My MacBook pro says clock is set to date before January 1 2008

How I I get my MacBook pro to rese to the correct time? It has done this before and when restarted it is back to normal. It seems to happen when the battery goes dead. This time it won't correct the problem itself.

It seems to happen when the battery goes dead
When you lose power to the clock chip, it cannot remember the time.
System preferences > Date&Time > ...
... will allow you to set the Data & Time again. Check your Time Zone and that a sensible format (e.g., US, Canada, or UK if that is where you live) is selected, and NOT Custom.

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