java中常用的與時間有關(guān)的方法

1、java中常用的與時間有關(guān)的方法（string與date轉(zhuǎn)化，岀生日期轉(zhuǎn)年齡，時間計算周次等）java view plain copy/* 計算兩個日期之間相差的天數(shù)* param smdate 較小的時間* param bdate 較大的時間*return 相差天數(shù)* throws ParseException*/public static int DaysMinus(DatestartDate,Date endDate) throws ParseExceptionSimpleDateFormatsdf=newSimpleDateFormat(yyyy-MM-dd);startDate= s

2、df.parse(sdf.format(startDate);endDate =sdf.parse(sdf.format(endDate);Calendar cal between_days=(endTime-startTime)/(1000*3600*24);= Calendar.getInstance(); cal.setTime(startDate);= Calendar.getInstance(); cal.setTime(startDate);cal.getTimeInMillis();cal.setTime(endDate);cal.getTimeInMillis();long s

3、tartTime =long endTime =longreturnInteger.parseInt(String.valueOf(between_days);/* 字符串的日期格式的計算相差天數(shù) *param 開始日期：startDate *param 結(jié)束日期： endDate *return 相差天數(shù) */ public static int DaysMinus(String startDate,String endDate) throws ParseExceptionSimpleDateFormatsdf=new SimpleDateFormat(yyyy-MM-dd);Calenda

4、r cal = Calendar.getInstance();cal.setTime(sdf.parse(startDate);longstartTime = cal.getTimeInMillis();cal.setTime(sdf.parse(endDate);long endTime= cal.getTimeInMillis();long between_days =(endTime-startTime)/(1000*3600*24);returnInteger.parseInt(String.valueOf(between_days); /* String 類型日期轉(zhuǎn) Date * p

5、aram datereturn * throws ParseException */public static Date string2Date(String date) throws ParseExceptionSimpleDateFormat sdf = newSimpleDateFormat(yyyy-MM-dd);DateresultDate = sdf.parse(date);returnresultDate; /* Date 類型日期轉(zhuǎn) Stringparam date * return * throws ParseException */ public static String

6、 date2String(Date date) throwsParseException SimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd); String currentTime = sdf.format(date); return currentTime; /* * 日期相加 * param date * param days * return */ public static Date dateAdd(Date date, int days) Calendar calendar = new GregorianCalendar()

7、; calendar.setTime(date);calendar.add(calendar.DATE, days); date = calendar.getTime(); return date; /* * String 類型日期相加 * param date * param days * return * throws ParseException */ public static Date dateAdd(String date, int days) throws ParseException Date Datedate = string2Date(date); Calendar cal

8、endar = new GregorianCalendar(); calendar.setTime(Datedate);calendar.add(calendar.DATE, days); Datedate = calendar.getTime(); return Datedate; /* * 獲取當(dāng)前日期的周次* 07：星期日, 01：星期一, 02：星期二, 03：星期三, 04：星期四, 05： 星期五, 06：星期六* author 秦海 *param dt * return */ public static String DayOfWeek2MatchDict(Date dt) St

9、ring weekDays = 07, 01, 02, 03, 04, 05, 06; Calendar cal = Calendar.getInstance();cal.setTime(dt); int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK) - 1; if (dayOfWeek 0) dayOfWeek = 0; return weekDaysdayOfWeek; /* * 獲取系統(tǒng) 當(dāng)前日期 date 類型 * return * throws ParseException */ public static Date getDateSysDate

10、() throws ParseException Date now = new Date();SimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd); String sysDate = sdf.format(now); Date resultDate = sdf.parse(sysDate); return resultDate; /* * 按照傳入的格式獲取系統(tǒng) date 類型世間 * -年-月-日 時:分:秒.毫秒* yyyy-MM-ddHH:mm:ss.fff:使用24小時制格式化日期*yyyy-MM-dd hh:mm:ss.fff

11、:使用12小時制格式化日期 * yyyy-MM-dd HH:mm:ss zzz * yyyy-MM-ddHH:mm:ss.ff zzz * yyyy-MM-dd HH:mm:ss.fff zzz * yyyy-MM-dd HH:mm:ss.ffff zzz * param format * return * throws ParseException */ public static Date getDateSysDate(String format) throws ParseException Date now = new Date(); SimpleDateFormat sdf = new

12、 SimpleDateFormat(format); String sysDate = sdf.format(now);DateresultDate = sdf.parse(sysDate);returnresultDate; /* * 根據(jù)出生日期獲取人的 年齡 * * param strBirthDate(yyyy-mm-dd or yyyy/mm/dd) * return */ public static String getPersonAgeByBirthDate(Date dateBirthDate) if (dateBirthDate = null) return ; Simple

13、DateFormat dateFormat = new SimpleDateFormat(yyyy-MM-dd); String strBirthDate=dateFormat.format(dateBirthDate);Calendar c =Calendar c =Calendar.getInstance();int year =c.get(Calendar.YEAR);int month =c.get(Calendar.MONTH)+1;c.get(Calendar.DATE);Calendar.getInstance();int year =c.get(Calendar.YEAR);i

14、nt month =c.get(Calendar.MONTH)+1;c.get(Calendar.DATE);int day =/計算年齡intage = year - Integer.parseInt(strBirthDate.substring(0, 4) - 1; if (Integer.parseInt(strBirthDate.substring(5,7) month) age+; else if (Integer.parseInt(strBirthDate.substring(5,7)= month & Integer.parseInt(strBirthDate.substring

15、(8,10) = day) age+; return String.valueOf(age); /* * 根據(jù) 出生日期獲取人的年齡 * * param strBirthDate(yyyy-mm-dd or yyyy/mm/dd) * return */ public static String getPersonAgeByBirthDate(StringstrBirthDate)if(.equals(strBirthDate) | strBirthDate =null) return ;/讀取當(dāng)前日期 Calendar c=Calendar.getInstance();int year =c

16、.get(Calendar.YEAR);int month =c.get(Calendar.MONTH)+1;int day =c.get(Calendar.DATE);/計算年齡intage = year - Integer.parseInt(strBirthDate.substring(0, 4) -1; if (Integer.parseInt(strBirthDate.substring(5,7)(Integer.parseInt(strBirthDate.substring(5,7)= month & Integer.parseInt(strBirthDate.substring(8

17、,10) = day) age+; return String.valueOf(age); /* * 獲取 當(dāng)前日期是星期幾 * 0-星期日，1-星期一, 2-星期二, 3-星期三, 4-星期四, 5-星期五, 6-星期六 * param dt * return*/ public staticint getDayOfWeek(Date dt) Calendar cal =Calendar.getInstance();cal.setTime(dt);int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK) - 1; return dayOfWeek; /* 獲取

18、當(dāng)前日期是星期幾 * 0-星期日, 1-星期一, 2-星期二, 3-星 期三, 4-星期四, 5-星期五, 6-星期六* param:strDate */ public static intgetDayOfWeek(String strDate)Stringformat=yyyy-MM-dd;/可以方便地修改日期格式SimpleDateFormat dateFormat = newSimpleDateFormat(format);Date date = null;try date = dateFormat.parse(strDate);Calendar c = Calendar.getInstance();c.setTime(date);int dayOfWeek=c.get(Calendar.DAY_OF_WEEK)- 1;e.printStackTrace(); return -1; /* * 獲取系統(tǒng)當(dāng)前時間return dayOfWeek; catch (ParseException e)*/ pub