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The BIOS battery keeps the Date & Time and the BIOS settings from changing. If the BIOS battery is flat then these settings are changed to the factory settings. Yuo need to insert a new BIOS battery then go into the BIOS setting to set the Date & Time etc.
IS your TimeZone is Correct? Right click on your clock, choose Adjust Date/Time. Click Time Zone Tab. Make sure your Time zone is correctly set.
Boot into the BIOS (setup) screens and check the date and time there. If the date is off by years then that verifies you need a new CMOS battery. Do not confuse the CMOS battery with the large external battery you run the computer with.
When you change the date and Time to the correct Date and Time and when you next boot up the laptop the Date and Time is lost. Then this is caused by a flat BIOS battery which cannot keep these setting stored in the BIOS. Replace the BIOS battery then go into the BIOS setting to set the Date and Time and this will fix your problem.
When you boot up and the Date & Time is wrong then you correct the
Date & Time, then when you shut down and boot up again the Date and
Time has changed. This is an indication that the BIOS battery is flat
and you need to replace the BIOS battery. Install a new BIOS battery, go
into the BIOS setting and set the Date & Time etc. and the new
battery will keep your settings stored in the BIOS.
did you ever save the changes?? for any changes you do in bios you have to save them at the finish by engaging the F10 and Y for yes as in confirm .. there is no other thing hat may stop you from making changes..either the battery is gone ..and in this case it will not hold even the date or clock ..and you will need to set them each time you start ..(also file association and other changes you make in computer on the settings level ...0 so if the battery is ok ..probably the saving changes is to blame ...select it proper cause on some is the F10 key and Y to confirm ..and some just ask you on exit and you have to select the proper line for to save the changes..
To determine if the battery is providing power to the CMOS, insert other changes to the bios besides time. Like enable certain features and then power on, then turn off. If the next time the date falters, go into the BIOS, and see if the changes you made are still there.
If they are, it is not your battery. If they are not, remove your battery, clean the terminals, (check the new battery is good) and reseat it.
michrophone may be related to the BIOS resetting. (solve one problem at a time)
If you change the BIOS date and time and when you boot up next time and the date and time has changed back or is incorrect, then the most likely fault is a flat BIOS battery. Replace the BIOS battery, it maybe a coin type lithium 3volt battery. this is the most common type used in motherboards is a CR2030 lithium battery.
Go into the BIOS by turning on the laptop and pressing F2. In there i believe on the main screen you can change the time and date. Do that, save changes and exit and then go into windows and see if it keeps the right time and date.