There are so many factors that can go into spell casting; color, planets, the tides, etc. The time of day hold specific meaning and power to our magick as well. What follows is my correspondences for the times of day in magick.
Time of day in Magick:
Dawn: awakening, beginnings, inspiration.
Noon: power, strength, willpower, pinnacle.
Twilight: diminishing, endings, changes, banishing.
Midnight: endings, releasing, witching hour, connection to the spirit realm.