package cn.org.hentai.jtt1078.util;
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import java.nio.ByteBuffer;
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import java.time.Instant;
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import java.time.ZoneOffset;
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import java.time.ZonedDateTime;
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import java.time.format.DateTimeFormatter;
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public class TimeUtils {
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/**
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* 将8字节时间戳字节数组（大端序）转成格式化时间字符串（UTC时区）
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* @param bytes 8字节数组，表示自Unix纪元以来的毫秒数
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* @return 格式化时间字符串，例如："2025-07-30 12:34:56"
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*/
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public static String bytes8ToTimeString(byte[] bytes) {
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if (bytes == null || bytes.length != 8) {
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throw new IllegalArgumentException("字节数组必须为8字节长度");
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}
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// 默认大端字节序读取long
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long timestampMillis = ByteBuffer.wrap(bytes).getLong();
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Instant instant = Instant.ofEpochMilli(timestampMillis);
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ZonedDateTime utcTime = instant.atZone(ZoneOffset.UTC);
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DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").withZone(ZoneOffset.UTC);
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return formatter.format(utcTime);
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}
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public static long bytes8ToLong(byte[] bytes) {
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if (bytes == null || bytes.length != 8) throw new IllegalArgumentException("Invalid byte array");
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return ((long)(bytes[0] & 0xFF) << 56) |
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((long)(bytes[1] & 0xFF) << 48) |
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((long)(bytes[2] & 0xFF) << 40) |
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((long)(bytes[3] & 0xFF) << 32) |
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((long)(bytes[4] & 0xFF) << 24) |
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((long)(bytes[5] & 0xFF) << 16) |
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((long)(bytes[6] & 0xFF) << 8) |
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((long)(bytes[7] & 0xFF));
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}
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public static void main(String[] args) {
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// 示例8字节时间戳
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byte[] tsBytes = new byte[]{0, 0, 1, 122, 68, 95, -54, 0}; // 例子
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System.out.println(bytes8ToTimeString(tsBytes));
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}
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}
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