Wrong time in Windows: an hour out or resetting after restart?
Check the date, time zone and automatic time first. An exact one-hour offset differs from a few minutes of drift or an old date returning. Do not bypass browser security warnings or reset the BIOS to fix the clock.
Updated 11 October 2026
Safe checking order
- Record the difference before changing anything: wrong year or day, whole hours, or a few minutes? Compare with another device using automatic time. Note whether it began after travelling, restarting or the battery running flat.
- In Windows 11, open Settings → Time & language → Date & time. Check that Set time automatically is on. Labels may differ with the Windows language or version.
- Check the time zone separately. In Finland, select the zone containing Helsinki and automatic daylight-saving adjustment when available. Do not compensate for a wrong zone by moving the clock an hour. If automatic zone selection is wrong, choose the correct zone manually.
- With a working internet connection, select Sync now. Check the result and displayed time. If synchronisation fails, note the message. Do not disable the firewall or switch to a random time server.
- Save your work and restart. Compare the time just after startup and again after the internet connection is established. This helps distinguish a persistent zone setting from a problem that network synchronisation only corrects temporarily.
- If an old date returns or a clock-related firmware error appears at startup, record the message and computer model. Ask for a model-specific check. This alone does not prove a failed battery; do not open the computer or reset its BIOS based on this guide.
Symptoms and possible causes
A whole-hour offset may involve the time zone or daylight saving. A few minutes of drift may involve synchronisation. A date that resets at startup needs device-specific investigation. The JVS Tuki approach: record the symptom, change one setting and test a restart before another change.
What not to do
- Do not bypass a certificate warning. If the clock is correct, the website certificate may be the problem.
- Do not install clock-fixing utilities, edit the registry or replace a battery on a guess.
- Do not override managed settings on a work or school computer.
When to stop
Contact IT support if the settings are managed by an organisation. If correct time does not resolve a website security warning, do not sign in through it. Give support the Windows version, clock difference and when it returns; passwords are not needed.
What is wrong with the clock?
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When is help worthwhile?
JVS Tuki can help check time settings and identify whether the symptom involves Windows, the network or startup. There is no need to buy hardware before identifying the cause.
Ask for help with time settings