java中常用的與時(shí)間有關(guān)的方法

1、startDateendDate =Calendar callong startTime =long endTime =longjava 中常用的與時(shí)間有關(guān)的方法 （string 與 date 轉(zhuǎn)化， 出生 日期轉(zhuǎn)年齡，時(shí)間計(jì)算周次等）java view plain copy /* * 計(jì)算兩 個(gè)日期之間相差的天數(shù) * param smdate 較小的 時(shí)間 * param bdate 較大的時(shí)間 * return 相差天數(shù) * throws ParseException */ public static int DaysMinus(Date startDate,Date endDate) t

2、hrows ParseException SimpleDateFormat sdf=newSimpleDateFormat(yyyy-MM-dd) = sdf.parse(sdf.format(startDate); sdf.parse(sdf.format(endDate);= Calendar.getInstance(); cal.setTime(startDate); cal.getTimeInMillis(); cal.setTime(endDate); cal.getTimeInMillis();between_days=(endTime-startTime)/(1000*3600*

3、24);returnInteger.parseInt(String.valueOf(between_days); /* 字符串的日期格式的計(jì)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 ParseException SimpleDateFormat sdf=new SimpleDateFormat(yyyy-MM-dd); Calendar cal = Calendar.ge

4、tInstance(); 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); return Integer.parseInt(String.valueOf(between_days); /* String 類型日期轉(zhuǎn) Date* param date* retur

5、n* throws ParseException*/public static Date string2Date(String date) throws ParseException SimpleDateFormat sdf = new SimpleDateFormat(yyyy-MM-dd); Date resultDate = sdf.parse(date); return resultDate; /* * Date 類型日期轉(zhuǎn) String * param date * return * throws ParseException */public static String date2

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

7、ate);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 DatedateAdd(String date, int days) throws ParseException Date Datedate = string2Date(date); Calendar calendar = new GregorianC

8、alendar(); 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 ：String DayOfWeek2MatchDict(Date dt) StringweekDays = 07, 01, 02, 03, 04, 05, 06;Calendar cal = Calendar.getIns

9、tance(); cal.setTime(dt); int dayOfWeek = cal.get(Calendar.DAY_OF_WEEK) - 1; if getDateSysDate() throws ParseException(dayOfWeek < 0)dayOfWeek =0; return weekDaysdayOfWeek; /*獲取系統(tǒng)當(dāng)前日期 date 類型return * throwsParseException*/ public static DateDate now = new Date();SimpleDateFormat sdf = new SimpleD

10、ateFormat(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(shí):分:秒.毫秒* yyyy-MM-ddHH:mm:ss.fff: 使用 24 小時(shí)制格式化日期 *yyyy-MM-dd hh:mm:ss.fff: 使用 12 小時(shí)制格式化日期 * yyyy-MM-dd HH:mm:ss zzz* yyyy-MM-ddHH:mm:ss.ff zzz* yyyy-MM-

11、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 SimpleDateFormat(format); String sysDate = sdf.format(now);DateresultDate = sdf.pa

12、rse(sysDate);returnresultDate; /* * 根據(jù)出生日期獲取人的 年齡 * param strBirthDate(yyyy-mm-dd oryyyy/mm/dd) * return */public staticint year =int month = int day =/計(jì)算年齡intString getPersonAgeByBirthDate(Date dateBirthDate) if (dateBirthDate = null) return ; SimpleDateFormat dateFormat = new SimpleDateFormat(yyyy

13、-MM-dd); String strBirthDate=dateFormat.format(dateBirthDate); /讀取當(dāng)前日期Calendar c =Calendar.getInstance(); c.get(Calendar.YEAR); c.get(Calendar.MONTH)+1; c.get(Calendar.DATE);age = year - Integer.parseInt(strBirthDate.substring(0, 4) - 1; if (Integer.parseInt(strBirthDate.substring(5,7) < month) a

14、ge+; else if(Integer.parseInt(strBirthDate.substring(5,7)= month && Integer.parseInt(strBirthDate.substring(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 StringgetPersonAgeByBirthDate(StringstrBir

15、thDate)if(.equals(strBirthDate) | strBirthDate=null) return ;/讀取當(dāng)前日期 Calendar c =Calendar.getInstance();int year =c.get(Calendar.YEAR);int month =c.get(Calendar.MONTH)+1;int day =c.get(Calendar.DATE);/計(jì)算年齡intage = year - Integer.parseInt(strBirthDate.substring(0, 4) -1; if (Integer.parseInt(strBirth

16、Date.substring(5,7) < month) age+; else if(Integer.parseInt(strBirthDate.substring(5,7)= month && Integer.parseInt(strBirthDate.substring(8,10) <= day)age+; return String.valueOf(age); /* * 獲取 當(dāng)前日期是星期幾 <br>* 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* retu

17、rn */ 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(S

18、tring strDate) String format=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); inte.printStackTrace(); return -1; /* * 獲取系統(tǒng)當(dāng)前時(shí)間return dayOfWeek; catch (ParseException e)*/ public static Str