What happened before time itself?Is a time period of an event necessary to say that this happened?In physics the passing of time is relativistic depending on your frame of reference.But we cant escape from time.Maybe from this point of view it is absolute for all of us.
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Welcome to Philosophy SE. Your question makes some common assumptions which are not necessarily true.
Let me explain the problem with thermodynamics.
If we assume that gases are made of things (for example, molecules), we are able to describe their behavior using the laws of thermodynamics. That is science. Science is knowledge obtained using the scientific method; it is based on empirical facts (facts of our experience). Each one of us has the same experience with objects or things. So, we normally assume that objects are indisputable, non-debatable facts. Scientific knowledge help us surviving.
But there are issues with scientific knowledge. Paradoxes, errors, inconsistencies, etc. That is normal, scientific knowledge is not perfect. The main reason, for philosophers, is - precisely - that it is based only on our experience.
Because gases are NOT necessarily made of things! Things are just manifestations of our experience, more related with our mind that with the physical nature.
So, if you consider that a gas is not necessarily made of objects, thermodynamics is not anymore valid. For example, Boltzmann's formula is useless (because it is highly dependent on accountable objects, which might not be a real fact). After centuries of focusing on the object, science has started focusing on the subject: us, the observer. That is part of the great success of quantum mechanics.
The same happens with Einstein's relativity. It is based on our experience. For Immanuel Kant, time and space do not exist, they are just a framework that our mind creates in order for us to understand the context of our existence.
So, when you say "before time itself", you should consider first if time is not necessarily a fact of the nature outside of our perception, time might be just a fact of our experience, which raises from our five senses and our reason.
If you want to enter into the subject, I recommend you to get an introduction on the early empiricists, Locke, Berkeley, Hume and of course, Kant.