1.檢查CMOS電池是否需要更換，2.確保Windows自動(dòng)同步時(shí)間設(shè)置已開(kāi)啟，3.進(jìn)入BIOS/UEFI手動(dòng)校正系統(tǒng)時(shí)間，4.高級(jí)用戶(hù)可配置NTP服務(wù)器。 Windows電腦重啟後時(shí)間錯(cuò)誤通常由CMOS電池耗盡、時(shí)間同步設(shè)置異常、BIOS時(shí)間錯(cuò)誤或NTP配置問(wèn)題導(dǎo)致，首先應(yīng)嘗試更換主板上的CR2032電池，並使用工具檢測(cè)電壓；若電池正常，則需在系統(tǒng)設(shè)置中啟用自動(dòng)時(shí)間與時(shí)區(qū)同步並手動(dòng)測(cè)試同步功能；同時(shí)檢查BIOS中的時(shí)間設(shè)置並修正錯(cuò)誤；對(duì)於企業(yè)環(huán)境或高級(jí)用戶(hù)，可通過(guò)命令提示符配置Windows時(shí)間服務(wù)以指定時(shí)間服務(wù)器進(jìn)行同步。

Sometimes your Windows PC might reset the date and time to something completely off after a reboot. It's annoying, especially if you rely on accurate timestamps for work or logs. The good news is that it's usually not a serious issue — more like a small misconfiguration or hardware hiccup.

Check the CMOS Battery First

This is the most common cause. Your motherboard has a small battery (like a coin cell) that keeps the system clock running even when the PC is off. If it's dying or dead, the clock resets every time you shut down.

• Try replacing the CMOS battery (usually a CR2032).
• You can check the current battery voltage using tools like HWMonitor (if supported by your hardware).
• A fresh battery should last a few years, so this fix is often long-term.

Sync Time Automatically via Windows Settings

If the battery isn't the problem, Windows might just be failing to sync time properly after boot. Luckily, there are built-in settings to handle that.

Go to:

• Settings > Time & Language > Date & Time
• Make sure “Set time automatically” and “Set time zone automatically” are both turned on.
• Click on "Sync now" under “Synchronize your clock” to test if it works immediately.

Also, make sure your internet connection is stable during boot — Windows needs to reach out to Microsoft's time servers.

Check for BIOS/UEFI Time Settings

Sometimes the issue isn't with Windows at all — the BIOS might be storing the wrong time and passing it along at startup.

• Restart your PC and enter BIOS/UEFI (usually by pressing Delete, F2, or F12 during boot)
• Navigate to the system time/date settings
• Manually correct the time if it's off
• Save and exit

Also, look for any option related to “RTC Alarm Power On” or similar — sometimes these can interfere with the clock if set incorrectly.

Bonus: Advanced NTP Configuration (Optional)

For advanced users or in corporate environments, you might want to tweak the Windows Time service:

• Open Command Prompt as Administrator
• Run w32tm /query /configuration to see current time server settings
• You can change the server using:

   w32tm /config /manualpeerlist:"time.windows.com" /syncfromflags:manual /update

This forces Windows to use a specific time server consistently.

That's about it. Most of the time, it's either the CMOS battery or a sync setting gone rogue. Fix those, and your clock should stay put.

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