This weekend after i saw high percentage of conversions on saturday evening(had 100% ROI), and much lower on sunday evening(not even break even) i again began thinking about dayparting, and "weekparting".
We can all guess weekends has higher conversions %. But i couldnt think sunday is a lot different from saturday. But it seems it is different a lot.
I tried to search for any statistics about the time and dates of the week dating sites see most visits/conversions. Didn't find anything
Anyone found any real statistics on that?
Problem is, the static is YOU 
Some stuff converts better on weekends and other better during work days. Will have to find out for your offer yourself. The assumption with the weekend (evening/nights) converting better as are the working days is true for dating. Problem is when you only run it on 1 day at a special time you get low volume
It really depends I think on the ages and sex....
for instance I had a offer targeting women that did real well in the AM EST....like between 6am and 12pm then it dropped like a rock till 8pm....then picked up again....till 2am est....
I think you just need to gather the data for what your running and find what works.....
You'll have to test it an track it yourself to see. General stats on when things sell/convert well won't be of any benefit to you. You need to see how your offer converts for a few weeks, track/graph it and you'll have the best answers possible