[Frumious Bandersnatch]

When you change the facts around as you do, the underlying assumption, of course, changes. Given the facts that I gave you, then it an absolute certainty I was correct. The underlying assumptions, in this case, were that you understood that twelve months equals one year and that January comes before June in the hierarchy of months. Furthermore, the concept of "birthday" is generally well understood to mean the anniversary of the date of one's birth. While the way we count birthdays has changed (we used to speak of a 13 year-old as being in his 14th year), the sequential nature of them has not.

I gave an example to show the use of deduction. Without changing the facts around or the generally acceptable underlying assumptions which I made, can you show that I did not use deductive reasoning?

[Socratic]

...the generally acceptable underlying assumptions which I made, can you show that I did not use deductive reasoning?

You used deductive reasoning quite well, but I was pointing out your "generally acceptable underlying assumptions" may be mistaken for FACTS when they are merely generally acceptable underlying assumptions.

Would you be calling a Socratic, a Sophist? Tread lightly young man.