How do you evolve an eevee into umbreon in pokemon light platinum? i know its during the night, but how can you tell its night?

"such has been the patient suffrence of these colonies; and such is now the necessity which constrains them to after their former systems of government. the history of the present king of great britain is a history of reapeated injuries and usurpations, all having in direct object the establishedment of an absolute tyranny over these states." which statement best describes the excerpt