package com.ruoyi.performance.utils;
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import java.time.LocalTime;
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import java.time.format.DateTimeFormatter;
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import java.util.regex.Pattern;
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/**
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* 时分时间差计算工具类
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* 支持格式：HH:mm（24小时制），如 08:30、23:59、00:00
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*/
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public class HourDiffCalculator {
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// 校验HH:mm格式的正则（24小时制，小时00-23，分钟00-59）
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private static final Pattern TIME_PATTERN = Pattern.compile("^([01]?[0-9]|2[0-3]):[0-5][0-9]$");
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private static final DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("HH:mm");
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/**
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* 计算两个 HH:mm 时间的小时差
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*
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* @param startTime 开始时间，例如 "23:30"
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* @param endTime 结束时间，例如 "01:30"
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* @return 小时差，结束时间小于开始时间时返回负数
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*/
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public static double getHourDiff(String startTime, String endTime) {
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validateTimeFormat(startTime);
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validateTimeFormat(endTime);
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LocalTime start = LocalTime.parse(startTime, FORMATTER);
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LocalTime end = LocalTime.parse(endTime, FORMATTER);
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int startMinutes = start.getHour() * 60 + start.getMinute();
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int endMinutes = end.getHour() * 60 + end.getMinute();
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int diffMinutes;
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if (endMinutes >= startMinutes) {
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diffMinutes = endMinutes - startMinutes;
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} else {
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diffMinutes = -(24 * 60 - startMinutes + endMinutes);
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}
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return diffMinutes / 60.0;
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}
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public static void main(String[] args) {
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System.out.println(getHourDiff("08:00","11:15"));
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}
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/**
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* 校验时间格式是否为HH:mm
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*/
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private static void validateTimeFormat(String time) {
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if (time == null || !TIME_PATTERN.matcher(time).matches()) {
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throw new IllegalArgumentException("时间格式错误，需为HH:mm（24小时制）：" + time);
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}
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}
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}
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