Isn't the concept of time there because we 'measure' it? So you can't exactly say that it did not exist before just because no one was there to record it.(of course you can't prove the opposite either) but that's just another though?
Everything is a theory (big bang, colours, etc) so take it as a grain of salt. Discussing it and getting other people's opinions and views will help to improve your argument in the future.
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