JAVA时间Date工具类

package com.common.util;

import java.text.DateFormat;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

public class DateUtils {

	private StringBuffer buffer = new StringBuffer();

	private static String ZERO = "0";

	private static DateUtils date;

	public static SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");

	public static SimpleDateFormat format1 = new SimpleDateFormat(

			"yyyyMMdd HH:mm:ss");

	public static SimpleDateFormat common_format = new SimpleDateFormat(

			"yyyy-MM-dd HH:mm:ss");

	public String getNowString() {

		Calendar calendar = getCalendar();

		buffer.delete(0, buffer.capacity());

		buffer.append(getYear(calendar));

		if (getMonth(calendar) < 10) {

			buffer.append(ZERO);

		}

		buffer.append(getMonth(calendar));

		if (getDate(calendar) < 10) {

			buffer.append(ZERO);

		}

		buffer.append(getDate(calendar));

		if (getHour(calendar) < 10) {

			buffer.append(ZERO);

		}

		buffer.append(getHour(calendar));

		if (getMinute(calendar) < 10) {

			buffer.append(ZERO);

		}

		buffer.append(getMinute(calendar));

		if (getSecond(calendar) < 10) {

			buffer.append(ZERO);

		}

		buffer.append(getSecond(calendar));

		return buffer.toString();

	}

	private static int getDateField(Date date, int field) {

		Calendar c = getCalendar();

		c.setTime(date);

		return c.get(field);

	}

	public static int getYearsBetweenDate(Date begin, Date end) {

		int bYear = getDateField(begin, Calendar.YEAR);

		int eYear = getDateField(end, Calendar.YEAR);

		return eYear - bYear;

	}

	public static int getMonthsBetweenDate(Date begin, Date end) {

		int bMonth = getDateField(begin, Calendar.MONTH);

		int eMonth = getDateField(end, Calendar.MONTH);

		return eMonth - bMonth;

	}

	public static int getWeeksBetweenDate(Date begin, Date end) {

		int bWeek = getDateField(begin, Calendar.WEEK_OF_YEAR);

		int eWeek = getDateField(end, Calendar.WEEK_OF_YEAR);

		return eWeek - bWeek;

	}

	public static int getDaysBetweenDate(Date begin, Date end) {

		return (int) ((end.getTime()-begin.getTime())/(1000 * 60 * 60 * 24));

	}

	public static void main(String args[]) {

		System.out.println(getSpecficMonthStart(Calendar.getInstance().getTime(), 0));

	}

	/**

	 * 获取date年后的amount年的第一天的开始时间

	 *

	 * @param amount

	 *            可正、可负

	 * @return

	 */

	public static Date getSpecficYearStart(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setTime(date);

		cal.add(Calendar.YEAR, amount);

		cal.set(Calendar.DAY_OF_YEAR, 1);

		return getStartDate(cal.getTime());

	}

	/**

	 * 获取date年后的amount年的最后一天的终止时间

	 *

	 * @param amount

	 *            可正、可负

	 * @return

	 */

	public static Date getSpecficYearEnd(Date date, int amount) {

		Date temp = getStartDate(getSpecficYearStart(date, amount + 1));

		Calendar cal = Calendar.getInstance();

		cal.setTime(temp);

		cal.add(Calendar.DAY_OF_YEAR, -1);

		return getFinallyDate(cal.getTime());

	}

	/**

	 * 获取date月后的amount月的第一天的开始时间

	 *

	 * @param amount

	 *            可正、可负

	 * @return

	 */

	public static Date getSpecficMonthStart(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setTime(date);

		cal.add(Calendar.MONTH, amount);

		cal.set(Calendar.DAY_OF_MONTH, 1);

		return getStartDate(cal.getTime());

	}

	/**

	 * 获取当前自然月后的amount月的最后一天的终止时间

	 *

	 * @param amount

	 *            可正、可负

	 * @return

	 */

	public static Date getSpecficMonthEnd(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setTime(getSpecficMonthStart(date, amount + 1));

		cal.add(Calendar.DAY_OF_YEAR, -1);

		return getFinallyDate(cal.getTime());

	}

	/**

	 * 获取date周后的第amount周的开始时间（这里星期一为一周的开始）

	 *

	 * @param amount

	 *            可正、可负

	 * @return

	 */

	public static Date getSpecficWeekStart(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setTime(date);

		cal.setFirstDayOfWeek(Calendar.MONDAY); /* 设置一周的第一天为星期一 */

		cal.add(Calendar.WEEK_OF_MONTH, amount);

		cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);

		return getStartDate(cal.getTime());

	}

	/**

	 * 获取date周后的第amount周的最后时间（这里星期日为一周的最后一天）

	 *

	 * @param amount

	 *            可正、可负

	 * @return

	 */

	public static Date getSpecficWeekEnd(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setFirstDayOfWeek(Calendar.MONDAY); /* 设置一周的第一天为星期一 */

		cal.add(Calendar.WEEK_OF_MONTH, amount);

		cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);

		return getFinallyDate(cal.getTime());

	}

	public static Date getSpecficDateStart(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setTime(date);

		cal.add(Calendar.DAY_OF_YEAR, amount);

		return getStartDate(cal.getTime());

	}

	public static Date getSpecficDateEnd(Date date, int amount) {

		Calendar cal = Calendar.getInstance();

		cal.setTime(date);

		cal.add(Calendar.DAY_OF_YEAR, amount);

		return getFinallyDate(cal.getTime());

	}

	/**

	 * 得到指定日期的一天的的最后时刻23:59:59

	 *

	 * @param date

	 * @return

	 */

	public static Date getFinallyDate(Date date) {

		String temp = format.format(date);

		temp += " 23:59:59";

		try {

			return format1.parse(temp);

		} catch (ParseException e) {

			return null;

		}

	}

	/**

	 * 得到指定日期的一天的的最后时刻23:59:59

	 *

	 * @param date

	 * @return

	 */

	public static String getFinallyDateStr(Date date) {

		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");

		String temp = format.format(date);

		temp += " 23:59:59";

		try {

			return temp;

		} catch (Exception e) {

			return temp;

		}

	}

	/**

	 * 得到指定日期的一天的开始时刻00:00:00

	 *

	 * @param date

	 * @return

	 */

	public static Date getStartDate(Date date) {

		String temp = format.format(date);

		temp += " 00:00:00";

		try {

			return format1.parse(temp);

		} catch (Exception e) {

			return null;

		}

	}

	/**

	 * 得到指定日期的一天的开始时刻00:00:00

	 *

	 * @param date

	 * @return

	 */

	public static String getStartDateStr(Date date) {

		DateFormat format = new SimpleDateFormat("yyyy-MM-dd");

		String temp = format.format(date);

		temp += " 00:00:00";

		try {

			return temp;

		} catch (Exception e) {

			return temp;

		}

	}

	/**

	 *

	 * @param date

	 *            指定比较日期

	 * @param compareDate

	 * @return

	 */

	public static boolean isInDate(Date date, Date compareDate) {

		if (compareDate.after(getStartDate(date))

				&& compareDate.before(getFinallyDate(date))) {

			return true;

		} else {

			return false;

		}

	}

	/**

	 * 获取两个时间的差值秒

	 * @param d1

	 * @param d2

	 * @return

	 */

	public static Integer getSecondBetweenDate(Date d1,Date d2){

		Long second=(d2.getTime()-d1.getTime())/1000;

		return second.intValue();

	}

	private int getYear(Calendar calendar) {

		return calendar.get(Calendar.YEAR);

	}

	private int getMonth(Calendar calendar) {

		return calendar.get(Calendar.MONDAY) + 1;

	}

	private int getDate(Calendar calendar) {

		return calendar.get(Calendar.DATE);

	}

	private int getHour(Calendar calendar) {

		return calendar.get(Calendar.HOUR_OF_DAY);

	}

	private int getMinute(Calendar calendar) {

		return calendar.get(Calendar.MINUTE);

	}

	private int getSecond(Calendar calendar) {

		return calendar.get(Calendar.SECOND);

	}

	private static Calendar getCalendar() {

		return Calendar.getInstance();

	}

	public static DateUtils getDateInstance() {

		if (date == null) {

			date = new DateUtils();

		}

		return date;

	}

}

package com.jetcms.common.util;

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

/**
 * @author hzp
 */
public class DateUtils {
   private StringBuffer buffer = new StringBuffer();
   private static String ZERO = "0";
   private static DateUtils date;
   public static SimpleDateFormat format = new SimpleDateFormat("yyyyMMdd");
   public static SimpleDateFormat format1 = new SimpleDateFormat(
         "yyyyMMdd HH:mm:ss");
   public static SimpleDateFormat common_format = new SimpleDateFormat(
         "yyyy-MM-dd HH:mm:ss");

   public String getNowString() {
      Calendar calendar = getCalendar();
buffer.delete(, buffer.capacity());
buffer.append(getYear(calendar));

      if (getMonth(calendar) < ) {
         buffer.append(ZERO);
}
      buffer.append(getMonth(calendar));

      if (getDate(calendar) < ) {
         buffer.append(ZERO);
}
      buffer.append(getDate(calendar));
      if (getHour(calendar) < ) {
         buffer.append(ZERO);
}
      buffer.append(getHour(calendar));
      if (getMinute(calendar) < ) {
         buffer.append(ZERO);
}
      buffer.append(getMinute(calendar));
      if (getSecond(calendar) < ) {
         buffer.append(ZERO);
}
      buffer.append(getSecond(calendar));
      return buffer.toString();
}

   private static int getDateField(Date date, int field) {
      Calendar c = getCalendar();
c.setTime(date);
      return c.get(field);
}

   public static int getYearsBetweenDate(Date begin, Date end) {
      int bYear = getDateField(begin, Calendar.YEAR);
      int eYear = getDateField(end, Calendar.YEAR);
      return eYear - bYear;
}

   public static int getMonthsBetweenDate(Date begin, Date end) {
      int bMonth = getDateField(begin, Calendar.MONTH);
      int eMonth = getDateField(end, Calendar.MONTH);
      return eMonth - bMonth;
}

   public static int getWeeksBetweenDate(Date begin, Date end) {
      int bWeek = getDateField(begin, Calendar.WEEK_OF_YEAR);
      int eWeek = getDateField(end, Calendar.WEEK_OF_YEAR);
      return eWeek - bWeek;
}

   public static int getDaysBetweenDate(Date begin, Date end) {
      return (int) ((end.getTime()-begin.getTime())/(1000 * 60 * 60 * ));
}

   public static void main(String args[]) {
      System.out.println(getSpecficMonthStart(Calendar.getInstance().getTime(), ));
}

   /**
    * 获取date年后的amount年的第一天的开始时间
* 
    * @param amount
*            可正、可负
* @return
*/
public static Date getSpecficYearStart(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.YEAR, amount);
cal.set(Calendar.DAY_OF_YEAR, );
      return getStartDate(cal.getTime());
}

   /**
    * 获取date年后的amount年的最后一天的终止时间
* 
    * @param amount
*            可正、可负
* @return
*/
public static Date getSpecficYearEnd(Date date, int amount) {
      Date temp = getStartDate(getSpecficYearStart(date, amount + ));
Calendar cal = Calendar.getInstance();
cal.setTime(temp);
cal.add(Calendar.DAY_OF_YEAR, -);
      return getFinallyDate(cal.getTime());
}

   /**
    * 获取date月后的amount月的第一天的开始时间
* 
    * @param amount
*            可正、可负
* @return
*/
public static Date getSpecficMonthStart(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.MONTH, amount);
cal.set(Calendar.DAY_OF_MONTH, );
      return getStartDate(cal.getTime());
}

   /**
    * 获取当前自然月后的amount月的最后一天的终止时间
* 
    * @param amount
*            可正、可负
* @return
*/
public static Date getSpecficMonthEnd(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setTime(getSpecficMonthStart(date, amount + ));
cal.add(Calendar.DAY_OF_YEAR, -);
      return getFinallyDate(cal.getTime());
}

   /**
    * 获取date周后的第amount周的开始时间（这里星期一为一周的开始）
* 
    * @param amount
*            可正、可负
* @return
*/
public static Date getSpecficWeekStart(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.setFirstDayOfWeek(Calendar.MONDAY); /* 设置一周的第一天为星期一 */
cal.add(Calendar.WEEK_OF_MONTH, amount);
cal.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
      return getStartDate(cal.getTime());
}

   /**
    * 获取date周后的第amount周的最后时间（这里星期日为一周的最后一天）
* 
    * @param amount
*            可正、可负
* @return
*/
public static Date getSpecficWeekEnd(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setFirstDayOfWeek(Calendar.MONDAY); /* 设置一周的第一天为星期一 */
cal.add(Calendar.WEEK_OF_MONTH, amount);
cal.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
      return getFinallyDate(cal.getTime());
}

   public static Date getSpecficDateStart(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.DAY_OF_YEAR, amount);
      return getStartDate(cal.getTime());
}

   public static Date getSpecficDateEnd(Date date, int amount) {
      Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.DAY_OF_YEAR, amount);
      return getFinallyDate(cal.getTime());
}

   /**
    * 得到指定日期的一天的的最后时刻23:59:59
    * 
    * @param date
* @return
*/
public static Date getFinallyDate(Date date) {
      String temp = format.format(date);
temp += " 23:59:59";

      try {
         return format1.parse(temp);
} catch (ParseException e) {
         return null;
}
   }

   /**
    * 得到指定日期的一天的的最后时刻23:59:59
    *
    * @param date
* @return
*/
public static String getFinallyDateStr(Date date) {
      DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String temp = format.format(date);
temp += " 23:59:59";

      try {
         return temp;
} catch (Exception e) {
         return temp;
}
   }

   /**
    * 得到指定日期的一天的开始时刻00:00:00
    * 
    * @param date
* @return
*/
public static Date getStartDate(Date date) {
      String temp = format.format(date);
temp += " 00:00:00";

      try {
         return format1.parse(temp);
} catch (Exception e) {
         return null;
}
   }

   /**
    * 得到指定日期的一天的开始时刻00:00:00
    *
    * @param date
* @return
*/
public static String getStartDateStr(Date date) {
      DateFormat format = new SimpleDateFormat("yyyy-MM-dd");
String temp = format.format(date);
temp += " 00:00:00";

      try {
         return temp;
} catch (Exception e) {
         return temp;
}
   }

   /**
    * 
    * @param date
*            指定比较日期
* @param compareDate
* @return
*/
public static boolean isInDate(Date date, Date compareDate) {
      if (compareDate.after(getStartDate(date))
            && compareDate.before(getFinallyDate(date))) {
         return true;
} else {
         return false;
}

   }

   /**
    * 获取两个时间的差值秒
* @param d1
* @param d2
* @return
*/
public static Integer getSecondBetweenDate(Date d1,Date d2){
      Long second=(d2.getTime()-d1.getTime())/;
      return second.intValue();
}

   private int getYear(Calendar calendar) {
      return calendar.get(Calendar.YEAR);
}

   private int getMonth(Calendar calendar) {
      return calendar.get(Calendar.MONDAY) + ;
}

   private int getDate(Calendar calendar) {
      return calendar.get(Calendar.DATE);
}

   private int getHour(Calendar calendar) {
      return calendar.get(Calendar.HOUR_OF_DAY);
}

   private int getMinute(Calendar calendar) {
      return calendar.get(Calendar.MINUTE);
}

   private int getSecond(Calendar calendar) {
      return calendar.get(Calendar.SECOND);
}

   private static Calendar getCalendar() {
      return Calendar.getInstance();
}

   public static DateUtils getDateInstance() {
      if (date == null) {
         date = new DateUtils();
}
      return date;
}
}

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