首先確認(rèn)時(shí)區(qū)和日期設(shè)置正確，確保“自動(dòng)設(shè)置時(shí)間”和“自動(dòng)設(shè)置時(shí)區(qū)”已開啟，若已開啟則關(guān)閉後重新開啟以強(qiáng)制刷新；2. 在“日期和時(shí)間”設(shè)置中點(diǎn)擊“立即同步”，若失敗則更換互聯(lián)網(wǎng)時(shí)間服務(wù)器為time.nist.gov或pool.ntp.org；3. 通過services.msc重啟Windows Time服務(wù)，若未運(yùn)行則啟動(dòng)並設(shè)置啟動(dòng)類型為自動(dòng)，或在管理員命令提示符下執(zhí)行net stop w32time和net start w32time，必要時(shí)運(yùn)行w32tm /register重置服務(wù)；4. 檢查防火牆或網(wǎng)絡(luò)是否阻止NTP通信（UDP端口123），嘗試更換網(wǎng)絡(luò)環(huán)境或聯(lián)繫IT部門；5. 在管理員命令提示符下運(yùn)行w32tm /resync強(qiáng)制同步時(shí)間，若失敗則使用w32tm /query /status查看同步狀態(tài)和源；6. 若重啟後時(shí)間仍不準(zhǔn)，可能是主板CMOS電池（如CR2032）耗盡，需更換電池並在BIOS中校準(zhǔn)時(shí)間。大多數(shù)問題可通過重啟時(shí)間服務(wù)或更換時(shí)間服務(wù)器解決，若仍無法同步則可能為網(wǎng)絡(luò)或硬件問題。

If your Windows PC clock is behind and won't sync automatically, it's a common issue—but easy to fix in most cases. The problem usually comes from a misconfigured time service, internet sync failure, or incorrect time zone settings. Here's how to fix it step by step.

? 1. Check Time Zone and Date Settings

First, make sure your time zone is correct—this is often overlooked.

• Press Win I to open Settings .
• Go to Time & Language > Date & time .
• Make sure:
  • Set time zone automatically is On (or manually set it correctly if needed).
  • Set time automatically is On .

If it's already on but still wrong, turn it off , wait 10 seconds, then turn it back on to force a refresh.

? 2. Manually Sync with Internet Time Server

Windows uses time.windows.com by default, but sometimes it fails to sync.

• In Settings > Time & Language , scroll down and click "Sync now" under "Additional settings".
• If it fails, click "Sync button again, or:
  • Click "Additional date, time & regional settings" (classic Control Panel).
  • Choose "Date and Time" > "Internet Time" tab.
  • Click "Change settings" .
  • Ensure "Synchronize with an Internet time server" is checked.
  • Try changing the server to one of these more reliable ones:
    • time.nist.gov
    • pool.ntp.org
  • Click Update now , then OK .

?? If you get an error like “Unable to contact server”, it might be a firewall or network issue (see below).

? 3. Restart the Windows Time Service

The Windows Time (W32Time) service might be stuck or disabled.

• Press Win R , type services.msc , and press Enter.
• Scroll down to Windows Time .
• Right-click > Restart .
• If it's not running, right-click > Start .
• Double-click it and set Startup type to Automatic .

You can also do this via Command Prompt (as Admin):

 net stop w32time
net start w32time

For a deeper reset (optional):

 w32tm /register

Then restart the service again.

? 4. Check Firewall & Network Issues

Sometimes firewalls or network policies block NTP (port 123 UDP).

• Make sure your firewall isn't blocking outbound UDP traffic on port 123 .
• Try switching to a different network (eg, phone hotspot) to rule out local network restrictions.
• Corporate networks sometimes override time servers—check with IT if on a work device.

? 5. Use Command Line to Force Sync

Open Command Prompt as Administrator and run:

 w32tm /resync

You should see:

"The command was completed successfully."

If it says “The computer did not resync because no time data was available,” then:

• The time service isn't working.
• Or you have no internet access.
• Or NTP is blocked.

You can also query the current status:

 w32tm /query /status

Look for the Last Successful Sync Time and Source .

? 6. Hardware Clock (CMOS Battery) – Last Resort

If the clock is consistently wrong after reboot , even when synced, the CMOS battery on your motherboard might be dead.

• This tiny battery (usually CR2032) keeps the BIOS clock running when the PC is off.
• If it's dead, the clock resets or drifts every time you power off.
• Replace the battery (easy on desktops, a bit harder on some laptops).

After replacing, enter BIOS and set the correct time.

Summary Checklist

• [ ] Time zone correct?
• [ ] "Set time automatically" turned on?
• [ ] Tried syncing with time.nist.gov ?
• [ ] Restarted Windows Time service?
• [ ] Ran w32tm /resync in Admin CMD?
• [ ] CMOS battery possibly dead?

Most cases are fixed by restarting the Windows Time service or switching to a better time server. If it still won't sync, the issue is likely network-related or hardware-based.

Basically, start simple and work up—usually it's just a glitch in the sync process.

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