important date

A simple answer is no – there are many dates that are relevant in the F6 exam but before you try learning any of these make sure you are competent with the technical aspects of preparing each of the tax computations along with the specific areas of adjustment of profits, capital allowances and the employment income benefits.
When you have done all that then you can look at dates such as the dates you see in the chapters on self assessment for both personal and corporate tax – chapters 15 & 23