计算俩个日期之间相差多少天-CFANZ编程社区

一、计算俩个日期之间相差多少天

 // 假设有两个Date对象
 Date date1 = new Date(); // 当前时间
 Date date2 = new Date(); // 可以设置为其他时间
              
 //将Date 转为 LocalDate
//推荐使用以下这种方法转
LocalDate localDateA = date1.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
LocalDate localDateB = date2.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
        
  // 计算天数差
 long daysBetween = ChronoUnit.DAYS.between(localDate1, localDate2);
        
 System.out.println("Days between: " + daysBetween);

二、计算俩个日期之间相差多少天（去除周末）

Date dateA = new Date();
Date dateB = new Date();

//将Date 转为 LocalDate
//推荐使用以下方法进行转换
LocalDate localDateA = dateA.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();
LocalDate localDateB = dateB.toInstant().atZone(ZoneId.systemDefault()).toLocalDate();

long workdays = countWorkdaysBetween(localDateA, localDateB);
System.out.println("工作日数量: " + workdays);


private static long countWorkdaysBetween(LocalDate startDate, LocalDate endDate) {
    long workdays = 0;
    LocalDate tempDate = startDate;
    while (!tempDate.isAfter(endDate)) {
        DayOfWeek dayOfWeek = tempDate.getDayOfWeek();
        if (dayOfWeek != DayOfWeek.SATURDAY && dayOfWeek != DayOfWeek.SUNDAY) {
            workdays++;
        }
        tempDate = tempDate.plusDays(1);
    }
    return workdays;
}

三、计算俩个日期之间相差多少天（去除周末和法定节假日）

// 假设这是你的两个日期
Date dateA = new Date();
Date dateB = new Date();

// 转换为 LocalDate
LocalDate localDateA = dateA.toInstant().atZone(ZoneId.systemDefault()).toLocalDat
LocalDate localDateB = dateB.toInstant().atZone(ZoneId.systemDefault()).toLocalDat

// 假设这些是你的法定假日
List<LocalDate> holidays = new ArrayList<>(Arrays.asList(
        LocalDate.of(2024, 1, 1), // New Year's Day
        LocalDate.of(2024, 12, 25) // Christmas
        // 添加更多假日...
));

// 计算工作日
int businessDays = countBusinessDays(localDateA, localDateB, holidays);
System.out.println("Business days between the two dates: " + businessDays);

//计算相差人数具体方法
private static int countBusinessDays(LocalDate start, LocalDate end, List<LocalDate> holidays) {
    int businessDays = 0;
    for (LocalDate date = start; !date.isAfter(end); date = date.plusDays(1)) {
        if (!isWeekend(date) && !isHoliday(date, holidays)) {
            businessDays++;
        }
    }
    return businessDays;
}

//判断是否是周末
private static boolean isWeekend(LocalDate date) {
    return date.getDayOfWeek() == DayOfWeek.SATURDAY || date.getDayOfWeek() == DayOfWeek.SUNDAY;
}

//判断是否是节假日
private static boolean isHoliday(LocalDate date, List<LocalDate> holidays) {
    return holidays.contains(date);
}

四、JDK7计算俩个日期之间相差多少天

// 假设这是你的两个日期
Date dateA = new Date(); // 替换为具体的日期
Date dateB = new Date(); // 替换为具体的日期

// 计算天数差
long daysBetween = calculateDaysBetween(dateA, dateB);
System.out.println("Days between the two dates: " + daysBetween);


private static long calculateDaysBetween(Date dateA, Date dateB) {
    Calendar calendarA = Calendar.getInstance();
    calendarA.setTime(dateA);
    Calendar calendarB = Calendar.getInstance();
    calendarB.setTime(dateB);
    // 确保 dateA 不晚于 dateB
    if (calendarA.after(calendarB)) {
        // 交换日期
        Calendar temp = calendarA;
        calendarA = calendarB;
        calendarB = temp;
    }

    // 设置时间为一天的开始
    calendarA.set(Calendar.HOUR_OF_DAY, 0);
    calendarA.set(Calendar.MINUTE, 0);
    calendarA.set(Calendar.SECOND, 0);
    calendarA.set(Calendar.MILLISECOND, 0);
    calendarB.set(Calendar.HOUR_OF_DAY, 0);
    calendarB.set(Calendar.MINUTE, 0);
    calendarB.set(Calendar.SECOND, 0);
    calendarB.set(Calendar.MILLISECOND, 0);

    // 计算时间差
    long diffInMillis = calendarB.getTimeInMillis() - calendarA.getTimeInMillis();

    // 转换为天数
    long diffInDays = diffInMillis / (1000 * 60 * 60 * 24);
    return diffInDays;
}