需求：

需要在后端实现计算当前日期与数据库内保存的日期数据之间相隔的工作日数目

实现

java 复制代码

import java.time.DayOfWeek;
import java.time.LocalDateTime;

public class WorkdaysCalculator {
    public static void main(String[] args) {
        String givenDateTimeStr = "2022-01-01T12:34:56.789"; // 替换为你的日期时间字符串

        LocalDateTime currentDateTime = LocalDateTime.now(); // 获取当前时间
        LocalDateTime givenDateTime = LocalDateTime.parse(givenDateTimeStr);

        int workdaysCount = 0;  // 记录相隔工作日数目
        int daysCount = 0;  // 记录相隔天数总数目
		// 循环 直到当前日期在给定日期之前
        while (currentDateTime.isAfter(givenDateTime) || currentDateTime.equals(givenDateTime)) {
            if (isWorkday(currentDateTime.getDayOfWeek())) {
                workdaysCount++;
            }
            currentDateTime = currentDateTime.minusDays(1);  // 当前日期减去一天
            daysCount++;
        }

        if (workdaysCount > 90) {
            System.out.println("给定日期超过90个工作日");
        } else {
            System.out.println("给定日期不超过90个工作日");
        }

        System.out.println("总天数：" + daysCount);
        System.out.println("工作日天数：" + workdaysCount);
    }

    private static boolean isWorkday(DayOfWeek dayOfWeek) { //校验当前日期是否为工作日
        return dayOfWeek != DayOfWeek.SATURDAY && dayOfWeek != DayOfWeek.SUNDAY;
    }
}