2個比較常用的時間Java工具類
例如取得10天后的日期、當前月所在第幾季度等，為此我整理了2個很好用的工具類，代碼如下
1.求X天后的日期
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
public class Datetest {
/**
*
* @param datestr 日期字符串
* @param day 相對天數，為正數表示之后，為負數表示之前
* @return 指定日期字符串n天之前或者之后的日期
*/
public static String getBeforeAfterDate(String datestr, int day) {
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Date olddate = null;
try {
df.setLenient(false);
olddate = new Date(df.parse(datestr).getTime());
} catch (ParseException e) {
throw new RuntimeException("日期轉換錯誤");
}
Calendar cal = Calendar.getInstance();
cal.setTime(olddate);
int Year = cal.get(Calendar.YEAR);
int Month = cal.get(Calendar.MONTH);
int Day = cal.get(Calendar.DAY_OF_MONTH);
int NewDay = Day + day;
cal.set(Calendar.YEAR, Year);
cal.set(Calendar.MONTH, Month);
cal.set(Calendar.DAY_OF_MONTH, NewDay);
return df.format(cal.getTimeInMillis());
}
public static void main(String[] args) {
System.out.println(getBeforeAfterDate("2013-12-29",10)); //獲取2013-12-29之后10天的日期
}
}</pre>2.有關季度日期的算法
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
/**
*
* @author px
* @date 2010-04-26
*
*/
public class DateUtils {
// private static final Log logger = LogFactory.getLog(DateUtils.class);
public static final String YYYYMMDD = "yyyy-MM-dd";
public static final String YYYYMMDD_ZH = "yyyy年MM月dd日";
public static final int FIRST_DAY_OF_WEEK = Calendar.MONDAY; //中國周一是一周的第一天
/**
*
* @param strDate
* @return
*/
public static Date parseDate(String strDate) {
return parseDate(strDate, null);
}
/**
* parseDate
*
* @param strDate
* @param pattern
* @return
*/
public static Date parseDate(String strDate, String pattern) {
Date date = null;
try {
if(pattern == null) {
pattern = YYYYMMDD;
}
SimpleDateFormat format = new SimpleDateFormat(pattern);
date = format.parse(strDate);
} catch (Exception e) {
e.printStackTrace();
}
return date;
}
/**
* format date
*
* @param date
* @return
*/
public static String formatDate(Date date) {
return formatDate(date, null);
}
/**
* format date
*
* @param date
* @param pattern
* @return
*/
public static String formatDate(Date date, String pattern) {
String strDate = null;
try {
if(pattern == null) {
pattern = YYYYMMDD;
}
SimpleDateFormat format = new SimpleDateFormat(pattern);
strDate = format.format(date);
} catch (Exception e) {
e.printStackTrace();
}
return strDate;
}
/**
* 取得一年的第幾周
*
* @param date
* @return
*/
public static int getWeekOfYear(Date date){
Calendar c = Calendar.getInstance();
c.setTime(date);
int week_of_year = c.get(Calendar.WEEK_OF_YEAR);
return week_of_year - 1;
}
/**
* getWeekBeginAndEndDate
*
* @param date
* @param pattern
* @return
*/
public static String getWeekBeginAndEndDate(Date date, String pattern){
Date monday = getMondayOfWeek(date);
Date sunday = getSundayOfWeek(date);
return formatDate(monday, pattern) + " - " + formatDate(sunday, pattern) ;
}
/**
* 根據日期取得對應周周一日期
*
* @param date
* @return
*/
public static Date getMondayOfWeek(Date date) {
Calendar monday = Calendar.getInstance();
monday.setTime(date);
monday.setFirstDayOfWeek(FIRST_DAY_OF_WEEK);
monday.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY);
return monday.getTime();
}
/**
* 根據日期取得對應周周日日期
*
* @param date
* @return
*/
public static Date getSundayOfWeek(Date date) {
Calendar sunday = Calendar.getInstance();
sunday.setTime(date);
sunday.setFirstDayOfWeek(FIRST_DAY_OF_WEEK);
sunday.set(Calendar.DAY_OF_WEEK, Calendar.SUNDAY);
return sunday.getTime();
}
/**
* 取得月的剩余天數
*
* @param date
* @return
*/
public static int getRemainDayOfMonth(Date date) {
int dayOfMonth = getDayOfMonth(date);
int day = getPassDayOfMonth(date);
return dayOfMonth - day;
}
/**
* 取得月已經過的天數
*
* @param date
* @return
*/
public static int getPassDayOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.get(Calendar.DAY_OF_MONTH);
}
/**
* 取得月天數
*
* @param date
* @return
*/
public static int getDayOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
return c.getActualMaximum(Calendar.DAY_OF_MONTH);
}
/**
* 取得月第一天
*
* @param date
* @return
*/
public static Date getFirstDateOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_MONTH, c.getActualMinimum(Calendar.DAY_OF_MONTH));
return c.getTime();
}
/**
* 取得月最后一天
*
* @param date
* @return
*/
public static Date getLastDateOfMonth(Date date) {
Calendar c = Calendar.getInstance();
c.setTime(date);
c.set(Calendar.DAY_OF_MONTH, c.getActualMaximum(Calendar.DAY_OF_MONTH));
return c.getTime();
}
/**
* 取得季度第一天
*
* @param date
* @return
*/
public static Date getFirstDateOfSeason(Date date) {
return getFirstDateOfMonth(getSeasonDate(date)[0]);
}
/**
* 取得季度最后一天
*
* @param date
* @return
*/
public static Date getLastDateOfSeason(Date date) {
return getLastDateOfMonth(getSeasonDate(date)[2]);
}
/**
* 取得季度天數
* @param date
* @return
*/
public static int getDayOfSeason(Date date) {
int day = 0;
Date[] seasonDates = getSeasonDate(date);
for (Date date2 : seasonDates) {
day += getDayOfMonth(date2);
}
return day;
}
/**
* 取得季度剩余天數
*
* @param date
* @return
*/
public static int getRemainDayOfSeason(Date date) {
return getDayOfSeason(date) - getPassDayOfSeason(date);
}
/**
* 取得季度已過天數
*
* @param date
* @return
*/
public static int getPassDayOfSeason(Date date) {
int day = 0;
Date[] seasonDates = getSeasonDate(date);
Calendar c = Calendar.getInstance();
c.setTime(date);
int month = c.get(Calendar.MONTH); <PRE class=java name="code"> //季度第一個月
if(month == Calendar.JANUARY || month == Calendar.APRIL || month == Calendar.JULY || month == Calendar.OCTOBER) {
day = getPassDayOfMonth(seasonDates[0]);
} else if(month == Calendar.FEBRUARY || month == Calendar.MAY || month == Calendar.AUGUST || month == Calendar.NOVEMBER) { //季度第二個月
day = getDayOfMonth(seasonDates[0]) + getPassDayOfMonth(seasonDates[1]);
} else if(month == Calendar.MARCH || month == Calendar.JUNE || month == Calendar.SEPTEMBER || month == Calendar.DECEMBER) { //季度第三個月
day = getDayOfMonth(seasonDates[0]) + getDayOfMonth(seasonDates[1]) + getPassDayOfMonth(seasonDates[2]);
}
return day;
}
/**
* 取得季度月
*
* @param date
* @return
*/
public static Date[] getSeasonDate(Date date) {
Date[] season = new Date[3];
Calendar c = Calendar.getInstance();
c.setTime(date);
int nSeason = getSeason(date);
if(nSeason == 1) {//第一季度
c.set(Calendar.MONTH, Calendar.JANUARY);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.FEBRUARY);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.MARCH);
season[2] = c.getTime();
} else if(nSeason == 2) {//第二季度
c.set(Calendar.MONTH, Calendar.APRIL);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.MAY);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.JUNE);
season[2] = c.getTime();
} else if(nSeason == 3) {//第三季度
c.set(Calendar.MONTH, Calendar.JULY);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.AUGUST);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.SEPTEMBER);
season[2] = c.getTime();
} else if(nSeason == 4) {//第四季度
c.set(Calendar.MONTH, Calendar.OCTOBER);
season[0] = c.getTime();
c.set(Calendar.MONTH, Calendar.NOVEMBER);
season[1] = c.getTime();
c.set(Calendar.MONTH, Calendar.DECEMBER);
season[2] = c.getTime();
}
return season;
}
/**
*
* 1 第一季度 2 第二季度 3 第三季度 4 第四季度
*
* @param date
* @return
*/
public static int getSeason(Date date) {
int season = 0;
Calendar c = Calendar.getInstance();
c.setTime(date);
int month = c.get(Calendar.MONTH);
switch (month) {
case Calendar.JANUARY:
case Calendar.FEBRUARY:
case Calendar.MARCH:
season = 1;
break;
case Calendar.APRIL:
case Calendar.MAY:
case Calendar.JUNE:
season = 2;
break;
case Calendar.JULY:
case Calendar.AUGUST:
case Calendar.SEPTEMBER:
season = 3;
break;
case Calendar.OCTOBER:
case Calendar.NOVEMBER:
case Calendar.DECEMBER:
season = 4;
break;
default:
break;
}
return season;
}
public static void main(String[] args) {
String strDate = "2010-03-26";
Date date = parseDate(strDate);
System.out.println(strDate + " 是一年的第幾周？" + getWeekOfYear(date));
System.out.println(strDate + " 所在周起始結束日期？" + getWeekBeginAndEndDate(date, "yyyy年MM月dd日"));
System.out.println(strDate + " 所在周周一是？" + formatDate(getMondayOfWeek(date)));
System.out.println(strDate + " 所在周周日是？" + formatDate(getSundayOfWeek(date)));
System.out.println(strDate + " 當月第一天日期？" + formatDate(getFirstDateOfMonth(date)));
System.out.println(strDate + " 當月最后一天日期？" + formatDate(getLastDateOfMonth(date)));
System.out.println(strDate + " 當月天數？" + getDayOfMonth(date));
System.out.println(strDate + " 當月已過多少天？" + getPassDayOfMonth(date));
System.out.println(strDate + " 當月剩余多少天？" + getRemainDayOfMonth(date));
System.out.println(strDate + " 所在季度第一天日期？" + formatDate(getFirstDateOfSeason(date)));
System.out.println(strDate + " 所在季度最后一天日期？" + formatDate(getLastDateOfSeason(date)));
System.out.println(strDate + " 所在季度天數？" + getDayOfSeason(date));
System.out.println(strDate + " 所在季度已過多少天？" + getPassDayOfSeason(date));
System.out.println(strDate + " 所在季度剩余多少天？" + getRemainDayOfSeason(date));
System.out.println(strDate + " 是第幾季度？" + getSeason(date));
System.out.println(strDate + " 所在季度月份？" + formatDate(getSeasonDate(date)[0], "yyyy年MM月") + "/" + formatDate(getSeasonDate(date)[1], "yyyy年MM月") + "/" + formatDate(getSeasonDate(date)[2], "yyyy年MM月"));
}
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