import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * https://gitee.com/rodert/JavaPub
 */

public class CalcWorkDays {

    public static void main(String[] args) throws ParseException {
        LocalDateTime localDateTimeStart = LocalDateTime.ofInstant(new SimpleDateFormat("yyyy-MM-dd hh:mm:ss").parse("2022-01-01 01:30:10").toInstant(), ZoneId.systemDefault());
        LocalDateTime localDateTimeEnd = LocalDateTime.ofInstant(new SimpleDateFormat("yyyy-MM-dd").parse("2022-12-31").toInstant(), ZoneId.systemDefault());
        System.out.println(localDateTimeStart + " ~ " + localDateTimeEnd + " 包含工作日：" + getTimeDiffDay(localDateTimeStart, localDateTimeEnd));

    /**
     * 计算两个时间工作日天数差。
     * 1. 方法忽略法定节假日；
     * 2. 忽略周末补充上班；
     * 3. stop当天算入计算天数；
     *
     * @param localDateTimeStart
     * @param localDateTimeStop
     * @return
     * @throws ParseException
     */
    public static int getTimeDiffDay(LocalDateTime localDateTimeStart, LocalDateTime localDateTimeStop) throws ParseException {
        if (localDateTimeStart.isAfter(localDateTimeStop)) {
            return -1;
        }
        System.out.println(localDateTimeStart);
        Date begin = Date.from(localDateTimeStart.atZone(ZoneId.systemDefault()).toInstant());
        Date endTime = Date.from(localDateTimeStop.atZone(ZoneId.systemDefault()).toInstant());
        Calendar cEnd = new GregorianCalendar();
        cEnd.setTime(endTime);
        // 计算时算入stop当天
        cEnd.add(Calendar.DATE, 1);
        Date end = cEnd.getTime();
        Calendar c = Calendar.getInstance();
        c.setTime(begin);
        int count = 0;
        while (c.getTime().before(end)) {
            // 非周末
            if (c.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY && c.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY) {
                count++;
            }
            c.add(Calendar.DATE, 1);
        }
        return count;
    }
}