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In Pokémon FireRed and LeafGreen, however, the time function is completely absent, allowing it to be more like the Generation I games. This also makes it impossible for Eevee to evolve into either Espeon or Umbreon in these games.

Source: Bulbapedia/ Time

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But there's no daylight rotation. Does it still work?
Check the edited answer.
darn... looks like i have to get coliseum again.
However, if you trade it to Ruby, Sapphire, or Emerald, there is time presence there so trade and do the happiness evolution there.