Sudden change date and hour

Hi,
yesterday I turned on my Mac and, after typed my password to login in, I found a warning icon telling that the date and the hour is changed to 01 January 2001, 03.05.00 (I don't remember very well the hour).
So I adjust the date and the hour in the Date and Hour Setting, then I found that the computer asked to select the home wireless network as if it is the first time I used the Pc. Obviously I selected my wireless network with his password, and everything was fine.
And today is fine.
But my question is : this sudden change of date and network is work of a malicious cookie, or malware? Or a problem of the OS X?
I am very careful with downloads from internet: I download only from well-known sites (as university, documents from my friends..), but should I delete the cookies from Safari and Firefox?
Marta
PS= before I write this post, I looked for information on my computer, but I don't understand much...

First, it would be helpful to know what model of computer you have.
Any time the date and time reset, it is likely because of an SMC reset. This can happen under several scenarios, the most common being that your computer lost power entirely. Current laptops have a coin battery in addition to the main battery that actually powers your computer. That way if the main battery dies, the coin battery still keeps the date and time settings. If the coin battery is bad (or if you have an older computer like an iBook or 12" PowerBook that doesn't have one) and your main battery dies, the date and time will reset.
If you have an iMac, and your computer was unplugged or if your home was without power for a length of time, it's also possible for this to happen, but it depends on the model as to the specifics.
It is not likely the cause of a 'malicious cookie or malware', Macs very rarely get viruses.

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