when to post

I've heard a couple different opinions on this topic but in your opinion, is there a "best time to post" during the day or even a day of the week? If so, what has or hasn't worked for you guys?

I have been posting videos for a little over a year now and have always asked myself if there is a better time to upload than others. If anyone has had increased views by posting during certain times or what have you, or know anything about getting discovered that a newb like me might not...

Hey, does anyone know an app or something that can help me with posting time?