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Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
"RealTimeIsUniversal"=dword:00000001

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net stop w32time
w32tm /config /syncfromflags:manual /manualpeerlist:"time.windows.com,0x8" /reliable:YES /update
net start w32time
w32tm /resync

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net stop w32time
w32tm /config /syncfromflags:manual /manualpeerlist:"time.windows.com,0x8" /reliable:YES /update
net start w32time
w32tm /resync

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w32tm /query /status

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@echo off
setlocal enabledelayedexpansion

:: ================================================
:: Windows Time Sync (W32Time) - Corrected Version
:: Target: Windows 11 24H2 (dual-boot with Linux Mint 22.2)
:: ================================================

net session >nul 2>&1
if %errorLevel% neq 0 (
    echo Error: This script requires Administrator privileges.
    echo Right-click the file and select "Run as administrator".
    echo.
    echo Press ENTER to exit.
    pause>nul
    exit /b 1
)

echo ================================================
echo  Windows Time Service Reconfiguration
echo ================================================
echo.

echo Ensuring W32Time service is running before configuration...
net start w32time >nul 2>&1

echo Configuring manual peer list (time.windows.com, Client + SpecialPollInterval)...
w32tm /config /syncfromflags:manual /manualpeerlist:"time.windows.com,0x9" /reliable:NO /update

echo Restarting W32Time service to apply configuration cleanly...
net stop w32time
net start w32time

echo Waiting for the service to fully initialize...
timeout /t 5 /nobreak >nul

echo Forcing resynchronization...
w32tm /resync /force

echo.
echo ================================================
echo  Verification
echo ================================================
w32tm /query /status

echo.
echo ================================================
echo  Reminder
echo ================================================
echo If this machine dual-boots with Linux Mint, make sure
echo UTC_BIOS_Setting.reg has been imported and the system
echo has been restarted so the BIOS clock is treated as UTC
echo consistently on both operating systems.
echo.
echo Press ENTER to exit.
pause>nul

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#!/bin/bash
export LANG=tr_TR.UTF-8
export LC_ALL=tr_TR.UTF-8

# ================================================
# NTP Synchronization + BIOS UTC Converter
# Support: systemd-timesyncd, chrony, ntpdate
# Target: Linux Mint 22.2 (dual-boot with Windows 11)
# ================================================

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'

# Resolve the real invoking user's home directory, even when running under sudo,
# so the config file is not accidentally written to /root instead of the actual user.
if [[ -n "$SUDO_USER" ]]; then
    REAL_HOME=$(getent passwd "$SUDO_USER" | cut -d: -f6)
else
    REAL_HOME="$HOME"
fi
CONFIG_FILE="$REAL_HOME/.ntp_sync_config"

# ================================================
# 1. TRUSTED ATOMIC TIME SERVER LIST
#    (Stratum 1 and high-accuracy pools)
# ================================================
declare -a SERVER_LIST=(
    "tr.pool.ntp.org"
    "time.nist.gov"
    "ntp.nict.jp"
    "ptbtime1.ptb.de"
    "0.pool.ntp.org"
    "1.pool.ntp.org"
    "time.google.com"
    "time.cloudflare.com"
    "clock.isc.org"
    "ntp.ubuntu.com"
    "0.tr.pool.ntp.org"
    "1.tr.pool.ntp.org"
)

# ================================================
# 2. HELPER FUNCTIONS
# ================================================

check_root() {
    if [[ $EUID -ne 0 ]]; then
        echo -e "${RED}Error: This script requires root privileges. Run with 'sudo'.${NC}"
        exit 1
    fi
}

# Detect the ACTIVE NTP service first, then fall back to installed binaries.
# Checking the active systemd unit avoids misdetection on systems where
# both timedatectl and chrony are installed but only one is actually running.
check_ntp_tool() {
    if systemctl is-active --quiet chronyd 2>/dev/null || systemctl is-active --quiet chrony 2>/dev/null; then
        echo "chrony"
    elif systemctl is-active --quiet systemd-timesyncd 2>/dev/null; then
        echo "timedatectl"
    elif command -v chronyc &>/dev/null; then
        echo "chrony"
    elif command -v timedatectl &>/dev/null; then
        echo "timedatectl"
    elif command -v ntpdate &>/dev/null; then
        echo "ntpdate"
    else
        echo -e "${RED}No NTP tool found (timedatectl, chrony, ntpdate).${NC}" >&2
        exit 1
    fi
}

# Save the selection to the config file (to remember it for next time)
save_config() {
    local selected="$1"
    > "$CONFIG_FILE"
    for server in "${SERVER_LIST[@]}"; do
        if [[ "$server" == "$selected" ]]; then
            echo "* $server" >> "$CONFIG_FILE"
        else
            echo "  $server" >> "$CONFIG_FILE"
        fi
    done

    # File was just written as root; hand ownership back to the invoking user
    if [[ -n "$SUDO_USER" ]]; then
        chown "$SUDO_USER":"$SUDO_USER" "$CONFIG_FILE" 2>/dev/null
    fi

    echo -e "${GREEN}Configuration file updated: $CONFIG_FILE${NC}"
}

# Ask the user to select a server
select_server() {
    echo -e "${YELLOW}=== AVAILABLE ATOMIC TIME SERVERS ===${NC}"
    local i=1
    local choice
    for server in "${SERVER_LIST[@]}"; do
        echo "  $i) $server"
        ((i++))
    done
    echo -n "Enter a server number (1-${#SERVER_LIST[@]}): "
    read -r choice

    if ! [[ "$choice" =~ ^[0-9]+$ ]] || [[ "$choice" -lt 1 ]] || [[ "$choice" -gt ${#SERVER_LIST[@]} ]]; then
        echo -e "${RED}Invalid selection! Defaulting to 'tr.pool.ntp.org'.${NC}"
        selected_server="${SERVER_LIST[0]}"
    else
        selected_server="${SERVER_LIST[$((choice-1))]}"
    fi
    echo -e "${GREEN}Selected server: $selected_server${NC}"
}

# ================================================
# 3. CONVERT BIOS (RTC) CLOCK TO UTC
# ================================================
set_rtc_to_utc() {
    local choice
    echo -e "${BLUE}--- BIOS (RTC) Clock Setting Check ---${NC}"

    if timedatectl status | grep -q "RTC in local TZ: yes"; then
        echo -e "${YELLOW}Warning: BIOS clock is currently set to LOCAL TIME (+03).${NC}"
        echo -e "${YELLOW}This causes clock confusion in Windows + Linux dual-boot setups.${NC}"
        echo -n "Do you want to convert the BIOS clock to UTC? (Y/n): "
        read -r choice

        if [[ "$choice" =~ ^[Yy]$ ]] || [[ -z "$choice" ]]; then
            sudo timedatectl set-local-rtc 0
            if [[ $? -eq 0 ]]; then
                echo -e "${GREEN}BIOS clock successfully converted to UTC.${NC}"
                echo -e "${GREEN}(Remember to also apply 'RealTimeIsUniversal=1' via UTC_BIOS_Setting.reg on the Windows side.)${NC}"
            else
                echo -e "${RED}BIOS UTC conversion failed!${NC}"
            fi
        else
            echo -e "${BLUE}BIOS UTC conversion skipped.${NC}"
        fi
    else
        echo -e "${GREEN}BIOS clock is already set to UTC. No action needed.${NC}"
    fi
}

# ================================================
# 4. systemd-timesyncd CONFIGURATION
#    (automatically edits timesyncd.conf)
# ================================================
configure_timesyncd() {
    local server="$1"
    local conf_file="/etc/systemd/timesyncd.conf"

    if [[ ! -f "$conf_file" ]]; then
        echo -e "${RED}timesyncd.conf not found!${NC}"
        return 1
    fi

    echo -e "${BLUE}Updating ${conf_file}...${NC}"

    # Backup first
    sudo cp "$conf_file" "$conf_file.bak_$(date +%Y%m%d_%H%M%S)" 2>/dev/null

    # Remove existing NTP= lines (commented or not)
    sudo sed -i "/^#\?NTP=/d" "$conf_file"

    # Insert NTP= right after the [Time] section header
    sudo sed -i "/^\[Time\]/a NTP=$server" "$conf_file"

    # Refresh FallbackNTP= as well
    sudo sed -i "/^#\?FallbackNTP=/d" "$conf_file"
    sudo sed -i "/^NTP=/a FallbackNTP=ntp.ubuntu.com time.google.com" "$conf_file"

    echo -e "${GREEN}Configuration updated: NTP=$server${NC}"
}

# ================================================
# 5. RUN SYNCHRONIZATION
# ================================================
sync_time() {
    local server="$1"
    local tool="$2"

    echo -e "${BLUE}=== Starting Synchronization (Tool: $tool) ===${NC}"

    case $tool in
        timedatectl)
            configure_timesyncd "$server"
            sudo systemctl restart systemd-timesyncd
            sleep 2
            sudo timedatectl set-ntp true
            echo -e "${GREEN}systemd-timesyncd service restarted.${NC}"
            ;;

        chrony)
            echo "server $server iburst" | sudo tee /etc/chrony.d/temp_sync.conf > /dev/null
            sudo systemctl restart chrony 2>/dev/null || sudo systemctl restart chronyd
            sleep 2
            sudo chronyc -a makestep
            echo -e "${GREEN}chrony synchronization completed.${NC}"
            ;;

        ntpdate)
            sudo ntpdate -u "$server"
            if [[ $? -eq 0 ]]; then
                echo -e "${GREEN}ntpdate synchronization successful.${NC}"
            else
                echo -e "${RED}ntpdate failed.${NC}"
                return 1
            fi
            ;;
    esac

    # Write system time to the BIOS/hardware clock (RTC)
    echo -e "${BLUE}Updating hardware clock (RTC)...${NC}"
    sudo hwclock --systohc
    if [[ $? -eq 0 ]]; then
        echo -e "${GREEN}BIOS (RTC) clock updated from system time.${NC}"
    else
        echo -e "${RED}BIOS clock update failed!${NC}"
    fi

    echo -e "${BLUE}--- Current Time Status ---${NC}"
    timedatectl status
}

# ================================================
# 6. MAIN PROGRAM
# ================================================
main() {
    local last_selected
    local reuse
    check_root

    NTP_TOOL=$(check_ntp_tool)
    if [[ -z "$NTP_TOOL" ]]; then
        echo -e "${RED}Fatal: No usable NTP tool detected. Aborting.${NC}"
        read -rp $'\nPress ENTER to exit.' _
        exit 1
    fi
    echo -e "${GREEN}NTP tool to be used: $NTP_TOOL${NC}"

    if [[ -f "$CONFIG_FILE" ]]; then
        last_selected=$(grep '^\*' "$CONFIG_FILE" | sed 's/^\* //')
        if [[ -n "$last_selected" ]]; then
            echo -e "${YELLOW}Previous selection: $last_selected${NC}"
            echo -n "Do you want to use this server again? (Y/n): "
            read -r reuse
            if [[ "$reuse" =~ ^[Yy]$ ]] || [[ -z "$reuse" ]]; then
                selected_server="$last_selected"
                echo -e "${GREEN}Using previous server: $selected_server${NC}"

                set_rtc_to_utc
                sync_time "$selected_server" "$NTP_TOOL"

                echo -e "${GREEN}=== All operations completed! ===${NC}"
                read -rp $'\nPress ENTER to exit.' _
                exit 0
            fi
        fi
    fi

    select_server
    save_config "$selected_server"

    set_rtc_to_utc
    sync_time "$selected_server" "$NTP_TOOL"

    echo -e "${GREEN}=== All operations completed! ===${NC}"
    read -rp $'\nPress ENTER to exit.' _
}

main

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Windows Registry Editor Version 5.00

; Sets the RTC (BIOS / hardware clock) to be interpreted as UTC.
; Required for consistent time handling in Windows + Linux dual-boot systems.
; After importing this file, restart Windows, then run sync_time_windows.bat.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation]
"RealTimeIsUniversal"=dword:00000001