Allah's Apostle said, "When night falls (or it is evening), keep your children close to you for the devils spread out at that time. But when an hour of the night elapses, you can let them free. Close the doors and mention the Name of Allah, for Shaytaan (Satan) does not open a closed door." — Bukhari 4:523, Narrated Jabir bin Abdullah
In singapore, as for my family, I will call my kids to come home when they are at playground once its 630pm in the evenings.
I only bring them out after mahgrib prayers if there is no urgent matters. I was informed that between 630pm-mahgrib prayer time, this is where the shaytan starts to recruit his "troops". Beware of evil thoughts or actions at these times, remember the following…
a) seek Allah's forgiveness [saying, Astaghfirullah ('I seek Allah's forgiveness')];
b) seek protection from the Shaytan [saying, A`udhu billahi min ash-shaytan ar-rajeem ('I seek refuge in Allah from the accursed shaytan')]
c) cut out the things that result in that bad thought immediately [e.g. shut the window with such images]
d) then thank Allah, wholeheartedly, for enabling you to overcome your desires and shaytan [saying, Alhamdulillah ('All praise is due to Allah')]; this makes Shaytan despair, and strengthens one's resolve.