About "Specials by weekdays and hours"
This module will help you to manage specials much effectively by using additional parameters in specials: weekdays and hours.
This module is also compatible with the module "Bulk Specials Editor + The Countdown Timer (OC 2.x)".
You can do with specials whatever you want.
For example, you can create a big sale "Black Friday" that will show only special price for certain products on Friday for the whole day or in particular hours. Or another example: you can use "Happy hours" for some products in your online store.