java date 实例_Java Date 和 Calendar 实例

布满荆棘的人生 2022-11-06 04:55 247阅读 0赞

Java 之 Date 和 Calendar 实例

package com.homer.learn;

import java.text.DateFormat;

import java.text.ParsePosition;

import java.text.SimpleDateFormat;

import java.util.Calendar;

import java.util.Date;

import java.util.GregorianCalendar;

public class TimeTest \{

public static void main(String\[\] args) \{

TimeTest tt = new TimeTest();

System.out.println("\\n当前日期： ");

System.out.println(tt.getNowTime());// 获取当前时间

System.out.println(tt.getNowTime2());// 获取当前时间

System.out.println(tt.getNowTime3());// 获取当前时间

System.out.println("\\n计算周： ");

System.out.println(tt.getDaysOfNow2SundayInWeek());// 获取当前日期与本周日的相差天数

System.out.println(tt.getDateOfMondayInWeek());// 获取本周一的日期

System.out.println(tt.getDateOfSaturdayInWeek());// 获取本周六的日期

System.out.println(tt.getDateOfSaturdayInNextWeek());// 获取下周一的日期

System.out.println(tt.getDateOfSaturdayInLastWeek());// 获取上周一的日期

System.out.println("\\n计算月： ");

System.out.println(tt.getFirstDayOfMonth());// 获取当月的第一天

System.out.println(tt.getLastDayOfMonth());// 获取当月最后一天

System.out.println(tt.getFirstDayOfPreviousMonth());// 获取上月第一天

System.out.println(tt.getLastDayOfPreviousMonth());// 获取上月最后一天

System.out.println(tt.getFirstDayOfNextMonth());// 获取下月第一天

System.out.println(tt.getLastDayOfNextMonth());// 获取下月最后一天

System.out.println("\\n计算年： ");

System.out.println(tt.getFirstDayOfYear());// 获取本年的第一天

System.out.println(tt.getLastDayOfYear());// 获取本年最后一天

System.out.println(tt.getFirstDayOfPreviousYear());// 获取上年的第一天

System.out.println(tt.getLastDayOfPreviousYear());// 获取上年最后一天

System.out.println(tt.getFirstDayOfNextYear());// 获取下年的第一天

System.out.println(tt.getLastDayOfNextYear());// 获取下年最后一天

System.out.println(tt.getDaysOfYear());// 获取本年的天数

System.out.println("\\n计算季度： ");

System.out.println(tt.getSeasonOfMonth()); // 获取当前月的季度

System.out.println(tt.getLastDayOfNow());// 获取当前天所在月份的天数

System.out.println(tt.isLeapYear(2012)); // 判断是否是润年

System.out.println("\\n日期格式转换与计算： ");

System.out.println(tt.getDateFromStr("2012-06-20"));// 将字符串时间格式 yyyy-MM-dd，转换成Date类型

System.out.println(tt.getWeek("2012-06-20"));// 根据一个日期，返回是星期几的字符串

System.out.print("2012-06-02 -> 2012-06-12间隔天数:");// 计算两个日期间的间隔天数

System.out.println(tt.getDaysFromTwoDate("2012-06-02", "2012-06-12"));

// 获取当前时间

public String getNowTime() \{

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Date now = new Date();

return sDateFormat.format(now);

public String getNowTime2() \{

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

Date now = new Date(System.currentTimeMillis());

return sDateFormat.format(now);

public String getNowTime3() \{

StringBuilder strBuildNow = new StringBuilder();

Calendar calendar = Calendar.getInstance();

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

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

int day = calendar.get(Calendar.DAY\_OF\_MONTH);

int hour = calendar.get(Calendar.HOUR\_OF\_DAY);

int minute = calendar.get(Calendar.MINUTE);

int second = calendar.get(Calendar.SECOND);

int millissecond = calendar.get(Calendar.MILLISECOND);

strBuildNow.append(year + "-");

strBuildNow.append(month + "-");

strBuildNow.append(day + " ");

strBuildNow.append(hour + ":");

strBuildNow.append(minute + ":");

strBuildNow.append(second + ".");

strBuildNow.append(millissecond);

return strBuildNow.toString();

// 获取当前日期与本周日的相差天数

public int getDaysOfNow2SundayInWeek() \{

Calendar calendar = Calendar.getInstance();

int dayOfWeek = calendar.get(Calendar.DAY\_OF\_WEEK) - 1;// 减一天，周一为1，符合中国人习惯。Sunday - 1; Monday - 2; Saturday - 7

if(dayOfWeek == 0) \{// 周日

return 0;

\} else \{

return 0 - dayOfWeek;

// 获取本周一的日期

public String getDateOfMondayInWeek()\{

int day = this.getDaysOfNow2SundayInWeek() + 1;// 加1，即周一离本周日的间隔天数

GregorianCalendar gCalendar = new GregorianCalendar();

gCalendar.add(GregorianCalendar.DATE, day);// 计算与本周一相差的时间间隔

Date curDay = gCalendar.getTime();

DateFormat dateFormat = DateFormat.getInstance();

String dateOfMonday = dateFormat.format(curDay);

return dateOfMonday;

// 获取本周六的日期

public String getDateOfSaturdayInWeek()\{

int day = this.getDaysOfNow2SundayInWeek() + 6;// 加6，即周六离本周日的间隔天数

GregorianCalendar gCalendar = new GregorianCalendar();

gCalendar.add(GregorianCalendar.DATE, day);// 计算与本周六相差的时间间隔

Date curDay = gCalendar.getTime();

DateFormat dateFormat = DateFormat.getInstance();

String dateOfMonday = dateFormat.format(curDay);

return dateOfMonday;

// 获取上周一的日期

public String getDateOfSaturdayInLastWeek()\{

int day = this.getDaysOfNow2SundayInWeek() - 1;// 减1，即上周一离本周日的间隔天数

GregorianCalendar gCalendar = new GregorianCalendar();

gCalendar.add(GregorianCalendar.DATE, day);// 计算与上周一相差的时间间隔

Date curDay = gCalendar.getTime();

DateFormat dateFormat = DateFormat.getInstance();

String dateOfMonday = dateFormat.format(curDay);

return dateOfMonday;

// 获取下周一的日期

public String getDateOfSaturdayInNextWeek()\{

int day = this.getDaysOfNow2SundayInWeek() + 8;// 加8，即下周一离本周日的间隔天数

GregorianCalendar gCalendar = new GregorianCalendar();

gCalendar.add(GregorianCalendar.DATE, day);// 计算与下周一相差的时间间隔

Date curDay = gCalendar.getTime();

DateFormat dateFormat = DateFormat.getInstance();

String dateOfMonday = dateFormat.format(curDay);

return dateOfMonday;

// 获取当月第一天

public String getFirstDayOfMonth() \{

String strFirstDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DATE, 1);// 设置当前月的1号

strFirstDay = sDateFormat.format(calendar.getTime());

return strFirstDay;

// 获取当月最后一天

public String getLastDayOfMonth() \{

String strLastDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DATE, 1);// 设置当前月的1号

calendar.add(Calendar.MONDAY, 1);// 加一个月，变为下月的1号

calendar.add(Calendar.DATE, -1);// 减去一天，变为当前月的最后一天

strLastDay = sDateFormat.format(calendar.getTime());

return strLastDay;

// 获取上月第一天

public String getFirstDayOfPreviousMonth() \{

String strFirstDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DATE, 1);// 设置当前月的1号

calendar.add(Calendar.MONDAY, -1);// 减一个月，变为上月的1号

strFirstDay = sDateFormat.format(calendar.getTime());

return strFirstDay;

// 获取上月最后一天

public String getLastDayOfPreviousMonth() \{

String strLastDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DATE, 1);// 设置当前月的1号

calendar.add(Calendar.DATE, -1);// 减一天，变为上月的1号

strLastDay = sDateFormat.format(calendar.getTime());

return strLastDay;

public String getLastDayOfPreviousMonth2() \{

String strLastDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.MONDAY, -1);// 减一个月

calendar.set(Calendar.DATE, 1);// 设置当前月的1号

calendar.roll(Calendar.DATE, -1);// 把日期回滚一天，也就是本月最后一天

strLastDay = sDateFormat.format(calendar.getTime());

return strLastDay;

// 获取下月第一天

public String getFirstDayOfNextMonth() \{

String strFirstDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.MONTH, 1);// 加一个月

calendar.set(Calendar.DATE, 1);// 设置当前月第一天

strFirstDay = sDateFormat.format(calendar.getTime());

return strFirstDay;

// 获取下月最后一天

public String getLastDayOfNextMonth() \{

String strLastDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DATE, 1);// 设置当前月的1号

calendar.add(Calendar.MONDAY, 2);// 加两个月，变为下下月的1号

calendar.add(Calendar.DATE, -1);// 减一天，变为下月的最后一天

strLastDay = sDateFormat.format(calendar.getTime());

return strLastDay;

public String getLastDayOfNextMonth2()\{

String strLastDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.MONTH, 1);// 加1个月

calendar.set(Calendar.DATE, 1);// 把日期设置为当月第1天

calendar.roll(Calendar.DATE, -1);// 日期回滚1天，也就是本月最后1天

strLastDay = sDateFormat.format(calendar.getTime());

return strLastDay;

// 获取本年的第一天

public String getFirstDayOfYear()\{

String strFirstDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DAY\_OF\_YEAR, 1);// 设置当年第一天

strFirstDay = sDateFormat.format(calendar.getTime());

return strFirstDay;

// 获取本年的最后一天

public String getLastDayOfYear()\{

String strLastDay = "";

Calendar calendar = Calendar.getInstance();

strLastDay = calendar.get(Calendar.YEAR) + "-12-31";

return strLastDay;

// 获取上年的第一天

public String getFirstDayOfPreviousYear()\{

String strFirstDay = "";

Calendar calendar = Calendar.getInstance();

strFirstDay = (calendar.get(Calendar.YEAR) - 1) + "-01-01";

return strFirstDay;

// 获取上年的最后一天

public String getLastDayOfPreviousYear()\{

String strLastDay = "";

Calendar calendar = Calendar.getInstance();

strLastDay = (calendar.get(Calendar.YEAR) - 1) + "-12-31";

return strLastDay;

// 获取下年的第一天

public String getFirstDayOfNextYear()\{

String strFirstDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.YEAR, 1);// 加一年

calendar.set(Calendar.DAY\_OF\_YEAR, 1);// 设置当年第一天

strFirstDay = sDateFormat.format(calendar.getTime());

return strFirstDay;

// 获取下年的最后一天

public String getLastDayOfNextYear()\{

String strLastDay = "";

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

Calendar calendar = Calendar.getInstance();

calendar.add(Calendar.YEAR, 1);// 加一年

calendar.set(Calendar.DAY\_OF\_YEAR, 1);// 设置当年第一天

calendar.roll(Calendar.DAY\_OF\_YEAR, -1);// 回滚到当年最后一天

strLastDay = sDateFormat.format(calendar.getTime());

return strLastDay;

// 获取本年的天数

public String getDaysOfYear()\{

int year = 0;

int days = 0;

Calendar calendar = Calendar.getInstance();

calendar.set(Calendar.DAY\_OF\_YEAR, 1);// 设置日期为当年第一天

calendar.roll(Calendar.DAY\_OF\_YEAR, -1);// 把日期回滚一天

year = calendar.get(Calendar.YEAR);

days = calendar.get(Calendar.DAY\_OF\_YEAR);

return (days + " in " + year);

// 获取当前月的季度

public String getSeasonOfMonth()\{

String strSeason = "";

int year, month, day;

int season = 1;

int array\[\]\[\] = new int\[\]\[\]\{ \{1,2,3\}, \{4,5,6\}, \{7,8,9\}, \{10,11,12\} \};

Calendar calendar = Calendar.getInstance();

year = calendar.get(Calendar.YEAR);

month = calendar.get(Calendar.MONDAY) + 1;

day = calendar.get(Calendar.DAY\_OF\_MONTH);

switch (month) \{

case 1:

case 2:

case 3:

season = 1;

break;

case 4:

case 5:

case 6:

season = 2;

break;

case 7:

case 8:

case 9:

season = 3;

break;

case 10:

case 11:

case 12:

season = 4;

break;

default:

season = 1;

break;

int start\_month = array\[season-1\]\[0\];

int end\_month = array\[season-1\]\[2\];

strSeason = year + "-" + month + "-" +day;

strSeason += " in \[ " + year + "-" + start\_month + " : " + year + "-" + end\_month + " \]";

return strSeason;

// 获取当前天所在月份的天数

public String getLastDayOfNow()\{

String strLastDay = "";

int year, month, day;

int days = 0;

Calendar calendar = Calendar.getInstance();

year = calendar.get(Calendar.YEAR);

month = calendar.get(Calendar.MONTH) + 1;

day = calendar.get(Calendar.DAY\_OF\_MONTH);

switch (month) \{

case 1:

case 3:

case 5:

case 7:

case 8:

case 10:

case 12:

days = 31;

break;

case 4:

case 6:

case 9:

case 11:

days = 30;

break;

case 2:

if (isLeapYear(year)) \{

days = 29;

\} else \{

days = 28;

break;

default:

days = 0;

break;

strLastDay = days + " in \[ " + year + "-" + month + "-" + day + " \]";

return strLastDay;

// 判断是否是润年

public boolean isLeapYear(int year)\{

return (year%4 == 0 && year%100 != 0) || (year%400 == 0);

// 将字符串时间格式 yyyy-MM-dd，转换成Date类型

public Date getDateFromStr(String txtDate) \{

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

ParsePosition pos = new ParsePosition(0);

Date date = sDateFormat.parse(txtDate, pos);

return date;

// 根据一个日期，返回是星期几的字符串

public String getWeek(String txtDate) \{

Date date = getDateFromStr(txtDate);

Calendar calendar = Calendar.getInstance();

calendar.setTime(date);

String week = new SimpleDateFormat("EEEE").format(date);

return week;

// 计算两个日期间的间隔天数

public long getDaysFromTwoDate(String txtDate1, String txtDate2) \{

if(txtDate1 == null || txtDate1.equals("")) \{

return 0;

if(txtDate2 == null || txtDate2.equals("")) \{

return 0;

SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd");

long days = 0;

try \{

Date date1 = sDateFormat.parse(txtDate1);

Date date2 = sDateFormat.parse(txtDate2);

days = (date2.getTime() - date1.getTime())/(24\*60\*60\*1000);// 通过getTime()方法，把时间Date转换成毫秒格式Long类型，进行计算

\} catch (Exception e) \{

System.out.println(e.getMessage());

return days;

运行结果：

当前日期：

2012-03-07

2012-03-07 12:30:11

2012-3-7 12:30:11.101

计算周：

\-3

3/5/12 12:30 PM

3/10/12 12:30 PM

3/12/12 12:30 PM

3/3/12 12:30 PM

计算月：

2012-03-01

2012-03-31

2012-02-01

2012-02-29

2012-04-01

2012-04-30

计算年：

2012-01-01

2012-12-31

2011-01-01

2011-12-31

2013-01-01

2013-12-31

366 in 2012

计算季度：

2012-3-7 in \[ 2012-1 : 2012-3 \]

31 in \[ 2012-3-7 \]

true

日期格式转换与计算：

Wed Jun 20 00:00:00 CST 2012

Wednesday

2012-06-02 -> 2012-06-12间隔天数:10

参考推荐：

java date 实例_Java Date 和 Calendar 实例

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