最新51CTO-Java时间操作总结代码版汇总

51C T O-J a v a时间操作总结代码版

直接在main函数中测试方法即可

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.tulip.StringUtil;

public class TimeUtils extends https://www.360docs.net/doc/377892472.html,ng.time.DateUtils

{

public static final SimpleDateFormat dateFormat = new SimpleDateFormat(yyyy-MM-dd HHmmss);

public static final SimpleDateFormat dateFormatHiddenHour = new SimpleDateFormat(yyyy-MM-dd);

public static final String getFormatedNowTime()

{

return dateFormat.format(new Date());

}

格式化时间(yyyy-MM-dd HHmmss)

@param date

@return

public static final String getFormatedTime(Date date)

{

return dateFormat.format(date);

}

格式化时间

@param date

@return

public static final String getFormatedTime(SimpleDateFormat dateFormat,Date date)

{

return dateFormat.format(date);

}

格式化时间(yyyy-MM-dd)

@param date

@return

public static final String getFormatedTimeHiddenHour(Date date)

{

return dateFormatHiddenHour.format(date);

}

长整型时间转换(yyyy-MM-dd HHmmss)

@param timestamp

@return

public static final String getFormatedTime(Long timestamp)

{

Date date = new Date(timestamp);

return dateFormat.format(date);

}

显示完整时间

public static String getRecentDateString(int offset)

{

offset 与当前日期的偏移量如-1代表昨天

Date date = new Date();

date = new Date(date.getTime() + offset 86400000);

return dateFormat.format(date);

}

public static String getRecentDateString(Date date,int offset)

{

offset 与当前日期的偏移量如-1代表昨天

date = new Date(date.getTime() + offset 86400000);

return dateFormat.format(date);

}

只显示年月日部份

public static String getRecentDateExcludeHourString(int offset)

{

offset 与当前日期的偏移量如-1代表昨天

Date date = new Date();

date = new Date(date.getTime() + offset 86400000);

return dateFormatHiddenHour.format(date);

}

public static String getRecentDateExcludeHourString(String str,int offset) throws ParseException

{

offset 与当前日期的偏移量如-1代表昨天

Date date = dateFormatHiddenHour.parse(str);

date = new Date(date.getTime() + offset 86400000);

return dateFormatHiddenHour.format(date);

}

public static String getRecentDateFormatString(SimpleDateFormat dateFormat,String str,int offset) throws ParseException

{

offset 与当前日期的偏移量如-1代表昨天

Date date = dateFormat.parse(str);

date = new Date(date.getTime() + offset 86400000);

return dateFormat.format(date);

}

STRING日期转化为DATE型

@param sDt

@return

@throws ParseException

public static Date stringToDate(String sDt) throws ParseException

{

return dateFormat.parse(sDt);

}

public static Date stringToDateExcludeHour(String sDt) throws ParseException {

return dateFormatHiddenHour.parse(sDt);

}

public static Date stringToFormatDate(SimpleDateFormat dateFormat,String sDt) throws ParseException

{

return dateFormat.parse(sDt);

}

返回两个时间差，毫秒

@param now

@param returnDate

@return

public static long daysBetween(Date now, Date returnDate)

{

Calendar cNow = Calendar.getInstance();

Calendar cReturnDate = Calendar.getInstance();

cNow.setTime(now);

cReturnDate.setTime(returnDate);

setTimeToMidnight(cNow);

setTimeToMidnight(cReturnDate);

long todayMs = cNow.getTimeInMillis();

long returnMs = cReturnDate.getTimeInMillis();

long intervalMs = todayMs - returnMs;

return intervalMs;

}

毫秒转成实际天数

@param intervalMs

@return

public static int millisecondsToDays(long intervalMs)

{

return (int) (intervalMs (1000 86400));

}

设置时间从0开始

@param calendar

public static void setTimeToMidnight(Calendar calendar)

{

calendar.set(Calendar.HOUR_OF_DAY, 0);

calendar.set(Calendar.MINUTE, 0);

calendar.set(Calendar.SECOND, 0);

}

月份的最后一天

@param ymStr 只包含年和月的字符串

@return

public static int getLastDayOfMonth(String ymStr){

ymStr = StringUtils.getFormatDateStr(ymStr);

int year = Integer.parseInt(ymStr.substring(0,ymStr.indexOf(-)));

int month = Integer.parseInt(ymStr.substring(ymStr.indexOf(-)+1));

Calendar c = Calendar.getInstance();

c.set(Calendar.YEAR, year);

c.set(Calendar.MONTH, month-1);

return c.getActualMaximum(Calendar.DAY_OF_MONTH);

}

月份的最后一天

@param year

@param month

@return

public static int getLastDayOfMonth(int year, int month)

{

Calendar c = Calendar.getInstance();

c.set(Calendar.YEAR, year);

c.set(Calendar.MONTH, month);

c.set(Calendar.DATE, 1);

c.add(Calendar.DATE, -1);

System.out.println(c.get(Calendar.DATE)+_+c.get(Calendar.MONTH)); return c.getActualMaximum(Calendar.DAY_OF_MONTH);

}

月份的第一天

@param year

@param month

@return

public static int getFirstDayOfMonth(int year, int month)

{

Calendar c = Calendar.getInstance();

c.set(Calendar.YEAR, year);

c.set(Calendar.MONTH, month-1);

return (c.getActualMinimum(Calendar.DAY_OF_MONTH));

}

两个时间相差的月份

@param begin

@param end

@return

public static int getDiffMonth(String begin, String end)

{

try

{

SimpleDateFormat myFormatter = new SimpleDateFormat(yyyy-MM-dd); java.util.Date date1 = myFormatter.parse(end);

java.util.Date date2 = myFormatter.parse(begin);

int y1 = (date1.getYear() - date2.getYear());

int m2 = y1 12 + (date1.getMonth() - date2.getMonth());

return m2;

} catch (Exception e)

{

return 0;

}

}

计算两个日期相隔的天数

public static int getDiffDay(String firstString,String secondString){

SimpleDateFormat df=new SimpleDateFormat(yyyy-MM-dd);

Date firstDate=null;

Date secondDate=null;

try{

firstDate=df.parse(firstString);

secondDate=df.parse(secondString);

} catch(Exception e){

日期型字符串格式错误

}

int nDay=(int)((secondDate.getTime()-firstDate.getTime())(2460601000)); return nDay;

}

日期加法

@param when 被计算的日期

@param field the time field. 在Calendar中定义的常数，例如Calendar.DATE

@param amount 加数

@return 计算后的日期

public static Date add(Date when, int field, int amount) { Calendar calendar = Calendar.getInstance();

calendar.setTime(when);

calendar.add(field,amount);

return calendar.getTime();

}

计算给定的日期加上给定的天数。

@param when 给定的日期

@param amount 给定的天数

@return 计算后的日期

public static Date addDays(Date when, int amount) {

return add(when,Calendar.DAY_OF_YEAR,amount); }

计算给定的日期加上给定的月数。

@param when 给定的日期

@param amount 给定的月数

@return 计算后的日期

public static Date addMonths(Date when, int amount) { return add(when,Calendar.MONTH,amount);

}

获取月底

@param year 年 4位年度

@param month 月 1~12

@return 月底的Date对象。例如：2006-3-31

public static Date getMonthEnd(int year, int month) { StringBuffer sb = new StringBuffer(10);

Date date;

if (month12) {

sb.append(Integer.toString(year));

sb.append(-);

sb.append(month+1);

sb.append(-1);

date = switchStringToDate(sb.toString());

}else{

sb.append(Integer.toString(year+1));

sb.append(-1-1);

date = switchStringToDate(sb.toString());

}

date.setTime(date.getTime() - 1);

return date;

}

获取月底

@param when 要计算月底的日期

@return 月底的Date对象。例如：2006-3-31

public static Date getMonthEnd(Date when) {

Calendar calendar = Calendar.getInstance();

calendar.setTime(when);

int year = calendar.get(Calendar.YEAR);

int month = calendar.get(Calendar.MONTH)+1; return getMonthEnd(year,month);

}

获取给定日的最后一刻。

@param when 给定日

@return 最后一刻。例如：2006-4-19 235959.999 public static Date getDayEnd(Date when) {

Date date = truncate(when,Calendar.DATE);

date = addDays(date,1);

date.setTime(date.getTime() - 1);

return date;

}

获取给定日的第一刻。

@param when 给定日

@return 最后一刻。例如：2006-4-19 235959.999 public static Date getDay(Date when) {

Date date = truncate(when,Calendar.DATE);

date = addDays(date,-1);

date.setTime(date.getTime() + 1);

return date;

}

取得系统当前时间,格式为yyyy-mm-dd

public static String getCurrentDate()

{

Calendar rightNow = Calendar.getInstance();

int year = rightNow.get(Calendar.YEAR);

int month = rightNow.get(Calendar.MONTH) + 1; int day = rightNow.get(Calendar.DATE);

return year + - + month + - + day;

}

取得系统当前时间,格式为yyyy年mm月dd日 public static String getCurrentDate1()

{

Calendar rightNow = Calendar.getInstance();

int year = rightNow.get(Calendar.YEAR);

int month = rightNow.get(Calendar.MONTH) + 1; int day = rightNow.get(Calendar.DATE);

return year + 年 + month + 月 + day + 日;

}

取得系统当前时间前n个月的相对应的一天

public static String getNMonthBeforeCurrentDay(int n)

{

Calendar c = Calendar.getInstance();

c.add(Calendar.MONTH, -n);

return + c.get(Calendar.YEAR) + - + (c.get(Calendar.MONTH) + 1) + - + c.get(Calendar.DATE);

}

取得系统当前时间后n个月的相对应的一天

public static String getNMonthAfterCurrentDay(int n)

{

Calendar c = Calendar.getInstance();

c.add(Calendar.MONTH, n);

return + c.get(Calendar.YEAR) + - + (c.get(Calendar.MONTH) + 1) + - + c.get(Calendar.DATE);

}

取得系统当前时间前n天,格式为yyyy-mm-dd

public static String getNDayBeforeCurrentDate(int n)

{

Calendar c = Calendar.getInstance();

c.add(Calendar.DAY_OF_MONTH, -n);

return + c.get(Calendar.YEAR) + - + (c.get(Calendar.MONTH) + 1) + - + c.get(Calendar.DATE);

}

取得系统当前时间后n天,格式为yyyy-mm-dd

public static String getNDayAfterCurrentDate(int n)

{

Calendar c = Calendar.getInstance();

c.add(Calendar.DAY_OF_MONTH, n);

return + c.get(Calendar.YEAR) + - + (c.get(Calendar.MONTH) + 1) + - + c.get(Calendar.DATE);

}

---------------------------------------------------------------------

取过去一个时间对应的系统当年的一天

public static String getCurrentDateAfterPastDate(String sPastDate)

{

if (sPastDate != null && !sPastDate.equals())

{

Date date = switchStringToDate(sPastDate);

Calendar c = Calendar.getInstance();

c.setTime(date);

int iPastYear = c.get(Calendar.YEAR);

Calendar c1 = Calendar.getInstance();

int iCurrentYear = c1.get(Calendar.YEAR);

c.add(Calendar.YEAR, iCurrentYear - iPastYear);

return + c.get(Calendar.YEAR) + - + (c.get(Calendar.MONTH) + 1) + - + c.get(Calendar.DATE);

} else

{

return null;

}

}

将一个日期字符串转化成日期

public static Date switchStringToDate(String sDate)

{

Date date = null;

try

{

SimpleDateFormat df = new SimpleDateFormat(yyyy-MM-dd);

date = df.parse(sDate);

} catch (Exception e)

{

System.out.println(日期转换失败 + e.getMessage());

}

return date;

}

将一个日期字符串转化成Calendar

public static Calendar switchStringToCalendar(String sDate)

{

Date date = switchStringToDate(sDate);

Calendar c = Calendar.getInstance();

c.setTime(date);

return c;

}

将一个日期转化成Calendar

public static Calendar switchStringToCalendar(Date date)

{

Calendar c = Calendar.getInstance();

c.setTime(date);

return c;

}

------------------------------------------------------------------------

取得某个时间前n年的相对应的一天，不是第一天就是取最后一天

public static String getNYearBeforOneDay(String sDate,int n){ Calendar c = switchStringToCalendar(sDate);

c.add(Calendar.YEAR, -n);

return + c.get(Calendar.YEAR) + - + (c.get(Calendar.MONTH) + 1) + - + c.get(Calendar.DATE);

int year = c.get(Calendar.YEAR);

int month = (c.get(Calendar.MONTH) + 1);

int day = 1;

if(c.get(Calendar.DATE)!=1){

day = getLastDayOfMonth(year, month);

}

return + year + - + month + - + day;

}

取得某个时间前n个月的相对应的一天

public static String getNMonthBeforeOneDay(String sDate, int n)

{

Calendar c = switchStringToCalendar(sDate);

c.add(Calendar.MONTH, -n);

int year = c.get(Calendar.YEAR);

int month = (c.get(Calendar.MONTH) + 1);

return + year + - + month + - + c.get(Calendar.DATE);

}