When exactly did the UK declare war on the Libyan Government and people of Libya ..?

We said at that time all seemed very commendable Gaddafi prevent the use of military aircraft against civilians, but if we engage grow and move as if the general public know why on earth does not appear at the beginning of our politicians and recorded any chance of a rider in the Strasbourg Parliament, no country wants to take now, we have kept silent until after fleeing otherwise, from now further!