd.getTime();date = nextDay(date, day);return date;}/** 针对yyyy-MM-dd HH:mm:ss格式,显示yyyymmdd */public static String getYmdDateCN(String datestr) {if (datestr == null)return "";if (datestr.length() < 10)return "";StringBuffer buf = new StringBuffer();buf.append(datestr.substring(0, 4)).append(datestr.substring(5, 7)).append(datestr.substring(8, 10));return buf.toString();}/** * 获取本月第一天 *  * @param format * @return */public static String getFirstDayOfMonth(String format) {Calendar cal = Calendar.getInstance();cal.set(Calendar.DATE, 1);return dateToString(cal.getTime(), format);}/** * 获取本月最后一天 *  * @param format * @return */public static String getLastDayOfMonth(String format) {Calendar cal = Calendar.getInstance();cal.set(Calendar.DATE, 1);cal.add(Calendar.MONTH, 1);cal.add(Calendar.DATE, -1);return dateToString(cal.getTime(), format);}}