When is the best time to run fb ads?

If you have an existing account then check analytics for when your audience are most active

As a rule - it depends on your timezone. Most people promote during daytime unless you have a different niche.
Generally, Sundays are the worst since the majority is almost cut down in half and most people get on socials above 4PM.

Michael5656 said:

So what is the difference between weekend and the middle or beginning of the week? Are the ads more successful when people finish a week work and all they want is go out drinking or not?

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This really highly depends on what you are advertising and what your products or services are related to. Usually, the middle of the weekend has better conversions, beginning of the week is maybe good for some motivational stuff but people won't be interested that much in buying something or hiring some services at the beginning of the week, they will leave it for you the other part, after Wednesday. Weekends should be avoided unless you're posting something funny and creative. As for some exact hours, I would say maybe after work is better when they prepare for a drink they aren't so willing to read some promotional or serious posts.

I think this all depends on the product you sell. I'm selling weight loss products, and they definitely work best on weekends