Java开发时间处理工具类（全）

package test;

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.regex.Pattern;

public class DateTimeUtil {
public static String nowDate() {
GregorianCalendar calenda = new GregorianCalendar();
SimpleDateFormat sdf = new SimpleDateFormat(“yyyyMMdd”);
return sdf.format(calenda.getTime());
}

public static String now() {    GregorianCalendar calenda = new GregorianCalendar();    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    return sdf.format(calenda.getTime());}public static String timeFormatUtil(Date time) {    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 00:00:00");    return sdf.format(time);}public static String timeFormatToFinalUtil(Date time) {    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd 23:59:59");    return sdf.format(time);}public static String currentDate(String format) {    GregorianCalendar calenda = new GregorianCalendar();    SimpleDateFormat sdf =  null;    if ((null == format) || ("".equals(format)))        sdf = new SimpleDateFormat("yyyy-MM-dd");    else {        sdf = new SimpleDateFormat(format);    }    return sdf.format(calenda.getTime());}public static Date addDay(Date inDate, int day) {    Calendar calendar = new GregorianCalendar();    calendar.setTime(inDate);    calendar.add(5, day);    return calendar.getTime();}public static Date addDay(Date inDate, int day, int second) {    Calendar calendar = new GregorianCalendar();    calendar.setTime(inDate);    calendar.add(5, day);    calendar.set(11, 0);    calendar.set(12, 0);    calendar.set(13, second);    return calendar.getTime();}public static String addDay(String strDate, String pattern, int day) {    return date2Str(addDay(str2Date(strDate, pattern), day), pattern);}public static String addDay(Date date, String pattern, int day) {    return date2Str(addDay(date, day), pattern);}public static String date2Str(Date date, String pattern) {    SimpleDateFormat sdf = new SimpleDateFormat(pattern);    return sdf.format(date);}public static Date str2Date(String dateStr, String pattern) {    try {        DateFormat parser = new SimpleDateFormat(pattern);        return parser.parse(dateStr);    } catch (ParseException ex) {    }    return null;}public static int getWeek() {    Calendar calendar = Calendar.getInstance();    return (calendar.get(7) - 1);}public static String getMonth() {    Calendar calendar = Calendar.getInstance();    return calendar.get(1) + "-" + (calendar.get(2) + 1);}public static boolean isLeapYear(int year) {    return ((year % 4 == 0) && (((year % 100 != 0) || (year % 400 == 0))));}public static boolean isDateBefore(String date2) {    try {        Date date1 = new Date();        DateFormat df = DateFormat.getDateTimeInstance();        return date1.before(df.parse(date2));    } catch (ParseException e) {    }    return false;}public static boolean isDateBefore(String date1, String date2) {    try {        DateFormat df = DateFormat.getDateTimeInstance();        return df.parse(date1).before(df.parse(date2));    } catch (ParseException e) {    }    return false;}public static String getDate(long d, String pattern) {    Date c = new Date(d);    return date2Str(c, pattern);}public static long dayDiff(Date date1, Date date2) {    return ((date2.getTime() - date1.getTime()) / 86400000L);}public static String getAstro(String birth) {    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";}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();}/** * 获取日期本月最后一天 * @param date * @return */public static Date lastDayOfMonth(Date date) {    Calendar cal = Calendar.getInstance();    cal.setTime(date);    cal.set(Calendar.DAY_OF_MONTH, 1);    cal.add(Calendar.MONTH, 1);    cal.add(Calendar.DATE, -1);    cal.set(Calendar.HOUR_OF_DAY, 23);    cal.set(Calendar.MINUTE, 59);    cal.set(Calendar.SECOND, 59);    return cal.getTime();}/** * 获取日期本月最后一天 * @param date * @return */public static Date lastOfDay(Date date) {    Calendar cal = Calendar.getInstance();    cal.setTime(date);    cal.add(Calendar.YEAR, 1);    cal.set(Calendar.HOUR_OF_DAY, 23);    cal.set(Calendar.MINUTE, 59);    cal.set(Calendar.SECOND, 59);    return cal.getTime();}/** * 获取日期本月第一天 * @param date * @return */public static Date fristDayOfMonth(Date date) {    Calendar cal = Calendar.getInstance();    cal.setTime(date);    cal.set(Calendar.DAY_OF_MONTH, 1);    cal.set(Calendar.HOUR_OF_DAY, 0);    cal.set(Calendar.MINUTE, 0);    cal.set(Calendar.SECOND, 0);    return cal.getTime();}/** * 获取日期下个月的第一天 * @param date * @return */public static Date fristDayOfNextMonth(Date date) {    Calendar cal = Calendar.getInstance();    cal.setTime(date);    cal.set(Calendar.DAY_OF_MONTH, 1);    cal.add(Calendar.MONTH, 1);    cal.set(Calendar.HOUR_OF_DAY, 0);    cal.set(Calendar.MINUTE, 0);    cal.set(Calendar.SECOND, 0);    return cal.getTime();}/** * 每天零点时间戳 * @return */public static long getTimeOfZero() {    Calendar cal = Calendar.getInstance();    cal.setTime(new Date());    cal.set(Calendar.HOUR_OF_DAY, 0);    cal.set(Calendar.MINUTE, 0);    cal.set(Calendar.SECOND, 0);    cal.set(Calendar.MILLISECOND, 0);    cal.add(Calendar.DAY_OF_MONTH, 1);    return cal.getTimeInMillis() / 1000;}

}

以上是开发中遇到的一些可能用到的时间处理方法的简单总结，亲测可用。
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