one-click-installation-script/modify_time.sh

#!/bin/bash
#by spiritlhl
#from https://github.com/spiritLHLS/one-click-installation-script
#version: 2022.12.17

# 检测本机时间是否准确的脚本

# 检测系统类型
if [ -f /etc/lsb-release ]; then
    # Ubuntu/Debian/Almalinux
    OS="Ubuntu/Debian/Almalinux"
elif [ -f /etc/redhat-release ]; then
    # CentOS/Fedora
    OS="CentOS/Fedora"
else
    # 未知系统
    OS="Unknown"
fi

# 获取当前时间和网络时间
CURRENT_TIME=$(date +%s)
NETWORK_TIME=$(wget -qSO- --max-redirect=0 google.com 2>&1 | grep Date: | cut -d' ' -f5-8)
NETWORK_TIME_SECONDS=$(date -d "$NETWORK_TIME" +%s)

# 计算时间差
DIFF=$(($NETWORK_TIME_SECONDS-$CURRENT_TIME))

# 判断时间差是否在允许范围内
if [ "$DIFF" -lt 300 ] && [ "$DIFF" -gt -300 ]; then
    # 在允许范围内，时间准确
    echo "Time on $OS system is accurate."
else
    # 不在允许范围内，时间不准确，调整时间
    echo "Time on $OS system is NOT accurate. Adjusting system time to accurate time."
    if [ "$OS" == "Ubuntu/Debian/Almalinux" ]; then
        # Ubuntu/Debian/Almalinux 系统使用 ntpdate 命令
        if [ ! -x "$(command -v ntpdate)" ]; then
            # ntpdate 命令不存在，安装 ntpdate
            sudo apt-get update
            sudo apt-get install ntpdate -y
        fi
        sudo ntpdate -u time.nist.gov || sudo ntpdate pool.ntp.org || sudo ntpdate cn.pool.ntp.org
    elif [ "$OS" == "CentOS/Fedora" ]; then
        # CentOS/Fedora 系统使用 ntpdate 命令
        if [ ! -x "$(command -v ntpdate)" ]; then
            # ntpdate 命令不存在，安装 ntpdate
            sudo yum update
            sudo yum install ntpdate -y
        fi
        sudo ntpdate time.nist.gov || sudo ntpdate pool.ntp.org || sudo ntpdate cn.pool.ntp.org
    else
        # 未知系统
        echo "Unable to adjust system time on unknown system."
    fi
fi

# 获取当前时间和网络时间
CURRENT_TIME=$(date +%s)
NETWORK_TIME=$(wget -qSO- --max-redirect=0 google.com 2>&1 | grep Date: | cut -d' ' -f5-8)
NETWORK_TIME_SECONDS=$(date -d "$NETWORK_TIME" +%s)

# 计算时间差
DIFF=$(($NETWORK_TIME_SECONDS-$CURRENT_TIME))

# 判断时间差是否在允许范围内
if [ "$DIFF" -lt 300 ] && [ "$DIFF" -gt -300 ]; then
    # 在允许范围内，时间准确
    echo "Time on $OS system is accurate."
else
    # 不在允许范围内，时间不准确
    echo "Time on $OS system is NOT accurate. Please check your system time and time zone settings."
fi