Salamualaikum
Sometimes we are in difficult situations where we cannot offer salat. For exemple I work in a company and I don't have enough time to go home, eat, offer salat azhur and then get back to work because I have to go out 10/20 mintes before the time of salat. Not to mention salat al Asr I don't have the time to offer it at all (ps : I live in Europe and the country where I live has severe issues with racism and muslims)
So can we offer salat before it's time ?