My cable TV provider allow me to select the channels "à la carte" using their website. Apparently, even their computer system seems to have business hours:

Self-service is currently unavailable.

Hours of operations are:

   * Monday to Saturday, from 7 :00 AM to 11 :00 PM.
   * Sunday from 10 :00 AM to 11 :00 PM.
We apologize for the inconvenience.

This time I'm annoyed. It is so 20th century.