At the 3DS menu. Odd that you aren't getting. You might want to try making the range of min/max of your Pokemons IVs wider, and not exactly 1 number like you are doing. Make sense? I will post a pic in a second.Start Pokemon White from the 3DS menu, or Continue from the game's menu? My seconds value has been as soon as I started the game from the 3DS menu, but I just tried it from Continue and that didn't work, either.
For that screenshot, I synced the 3DS with the external clock at 15:01:00, turned off the system, turned it back on, then started Pokemon White from the 3DS menu at 15:02:00.
EDIT: Look at min/max IV range. That's what should look like if your pokemon isn't level 100 or you checked with pokecheck.