Valuation is based on time - specifically, it's often a snapshot of corporate finance information and future predictions rolled into one calculation. As such, choosing the right time can be important, especially if a company is about to go through some major changes. Using up-to-date revenue and corporate finance data is vital for getting the value correct, which can make a massive difference to the cost of purchasing a business further down the line. Organisations like the Canadian Institute of Chartered Business Valuators put this as a high priority for smaller companies.