Java操作日期時間范例代碼大全

dw23 9年前發布 | 5K 次閱讀 Java
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import org.apache.commons.lang.StringUtils;
/**

日期工具類

@author yugc
*/
public final class DateUtil {
private DateUtil() {
}
/**

yyyy-MM-dd
*/
public static final String FORMAT1 = "yyyy-MM-dd";
/**

yyyy.MM.dd
*/
public static final String FORMAT2 = "yyyy.MM.dd";
/**

yyyy/MM/dd
*/
public static final String FORMAT3 = "yyyy/MM/dd";
/**

yyyy-MM-dd HH:mm
*/
public static final String FORMAT4 = "yyyy-MM-dd HH:mm";
/**

yyyy.MM.dd HH:mm
*/
public static final String FORMAT5 = "yyyy.MM.dd HH:mm";
/**

yyyy/MM/dd HH:mm
*/
public static final String FORMAT6 = "yyyy/MM/dd HH:mm";
/**

yyyy-MM-dd HH:mm:ss
*/
public static final String FORMAT7 = "yyyy-MM-dd HH:mm:ss";
/**

YYYY-MM-dd HH-mm-ss
*/
public static final String FORMAT15 = "YYYY-MM-dd HH-mm-ss";
/**

yyyy.MM.dd HH:mm:ss
*/
public static final String FORMAT8 = "yyyy.MM.dd HH:mm:ss";
/**

yyyy/MM/dd HH:mm:ss
*/
public static final String FORMAT9 = "yyyy/MM/dd HH:mm:ss";
/**

yyyy_MM_dd_HH_mm_ss
*/
public static final String FORMAT10 = "yyyy_MM_dd_HH_mm_ss";
/**

yy-MM-dd
*/
public static final String FORMAT11 = "yy-MM-dd";
/**

yyyyMMdd
*/
public static final String FORMAT12 = "yyyyMMdd";
/**

yyyyMMddHHmmss
*/
public static final String FORMAT13 = "yyyyMMddHHmmss";
/**

yyyyMM
*/
public static final String FORMAT14 = "yyyyMM";
public static Date getCurrentDate() {
return new Date(System.currentTimeMillis());
}
public static Date getYesterDay() {
return addDay(new Date(System.currentTimeMillis()), -1);
}
public static String getYesterDayString() {
return parseDateToString(addDay(new Date(System.currentTimeMillis()), -1), FORMAT1);
}
/**

得到年月日的路徑
@return
*/
public static String getThisYearMonthDay(String dateString) {
Date date = parseStringToDate(dateString, FORMAT12);
return DateUtil.getYear(date) + "/" + DateUtil.getMonth(date) + "/" + DateUtil.getDay(date) + "/";
}
/**

返回當前日期或時間

@param format
@return
*/
public static String getCurrentDate(String format) {
if (StringUtils.isBlank(format)) {

 format = FORMAT1;

}
Date date = new Date();
SimpleDateFormat formatter = new SimpleDateFormat(format);
String currentTime = formatter.format(date);
return currentTime;
}
/**

返回當前時間

@return
*/
public static String getCurrentTime() {
String datetime = getCurrentDate(FORMAT7);
 String time = datetime.substring(datetime.indexOf(" ") + 1);
return time;
}
/**

返回當前時間加隨機數

@return
*/
public static String getCurrentDateTimeRandom() {
String datetime = getCurrentDate(DateUtil.FORMAT10) + "_" + Math.random();
return datetime;
}
/**

返回當前時間和日期
@return
*/
public static String getCurrentDateTimeString() {
return getCurrentDate(DateUtil.FORMAT7);
}
/**

返回當前日期

@return
*/
public static Date getCurrentDateTime() {
String datetime = getCurrentDate(FORMAT7);
return parseStringToDate(datetime, "");
}
public static Timestamp getCurrentTimestamp() {
String datetime = getCurrentDate(FORMAT7);
return parseStringToTimestamp(datetime, "");
}
public static Timestamp getCurrentTimestamp(String format) {
String datetime = getCurrentDate(format);
return parseStringToTimestamp(datetime, "");
}
/**

日期轉換為字符串

@param date 日期
@param format 格式
@return 返回字符型日期
*/
public static String parseDateToString(Date date, String format) {
String result = "";
 DateFormat formatter = null;
 try {

 if (date != null) {
     if (StringUtils.isBlank(format)) {
         formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
     }
     else {
         formatter = new SimpleDateFormat(format);
     }
     result = formatter.format(date);
 }

}
 catch (Exception e) {
 }
return result;
}
/**

時間1-時間2的毫秒

@param t1
@param t2
@return
*/
public static long between(Timestamp t1, Timestamp t2) {
if ((t1 != null) && (t2 != null)) {

 return t1.getTime() - t2.getTime();

}
return 0;
}
/**

兩個日期date1-date2相減，相差的天數

@param date1
日期
@param date2
日期
@return 返回相減后的日期
*/
public static int betweenTwoDates(Date date1, Date date2) {
return (int) ((getMillis(date1) - getMillis(date2)) / (24  3600  1000));
}
/**

將字符串轉換為日期   

@param str   
@return   
@throws ParseException 
*/
public static Date parseStringToDate(String str, String format) {
DateFormat formatter = null;
 Date date = null;
 if (StringUtils.isNotBlank(str)) {

 if (StringUtils.isBlank(format)) {
     formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 }
 else {
     formatter = new SimpleDateFormat(format);
 }

 try {
     date = formatter.parse(str);
 }
 catch (ParseException e) {
     e.printStackTrace();
 }

}
return date;
}
/**

返回2007到今年的年份

@return
*/
public static List<Integer> get2007ToThisYear() {
// 當前時間
 Calendar c = Calendar.getInstance();
 c.setTime(new Date());
// 返回的年份
 List<Integer> the2007ToThisYearList = new ArrayList<Integer>();
 // 當前年
 int thisYear = c.get(Calendar.YEAR);
for (int i = thisYear; i >= 2007; i--) {

 the2007ToThisYearList.add(i);

}
return the2007ToThisYearList;
}
/**

獲取當前月的前幾個月份的時間
@param months 
@return
*/
public static Date getDateBeforeMonths(int months) {
// 當前時間
 Calendar c = Calendar.getInstance();
c.add(Calendar.MONTH, -months);
return c.getTime();
}
/**

獲取當前日期的前幾天的時間
@param days
@return
*/
public static Date getDateBeforeDays(int days) {
// 當前時間
 Calendar c = Calendar.getInstance();
c.add(Calendar.DATE, -days);
 return c.getTime();
}
/**

返回1-12月份

@return
*/
public static List<String> getAllMonth() {
List<String> theMonthList = new ArrayList<String>();
for (int i = 1; i < 13; i++) {

 if (i < 10) {
     theMonthList.add("0" + i);
 }
 else {
     theMonthList.add("" + i);
 }

}
return theMonthList;
}
/**

返回日期中的年份

@param date
日期
@return 返回年份
*/
public static int getYear(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.get(Calendar.YEAR);
}
/**

返回日期中的月份

@param date
日期
@return 返回月份
*/
public static int getMonth(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.get(Calendar.MONTH) + 1;
}
/**

返回日期中的日

@param date
日期
@return 返回日
*/
public static int getDay(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.get(Calendar.DAY_OF_MONTH);
}
/**

返回日期中的小時

@param date
日期
@return 返回小時
*/
public static int getHour(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.get(Calendar.HOUR_OF_DAY);
}
/**

返回日期中的分鐘

@param date
日期
@return 返回分鐘
*/
public static int getMinute(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.get(Calendar.MINUTE);
}
/**

返回日期中的秒鐘

@param date
日期
@return 返回秒鐘
*/
public static int getSecond(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.get(Calendar.SECOND);
}
/**

返回日期代表的毫秒

@param date
日期
@return 返回毫秒
*/
public static long getMillis(Date date) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
return c.getTimeInMillis();
}
/**

返回當前日期代表的毫秒

@return
*/
public static long getCurrentTimeMillis() {
return System.currentTimeMillis();
}
public static Date addMonth(Date date, int month) {
Calendar c = Calendar.getInstance();
 c.setTime(date);
 c.add(c.MONTH, month);
return c.getTime();
}
/**

日期加天數,可以向前加，向后加

@param date
日期
@param day
天數
@return 返回相加后的日期
*/
public static Date addDay(Date date, int day) {
Calendar c = Calendar.getInstance();
 c.setTimeInMillis(getMillis(date) + ((long) day)  24  3600 * 1000);
return c.getTime();
}
/**

日期加秒數,可以向前加，向后加

@param date
日期
@param second
秒數
@return 返回相加后的日期
*/
public static Date addSecond(Date date, long second) {
Calendar c = Calendar.getInstance();
 c.setTimeInMillis(getMillis(date) + second * 1000);
return c.getTime();
}
/**

根據一個日期，返回是星期幾   

@param sdate   
@return

*/
public static String getWeekByDate(String sdate) {
// 再轉換為時間
 Date date = parseStringToDate(sdate, "");
 Calendar c = Calendar.getInstance();
 c.setTime(date);
 int day = c.get(Calendar.DAY_OF_WEEK);
 // day中存的就是星期幾了，其范圍 1~7
 // 1=星期日 7=星期六，其他類推
 return day + "";
}





/**   
 * 根據一個日期，返回是星期幾
 * 1=星期日 7=星期六，其他類推   
 *    
 * @param sdate   
 * @return   
 */
public static int getWeekByDate(Date date) {

    // 再轉換為時間
    Calendar c = Calendar.getInstance();
    c.setTime(date);
    // day中存的就是星期幾了，其范圍 1~7
    // 1=星期日 7=星期六，其他類推
    return c.get(Calendar.DAY_OF_WEEK);
}


/**
 * 日期為一年中的第幾周
 * @return
 */
public static String getWeekNum(Date date) {

    Calendar c = Calendar.getInstance(Locale.CHINA);
    c.setTime(date);
    String week = Integer.toString(c.get(Calendar.WEEK_OF_YEAR));

    return week;

}

public static java.sql.Date parseUtilDateToSqlDate(Date date) {

    if (date != null) {
        return new java.sql.Date(date.getTime());
    }
    else {
        return null;
    }
}

public static java.sql.Date parseStringToSqlDate(String dateStr, String format) {

    Date date = null;
    if (StringUtils.isBlank(format)) {
        date = parseStringToDate(dateStr, "yyyy-MM-dd HH:mm:ss");
    }
    else {
        date = parseStringToDate(dateStr, format);
    }

    return parseUtilDateToSqlDate(date);
}

public static Timestamp parseUtilDateToTimestamp(Date date, String format) {

    return parseStringToTimestamp(parseDateToString(date, format), format);
}

public static Date parseTimestampToUtilDate(Timestamp date, String format) {

    return parseStringToDate(parseDateToString(date, format), format);
}

public static Timestamp parseStringToTimestamp(String dateStr, String format) {

    if (StringUtils.isBlank(dateStr)) {
        return null;
    }

    Date date = null;
    if (StringUtils.isBlank(format)) {
        date = parseStringToDate(dateStr, "yyyy-MM-dd HH:mm:ss");
    }
    else {
        date = parseStringToDate(dateStr, format);
    }

    if (date != null) {
        long t = date.getTime();
        return new Timestamp(t);
    }
    else {
        return null;
    }
}

/**
 * 獲取時間2099-12-31，23:59:59
 * 
 * @return
 */
public static Timestamp getMaxTimestamp() {

    return DateUtil.parseStringToTimestamp("2099-12-31 23:59:59", DateUtil.FORMAT7);
}

/**
 * 返回日期中的年月日，格式化成yyyyMMdd
 * @param date
 * @return
 */
public static String getYearMonthDay(Date date) {

    SimpleDateFormat formatter = new SimpleDateFormat(FORMAT12);

    String currentTime = formatter.format(date);

    return currentTime;
}

/**
 * 取得指定月份的第一天
 *
 * @param strdate String
 * @return String
 */
public static String getMonthBegin(String strdate) {

    return parseDateToString(parseStringToDate(strdate, "yyyy-MM"), "");
}

/**
 * 取得指定月份的最后一天
 *
 * @param strdate String
 * @return String
 */
public static String getMonthEnd(String strdate) {

    Date date = parseStringToDate(getMonthBegin(strdate), "");
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.MONTH, 1);
    calendar.add(Calendar.DAY_OF_YEAR, -1);

    return parseDateToString(calendar.getTime(), "");
}

public static String getPreviousMonthBegin() {

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1);
    Date date = new Date(cal.getTimeInMillis());

    return parseDateToString(parseStringToDate(parseDateToString(date, FORMAT1), "yyyy-MM"), FORMAT1);
}

public static String getPreviousMonthEnd() {

    Date date = parseStringToDate(getPreviousMonthBegin(), FORMAT1);
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.MONTH, 1);
    calendar.add(Calendar.DAY_OF_YEAR, -1);

    return parseDateToString(calendar.getTime(), FORMAT1);
}

/**
 * 上個月
 * 
 * @return
 */
public static String getPreviousMonth() {

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 1);
    Date date = new Date(cal.getTimeInMillis());

    return parseDateToString(parseStringToDate(parseDateToString(date, FORMAT1), "yyyy-MM"), FORMAT14);
}

/**
 * 上兩個月
 * 
 * @return
 */
public static String getPreviousTwoMonth() {

    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.MONTH, cal.get(Calendar.MONTH) - 2);
    Date date = new Date(cal.getTimeInMillis());

    return parseDateToString(parseStringToDate(parseDateToString(date, FORMAT1), "yyyy-MM"), FORMAT14);
}

/**
 * 判斷兩個日期是否在同一周
 * @param date1
 * @param date2
 * @return
 */
public static boolean isSameWeekDates(Date date1, Date date2) {

    Calendar cal1 = Calendar.getInstance();
    Calendar cal2 = Calendar.getInstance();
    cal1.setTime(date1);
    cal2.setTime(date2);
    int subYear = cal1.get(Calendar.YEAR) - cal2.get(Calendar.YEAR);
    if (0 == subYear) {
        if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)) {
            return true;
        }
    }
    else if ((1 == subYear) && (11 == cal2.get(Calendar.MONTH))) {
        // 如果12月的最后一周橫跨來年第一周的話則最后一周即算做來年的第一周
        if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)) {
            return true;
        }
    }
    else if ((-1 == subYear) && (11 == cal1.get(Calendar.MONTH))) {
        if (cal1.get(Calendar.WEEK_OF_YEAR) == cal2.get(Calendar.WEEK_OF_YEAR)) {
            return true;
        }
    }
    return false;
}

public static void main(String[] args) {

    System.out.println(getPreviousMonthBegin());
    System.out.println(getPreviousMonthEnd());
    System.out.println(getYearMonthDay(new Date()));
    System.out.println(getYearMonthDay(parseStringToDate("2009-11-2 12:1:21", FORMAT7)));
    System.out.println("current time: " + getCurrentDateTime());
    System.out.println("addsecond: " + addSecond(getCurrentDateTime(), -1L));
    Date date = new Date();
    System.out.println("current date: " + date.toString());

    System.out.println("test parseDateToString: " + parseDateToString(date, ""));
    System.out.println("test parseStringToDate: " + parseStringToDate("1990-01-1 00:00:00", ""));

    System.out.println("test getYear: " + getYear(date));
    System.out.println("test getMonth: " + getMonth(date));
    System.out.println("test getDay: " + getDay(date));
    System.out.println("test getHour: " + getHour(date));
    System.out.println("test getMinute: " + getMinute(date));
    System.out.println("test getSecond: " + getSecond(date));
    System.out.println("test getMillis: " + getMillis(date));
    System.out.println("test addDate: " + addDay(date, 2));
    System.out.println("test betweenTwoDays: " + betweenTwoDates(date, addDay(date, 2)));
    System.out.println("test getWeekNum: " + getWeekNum(addDay(date, -2)));
    System.out.println("test getWeekByDate: " + getWeekByDate(parseDateToString(date, "")));
    System.out.println("test getMonthBegin: " + getMonthBegin(parseDateToString(date, "")));
    System.out.println("test getMonthEnd: " + getMonthEnd(parseDateToString(date, "")));
    System.out.println("test isSameWeekDates: " + isSameWeekDates(date, addDay(date, -2)));

    System.out.println(getPreviousTwoMonth());
    System.out.println(getPreviousMonth());
    List<Integer> yearList = get2007ToThisYear();
    List<String> monthList = getAllMonth();
}

public static String addOneDay(String stopTime) {
    String finishTime = stopTime;
    Date finishDate = null;
    if(stopTime != null && !"".equals(stopTime))
    {
        if(stopTime.length() < 19)
        {
            finishTime = stopTime.substring(0, 10) + " 00:00:00";
        }
        finishDate = DateUtil.parseStringToDate(finishTime, DateUtil.FORMAT7);
        finishDate = DateUtil.addDay(finishDate, 1);
        return DateUtil.parseDateToString(finishDate, DateUtil.FORMAT7);
    }else{
        return null;
    }
}


/**
 * 給date加1天
 * @param date
 * @return
 */
public static Date addOneDay(Date date) {

    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date);
    calendar.add(Calendar.DATE, 1);
    return calendar.getTime();
}


}
 </pre>
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