We had one week kickoff training. I found out about a lot of stuff there. Most of them I wasn't even aware of before. But, the end of the training meant we need to prepare a real pitch in front of the innovation council. That wasn't easy. Although my idea was chosen before, it could happen that presented material in the pitch doesn't meet the criteria. Luckily, that wasn't the case and this was the official start of the project.
For me it wasn't the date where I focused 100% on it, since I was still part of the other project in company, so I couldn't start building it. But, with every day I wanted to start doing "business" more and more.