Date & Time are kept by RTC (Real Time Clock) CMOS Battery, which is usually a coin-cell battery on the motherboad.
As the RTC of your system is dead, it can not keep time.
Therefore, RTC (CMOS Battery) is required to be replaced with a new one to fix the issue.
Refer here for more information/ disassembly guide.
Let me know if any further clarification is required. Hope this helps! Dont forget to rate the solution!!
CreativeTECH
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