「java周跨年」每年的跨年

本篇文章给大家谈谈java周跨年，以及每年的跨年对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

• 1、java怎样判断两个日期之间相差几周(支持跨年)?
• 2、java 列出每年的周 并设置 每年的1-7号为第一周 ，由此开始算。并找出每周对应的日期
• 3、java 如何判断 一年的最后一周是否跨年
• 4、如何跨年计算 两日期之间相隔的周数 with java8 time API
• 5、利用java计算上上周，上周，本周，下周的起止时间（可实现跨年，跨月）
• 6、java 一年的第一周从2月1号开始，获取今年的第三周的星期一，以及去年第三周的星期一 对应的日期 ？

java怎样判断两个日期之间相差几周(支持跨年)?

/**

 * 获取两个日期相差的天数

 * @param big

 * @param small

 * @return

 */

public static int getTwoDatesDifOfDay(Date big,Date small){

Calendar cal1 = Calendar.getInstance();

cal1.setTime(big);

Calendar cal2 = Calendar.getInstance();

cal2.setTime(small);

if(cal1.get(Calendar.MONTH) != 11  cal2.get(Calendar.MONTH)==11){//跨年

Calendar cal3 = Calendar.getInstance();

cal3.set(Calendar.MONTH, 11);

cal3.set(Calendar.DAY_OF_MONTH, 31);

return cal3.get(Calendar.DAY_OF_YEAR)-cal2.get(Calendar.DAY_OF_YEAR)+cal1.get(Calendar.DAY_OF_YEAR);

}else{

return  cal1.get(Calendar.DAY_OF_YEAR)-cal2.get(Calendar.DAY_OF_YEAR);

}

}

/**

 * 获取两个日期相差的周数

 * @param big

 * @param small

 * @return

 */

public static int getTwoDatesDifOfWeek(Date big,Date small){

Calendar cal1 = Calendar.getInstance();

cal1.setTime(big);

Calendar cal2 = Calendar.getInstance();

cal2.setTime(small);

if(cal1.get(Calendar.MONTH) != 11  cal2.get(Calendar.MONTH)==11){//跨年

Calendar cal3 = Calendar.getInstance();

cal3.set(Calendar.MONTH, 11);

cal3.set(Calendar.DAY_OF_MONTH, 31);

return cal3.get(Calendar.WEEK_OF_YEAR)-cal2.get(Calendar.WEEK_OF_YEAR)+cal1.get(Calendar.WEEK_OF_YEAR);

}else{

return  cal1.get(Calendar.WEEK_OF_YEAR)-cal2.get(Calendar.WEEK_OF_YEAR);

}

}

java 列出每年的周 并设置 每年的1-7号为第一周 ，由此开始算。并找出每周对应的日期

package p6.util;

import java.text.DateFormatSymbols;

import java.util.Calendar;

import javax.swing.JOptionPane;

public class YearCalendar {

public static void main(String[] args) {

final String title = getCalTitle();

String input = JOptionPane.showInputDialog("Please input year");

try{

if(!input.trim().matches("^\\d{4}$")){

throw new NumberFormatException();

}

int year = Integer.parseInt(input.trim());

System.out.println("------- Calendar For Year " + year + " ----------------");

String[] monthTitles = new DateFormatSymbols().getMonths();

for(int month = Calendar.JANUARY; month = Calendar.DECEMBER; month++){

System.out.println("\t********** " + monthTitles[month] + " *********");

System.out.println(title);

generateMonthlyCalendar(year, month);

System.out.println("\n\n");

}

}catch(NumberFormatException nbFmtExp){

JOptionPane.showMessageDialog(null, "Error data foramt! Date should be 4 digits only format yyyy");

System.exit(0);

}

}

private static String getCalTitle() {

StringBuffer sb = new StringBuffer();

String[] ary = new DateFormatSymbols().getShortWeekdays();

for(int i = Calendar.SUNDAY; i = Calendar.SATURDAY; i++){

sb.append(ary[i]+ "\t");

}

return sb.toString();

}

private static void generateMonthlyCalendar(int year, int month) {

Calendar cal = Calendar.getInstance();

cal.set(Calendar.YEAR, year);

cal.set(Calendar.MONTH, month);

cal.set(Calendar.DATE, 1);

int maxDay = cal.getActualMaximum(Calendar.DAY_OF_MONTH);

int i = 0;

for(i = Calendar.SUNDAY; i cal.get(Calendar.DAY_OF_WEEK); i++){

System.out.print(" \t");

}

while(cal.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY){

System.out.print(cal.get(Calendar.DATE) + "\t");

cal.add(Calendar.DATE, 1);

}

int weekDay = Calendar.SATURDAY;

int day = cal.get(Calendar.DATE);

while(day = maxDay){

if(weekDay == Calendar.SATURDAY){

System.out.println();

weekDay = Calendar.SUNDAY;

}else{

weekDay++;

}

System.out.print(day++ + "\t");

}

}

}

java 如何判断 一年的最后一周是否跨年

给定一个时间范围判断周的范围并且跨年为新的一周即跨年时分为两周

public class Week{

public static void main(String[] args) {

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

Date b_date = null;

Date e_date = null;

try {

b_date = myFormatterExt.parse("2010-12-26");//开始时间

e_date = myFormatterExt.parse("2011-01-06");//结束时间

//e_date = myFormatterExt.parse("2011-01-08");

// date= myFormatterExt.parse("2010-12-31 00:00:00");

// String week = HNFDCommon.getWeek(date);

//System.out.println(week+"week");

} catch (ParseException e) {

e.printStackTrace();

}

b_date = getFirstDayOfWeek(b_date);

e_date = getLastDayOfWeek(e_date);

int dayOfweek = 0; //日期为星期几判断12月最后一个星期用

while (b_date.getTime() == e_date.getTime() || b_date.before(e_date))

{

String week = HNFDCommon.getWeek(b_date);

System.out.println(week+"ddd"+myFormatterExt.format(b_date));

String days = myFormatterExt.format(b_date).substring(8,10);

if(dayOfweek0){

b_date.setDate(b_date.getDate() +(7-dayOfweek));

dayOfweek = 0;

}else{

if(Integer.parseInt(week.substring(5,7))=50 (31- Integer.parseInt(days))7){

Date c_date = new Date();

c_date.setYear(b_date.getYear());

c_date.setMonth(b_date.getMonth());

c_date.setDate(31);

dayOfweek = getDayOfWeek(c_date);

b_date.setDate(b_date.getDate() +dayOfweek-1);

if(week.equals(HNFDCommon.getWeek(b_date))){

b_date.setDate(b_date.getDate() +(7-dayOfweek));

dayOfweek = 0;

}

}

else{

b_date.setDate(b_date.getDate() +7);

}

}

}

}

public static Date getLastDayOfWeek(Date date) {

SimpleDateFormat sd = new SimpleDateFormat("yyyy");

Calendar c = new GregorianCalendar();

c.setFirstDayOfWeek(Calendar.SUNDAY);

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()+6); // Sunday

if(!sd.format(date).equals(sd.format(c.getTime()))){

c.setTime(date);

}

return c.getTime();

}

public static Date getFirstDayOfWeek(Date date) {

SimpleDateFormat sd = new SimpleDateFormat("yyyy");

Calendar c = new GregorianCalendar();

c.setFirstDayOfWeek(Calendar.SUNDAY);

c.setTime(date);

c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek()); // Sunday

if(!sd.format(date).equals(sd.format(c.getTime()))){

c.setTime(date);

}

return c.getTime();

}

public static int getDayOfWeek(Date date) {

Calendar c = new GregorianCalendar();

c.setFirstDayOfWeek(Calendar.SUNDAY);

c.setTime(date);

//c.set(Calendar.DAY_OF_WEEK, c.getFirstDayOfWeek() + 6); // Sunday

return c.get(Calendar.DAY_OF_WEEK);

}

}

HNFDCommon 类中：

public static String getWeek(Date date)

{

String rtn="";

int year;

int week;

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

Calendar cd = Calendar.getInstance();

cd.setTime(date);

year=cd.get(Calendar.YEAR);

week = cd.get(Calendar.WEEK_OF_YEAR);

//System.out.println("ttt"+sd.format(cd.getTime())+"bbb"+week);

int vmonth = cd.get(Calendar.MONTH)+1;

if(week == 1 vmonth == 12){

cd.add(Calendar.WEEK_OF_YEAR,-1);

week =cd.get(Calendar.WEEK_OF_YEAR)+1;

}

if(week 6 vmonth == 1){

year--;

}

if(week 10){

rtn=year+"00"+week;

}

else{

rtn=year+"0"+week;

}

return rtn;

}

如何跨年计算 两日期之间相隔的周数 with java8 time API

百度搜索 你的题目， 看下开头的几个文章，应该能帮助你。

另相隔的周数 可以用获取 相差的天数 除以7

利用java计算上上周，上周，本周，下周的起止时间（可实现跨年，跨月）

Calendar c = Calendar.getInstance();

System.out.println(c.getTime());

c.set(Calendar.YEAR, 2014);

c.set(Calendar.MONTH, Calendar.DECEMBER);

c.set(Calendar.DATE, 29);

System.out.println(c.getTime());

c.set(Calendar.DATE,35);

System.out.println(c.getTime());

是这个意思吗？

java 一年的第一周从2月1号开始，获取今年的第三周的星期一，以及去年第三周的星期一 对应的日期 ？

public getWeekCount(Date date){ // 获取日历类实例 java.util.Calendar calendar = java.util.Calendar.getInstance(); // 设置时间 calendar.setTime(date); // 设置周一为每周第一天 calendar.setFirstDayOfWeek(java.util.Calendar.MONDAY); // 返回当年最大周数 return calendar.getActualMaximum(java.util.Calendar.WEEK_OF_YEAR);}

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