As everyone should know, there are cheats in no time. If you are very new and don't know, i'll explain.
So, is you press tab you bring up the PLC. Go to files, click 'new' and rename the file from 'New File'
to 'New File.eee'. 'eee' lets you execute the file. Now, type this in the space below the title:
cococrab
cocohelp
it will come up with the cheats. There, now lets progress.

To set the year simply type ' cocoyear ' with the year you want after this. The thing is, you can manipulate this to send you to any BC time of your choice. I do not think AD works though, or any date before -4000.
Here is an what i typed in:
cocoyear -3000
I saw a something you see in 4000 BC but a little different, and a kind of mini-volcano. That's all destroy the timeline, experiment yourself!