Do you think for meditation there is a good day or bad day? Meditation is such a thing that it does not need any particular day to start with or practice it, but if you are asking which time of the day then definitely this question has significance.
Meditation is the road to make an inward journey, a soulful journey and this journey gets perfect by continuous practice and you can make your meditation better if you choose the perfect time of the day. The perfect time is the early morning. May be 3:30 Am to 6:30, it is the best time I believe. It is the time when you have the calmness of the entire world, less noise, a perfect atmosphere to practice meditation and you can actualize meditation in a true sense
You can also do meditation at other time of the day, but in early morning you can maximize the result of meditation.