时间操作工具类代码,Java代码库,德仔网

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【Java】时间操作工具类
作者:疯狂的流浪 / 发布于2011/1/10/ 747
<div>package com.***.product.util;</div>
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;</div>
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;</div>
<div>
public class DateUtil {
 protected static Log logger = LogFactory.getLog(DateUtil.class);</div>
<div> // 格式：年－月－日 小时：分钟：秒
 public static final String FORMAT_ONE = "yyyy-MM-dd HH:mm:ss";</div>
<div> // 格式：年－月－日 小时：分钟
 public static final String FORMAT_TWO = "yyyy-MM-dd HH:mm";</div>
<div> // 格式：年月日 小时分钟秒
 public static final String FORMAT_THREE = "yyyyMMdd-HHmmss";</div>
<div> // 格式：年－月－日
 public static final String LONG_DATE_FORMAT = "yyyy-MM-dd";</div>
<div> // 格式：月－日
 public static final String SHORT_DATE_FORMAT = "MM-dd";</div>
<div> // 格式：小时：分钟：秒
 public static final String LONG_TIME_FORMAT = "HH:mm:ss";</div>
<div> //格式：年-月
 public static final String MONTG_DATE_FORMAT = "yyyy-MM";</div>
<div> // 年的加减
 public static final int SUB_YEAR = Calendar.YEAR;</div>
<div> // 月加减
 public static final int SUB_MONTH = Calendar.MONTH;</div>
<div> // 天的加减
 public static final int SUB_DAY = Calendar.DATE;</div>
<div> // 小时的加减
 public static final int SUB_HOUR = Calendar.HOUR;</div>
<div> // 分钟的加减
 public static final int SUB_MINUTE = Calendar.MINUTE;</div>
<div> // 秒的加减
 public static final int SUB_SECOND = Calendar.SECOND;</div>
<div> 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" };</div>
<div> @SuppressWarnings("unused")
 private static final SimpleDateFormat timeFormat = new SimpleDateFormat(
 "yyyy-MM-dd HH:mm:ss");</div>
<div> public DateUtil() {
 }
<div> /**
 * 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;
 }
<div> /**
 * 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;
 }
<div> /**
 * 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;
 }
<div> /**
 * 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);
 }
<div> /**
 * 
 * @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);
 }
<div> /**
 * 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;
 }
<div> /**
 * 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;
 }
 }
<div> return days;
 }
<div> /**
 * 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);
 }
<div> /**
 * 获得当前日期
 * 
 * @return int
 */
 public static int getToday() {
 Calendar calendar = Calendar.getInstance();
 return calendar.get(Calendar.DATE);
 }
<div> /**
 * 获得当前月份
 * 
 * @return int
 */
 public static int getToMonth() {
 Calendar calendar = Calendar.getInstance();
 return calendar.get(Calendar.MONTH) + 1;
 }
<div> /**
 * 获得当前年份
 * 
 * @return int
 */
 public static int getToYear() {
 Calendar calendar = Calendar.getInstance();
 return calendar.get(Calendar.YEAR);
 }
<div> /**
 * 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);
 }
<div> /**
 * 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);
 }
<div> /**
 * 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;
 }
<div> /**
 * 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;
 }
<div> /**
 * 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);
 }
<div> /**
 * 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;</div>
<div> }
<div> /**
 * 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);
 }
<div> /**
 * 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);
 }
<div> /**
 * 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();
 }
<div> /**
 * 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);
 }
<div> /**
 * 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";
 }
<div> /**
 * 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(
 "^((<a href="file://\\d{2}(([02468][048])|([13579][26]))-?((((0">\\d{2}(([02468][048])|([13579][26]))-?((((0</a>?");
 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])))))|(<a href="file://\\d{2}(([02468][12">\\d{2}(([02468][12</a>");
 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();
 }
<div> /**
 * 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();
 }
<div> /**
 * 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();
 }
<div> /**
 * 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);
 }
<div> /**
 * 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();
 }
<div> /**
 * 获取当前的日期(yyyy-MM-dd)
 */
 public static String currDay() {
 return DateUtil.dateToString(new Date(), DateUtil.LONG_DATE_FORMAT);
 }
<div> /**
 * 获取昨天的日期
 * 
 * @return
 */
 public static String befoDay() {
 return befoDay(DateUtil.LONG_DATE_FORMAT);
 }
<div> /**
 * 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);
 }
<div> /**
 * 获取明天的日期
 */
 public static String afterDay() {
 return DateUtil.dateToString(DateUtil.nextDay(new Date(), 1),
 DateUtil.LONG_DATE_FORMAT);
 }
<div> /**
 * 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;
 }
<div> /**
 * 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;
 }
<div> /** 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();
 }
<div> /**
 * 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);
 }
<div> /**
 * 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);
 }
}
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