Member Avatar for gurupts

Time and Date reset in win 7, every day it happen some time when i restart the system...i replace a new cmos battery but it won't help..

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A compact diagnostic checklist for (building on the suggestions from and ). The symptom—clock resetting daily despite a new CMOS battery—usually comes from one of two categories: the motherboard/RTC not keeping time, or some software/process changing the clock after boot. The fastest way to narrow the root cause is a small set of reproducible tests and a couple of quick logs to capture.

Test whether the BIOS/RTC itself holds time: enter BIOS, set the correct time, save, then fully power the machine off and remove AC power (and the main laptop battery if applicable) for several minutes. On power-up, check the BIOS time. If the BIOS lost the setting the problem is hardware-level (battery contact, battery wiring, CMOS/RTC chip or a faulty board). Reseat or replace the cell, try clearing CMOS with the motherboard jumper, and consider a BIOS update; persistent loss after those steps usually points to a motherboard/RTC fault. (lifewire.com)

If BIOS time is correct but Windows changes it at boot, inspect Windows time and the source of changes. From an elevated prompt run the following to see the configured source and force a resync:

w32tm /query /status
w32tm /query /source
w32tm /resync /rediscover
net stop w32time
net start w32time

Also check the Security event log for Event ID 4616 (“The system time was changed”) to see which account/process made the change. If the PC is domain-joined, verify the domain time hierarchy (PDC emulator) and, if a manual resync fails, investigate DNS, UDP/123 filtering, or misconfigured peers. These steps help identify whether Windows/NT P/third-party software is overwriting the clock. (learn.microsoft.com)

Consider dual-boot or virtualization as another common cause: Linux and Windows often treat the motherboard clock differently (UTC vs local), and VM host/guest tools can force syncs. Resolve by matching the RTC policy (Linux timedatectl or Windows RealTimeIsUniversal registry option) or disabling unwanted guest/host time sync. Useful diagnostics to collect for further analysis: BIOS behavior after cold power-off, the output of w32tm /query /status and /source, and any Event 4616 entries. (howtogeek.com)

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Member Avatar for silvercats

what is your AV software? are you sure your computer doesn't have any viruses ?

Member Avatar for silvercats

did you select the correc ttime zone? how much is the time change normally?
start from the safe mood and tell me if still happens

Member Avatar for JorgeM

Windows by default, is configured to sync its time with time.windows.com. If the Windows computer joins a domain its going to sync with the DC that holds the PDC Emulator role.

Does the time reset to a time back in history? or is it just updating by a few minutes/hour?

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