To the best of my knowledge (Accounting for a minimal percentage of inaccuracy. ) , it was ...
... Sunday 10 August 598.791 a.c, at 1325 hours by the Uhhhrk brothers ,
Ahhhk (the oldest) and Nhhhk ( the younghest)
in the front yard of their cave complex by the large tree not far from the creek in the valley (to the left).
Later on one of their descentent Waoowaoo went to invent the wheel, but couldn't patent it as the patent office it came much much later in history.
They are survived by today humanity, of wich the vast majority
can not care less of when Ahhhk and Nhhhk discover how to use the fire.
One point not noted: fire enabled cooking. Raw meat is difficult to chew, and possibly contaminated with bacteria. Cooked meat is much easier to chew and digest, and safer to eat. Meat is a very rich source of protein, which likely contributed to the growth in brain power.