手稿|手稿 - 帮一同事写的计算时间差（忽略某一天中的某些事件端）工具方法手稿-帮一同事写的计算时间差

原需求：计算两个给定的两个时间差，但是要求忽略 21:00~次日09:00。
【手稿|手稿 - 帮一同事写的计算时间差（忽略某一天中的某些事件端）工具方法】思路：

一天24小时，切换为一天12个小时。
给定的两个时间预处理到，切换到一天中的 09:00 ~ 21:00（有效计算）中
然后计算两个时间查：预处理之后的倆时间的差（24h） - 间隔天数*每天有效的时间（12h）
Test code

package com.test; import com.sun.tools.javac.util.Assert; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; /** * TestMain * * @author: Mr.Rookie */ public class TestMain {public static long startIndex = 9 * 60 * 60; // 9:00 unit: s public static long during = 12 * 60 * 60; // start + during = 21:00 unit: spublic final static int DAY_SECOND = 24 * 3600; public TestMain() { }public static void main(String args[]) throws Exception {testDuring(); }public static void testDuring() throws Exception { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date start= sdf.parse("2019-01-01 22:00:00"); Date end= sdf.parse("2019-01-01 23:00:00"); System.out.println(formatPrint(during(start, end))); end= sdf.parse("2019-01-02 12:00:00"); System.out.println(formatPrint(during(start, end))); end= sdf.parse("2019-01-03 21:00:00"); System.out.println(formatPrint(during(start, end))); }/** * * @param startDate * @param endDate * @return */ public static long during(Date startDate, Date endDate) {Assert.check(endDate.compareTo(startDate) >= 0, "The endDate must be greater than startDate !!!"); long inputStart = startDate.getTime() / 1000; long inputEnd= endDate.getTime() / 1000; if ( inputEnd == inputStart ) { return 0; }long startDateTime= getDateOffset(startDate); long endDateTime= getDateOffset(endDate); // date during int dayDuring= (int)(endDateTime -startDateTime) / DAY_SECOND; // Preprocess parameters of input long temp = 0; if ( inputStart < (temp = startDateTime + startIndex) ) { inputStart = temp; } else if ( inputStart > (temp += during) ) { inputStart = temp; }if ( inputEnd < (temp = endDateTime + startIndex) ) { inputEnd = temp; } else if ( inputEnd > (temp += during) ) { inputEnd = temp; }// return result return (inputEnd - inputStart) - dayDuring * (DAY_SECOND - during); }/** * 清除指定日期的时间戳信息，并返回当前时间的偏移量，单位秒 * @param date * @return */ private static long getDateOffset(Date date) { Calendar instance = Calendar.getInstance(); instance.setTime(date); // cleartimestamp instance.set(Calendar.HOUR_OF_DAY, 0); instance.set(Calendar.MINUTE, 0); instance.set(Calendar.SECOND, 0); instance.set(Calendar.MILLISECOND, 0); return instance.getTime().getTime() / 1000; }/** * * @param second * @return */ private static String formatPrint(long second) { int day = (int)(second / DAY_SECOND); // day int hour = (int)(second %= DAY_SECOND) / 3600; // h int min = (int)(second %= 3600) / 60; return String.format("%02d天%02d小时%02d分%02d秒", day, hour, min, second); }}