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在Linux系统中你有遇到时间不对,怎么改都不准确,哪就来了解一下系统时钟与硬件时钟吧

  • 2026-02-11 12:36:01
在Linux系统中你有遇到时间不对,怎么改都不准确,哪就来了解一下系统时钟与硬件时钟吧

1. 基本概念

系统时钟(System Clock)

· 定义:由Linux内核维护的软件时钟

· 特点:

  · 系统启动时从硬件时钟读取时间

  · 系统运行时独立运行

  · 通常使用UTC(协调世界时)格式存储

  · 可以通过NTP(网络时间协议)同步

· 查看命令:

  date

  timedatectl

硬件时钟(Hardware Clock / RTC)

· 定义:主板上的物理时钟芯片(实时时钟RTC)

· 特点:

  · 由CMOS电池供电,关机后仍能运行

  · 独立于操作系统

  · 通常以本地时间或UTC格式存储

· 查看命令:

  sudo hwclock --show

  sudo hwclock -r

2. 两者关系

开机时:硬件时钟 → 系统时钟

关机时:系统时钟 → 硬件时钟(可选)

运行时:系统时钟独立运行

3. 常用操作命令

查看时间

# 查看系统时间

date

date +"%Y-%m-%d %H:%M:%S"

# 查看硬件时间

sudo hwclock --show

sudo hwclock -r

# 查看详细时间信息

timedatectl

同步时间

# 将系统时间同步到硬件时钟

sudo hwclock --systohc    # System to Hardware Clock

sudo hwclock -w           # 简写

# 将硬件时钟同步到系统时间

sudo hwclock --hctosys    # Hardware Clock to System

sudo hwclock -s           # 简写

# 使用NTP同步

sudo timedatectl set-ntp true

sudo ntpdate pool.ntp.org

设置时间

# 设置系统时间

sudo date -s "2024-01-01 12:00:00"

# 设置硬件时间

sudo hwclock --set --date="2024-01-01 12:00:00"

sudo hwclock --set --date="01/01/24 12:00:00"

# 使用timedatectl设置

sudo timedatectl set-time "2024-01-01 12:00:00"

4. 时区管理

查看和设置时区

# 列出所有时区

timedatectl list-timezones

ls /usr/share/zoneinfo/

# 查看当前时区

timedatectl | grep "Time zone"

date +"%Z %z"

# 设置时区

sudo timedatectl set-timezone Asia/Shanghai

sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

硬件时钟的存储格式

# 查看硬件时钟使用UTC还是本地时间

timedatectl | grep "RTC in local TZ"

# 设置为UTC(推荐)

sudo timedatectl set-local-rtc 0

# 设置为本地时间(Windows双系统时可能需要)

sudo timedatectl set-local-rtc 1

5. NTP时间同步

systemd-timesyncd服务

# 启用/禁用NTP同步

sudo timedatectl set-ntp true

sudo timedatectl set-ntp false

# 查看状态

timedatectl status

systemctl status systemd-timesyncd

chrony(替代NTP)

# 安装chrony

sudo apt install chrony    # Debian/Ubuntu

sudo yum install chrony    # RHEL/CentOS

# 配置

sudo vim /etc/chrony/chrony.conf

sudo systemctl restart chronyd

chronyc sources -v

6. 时间格式说明

格式    说明            示例

UTC  协调世界时 2024-01-01 12:00:00 UTC

Local 本地时间 2024-01-01 20:00:00 CST

ISO 8601 国际标准 2024-01-01T12:00:00Z

Unix时间戳 秒数 1704115200

7. 常见问题与解决方案

双系统时间不一致

# Windows使用本地时间,Linux使用UTC时会出现时间差

# 解决方案1:让Linux使用本地时间

sudo timedatectl set-local-rtc 1 --adjust-system-clock

# 解决方案2:让Windows使用UTC(推荐)

# 在Windows注册表中修改:

# HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation

# 添加DWORD值:RealTimeIsUniversal = 1

硬件时钟偏差

# 检查时钟偏差

sudo hwclock --verbose

# 调整时钟漂移

sudo hwclock --adjust

CMOS电池耗尽

症状:

· 每次开机时间重置

· 硬件时钟显示错误时间

解决方案:

· 更换主板CMOS电池

8. 检查脚本示例

#!/bin/bash

# 时间检查脚本

echo "=== 系统时间 ==="

date

echo ""

echo "=== 硬件时间 ==="

sudo hwclock --show

echo ""

echo "=== 时区信息 ==="

timedatectl

echo ""

echo "=== NTP同步状态 ==="

timedatectl | grep -A2 "NTP"

echo ""

echo "=== 时间同步源 ==="

if command -v chronyc &> /dev/null; then

    chronyc sources -v

elif command -v ntpq &> /dev/null; then

    ntpq -p

fi

9. 最佳实践

1. 服务器环境:

   · 使用UTC时间

   · 启用NTP自动同步

   · 定期检查时间偏差

2. 桌面环境:

   · 根据所在地区设置正确时区

   · 启用NTP同步

   · 双系统用户注意时间格式统一

3. 嵌入式系统:

   · 考虑使用NTP或GPS授时

   · 配置合适的RTC芯片

   · 实现时间持久化存储

10. 重要配置文件

· /etc/adjtime - 硬件时钟调整记录

· /etc/timezone - 系统时区设置(Debian系)

· /etc/localtime - 时区链接文件

· /etc/chrony/chrony.conf - chrony配置

· /etc/ntp.conf - NTP配置

理解系统时钟和硬件时钟的区别及相互关系,对于系统管理、日志分析和故障排查都至关重要。

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  1. CONNECT:[ UseTime:0.000524s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000688s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000292s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000259s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000454s ]
  6. SELECT * FROM `set` [ RunTime:0.000188s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000473s ]
  8. SELECT * FROM `article` WHERE `id` = 474978 LIMIT 1 [ RunTime:0.000318s ]
  9. UPDATE `article` SET `lasttime` = 1770796062 WHERE `id` = 474978 [ RunTime:0.009142s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000254s ]
  11. SELECT * FROM `article` WHERE `id` < 474978 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000375s ]
  12. SELECT * FROM `article` WHERE `id` > 474978 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000441s ]
  13. SELECT * FROM `article` WHERE `id` < 474978 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001019s ]
  14. SELECT * FROM `article` WHERE `id` < 474978 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003433s ]
  15. SELECT * FROM `article` WHERE `id` < 474978 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002926s ]
0.094726s