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If you evolve an Eevee while it is your buddy pokemon and you have walked at least 10km with it, it will turn to Umbreon during the night and to Espeon during the day. But what are the exact timeframes here, i.e. what times are considered day and night by Pokemon Go? I haven't been able to find an exact answer to this.

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This likely uses the same mechanism the game uses to determine whether to show "day" or "night" maps. I believe it gets the local sunset/sunrise time from the phone. In this case the evolution will be Espeon from sunrise to sunset, and Umbreon from sunset to sunrise.

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    So when the game uses the nighttime/blue ambience it's considered night? – MoritzLost Apr 14 '17 at 19:38
  • I haven't confirmed this, but it's the simplest hypothesis. – pjmorse Apr 16 '17 at 14:39
  • Well. I have read news once that it has been confirmed. I think it was on SilphRoad or similar – VortexYT Apr 21 '17 at 16:39
  • To add onto this, night and day will be different depending where you live, time of year, etc. Very easy to distinguish in the game though. – RoneRackal Apr 24 '17 at 4:17
  • It definitely doesn't use local sunset time, though maybe it picks some number related to it. It's always gotten "dark" between 7 and 8 for me, but in reality, it's dark at 4 in the winter and 10 in the summer. – Kat Jul 19 '17 at 0:33

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