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That is incorrect. Eevees do not evolve at a certain level. As a matter of fact, they don't evolve at all, on their own.
To evolve an Eevee into an Umbreon, you must level it up at night, while it has a high happiness rating.
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Eevee doesn't have a set level to evolve into Umbreon. All you have to do to evolve it is max out its happiness at night. ~KKMG1
To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
You will need to have your Eevee to full Happiness, then level it up at least once during the night to evolve it into Umbreon.
you have to level him up at night