You can allow or restrict weekend shipping for any customer as needed.
This option can be found in the company settings page under the Order Settings section in the Administrator's backend.
Scenarios of this functionality follows:
Restricting 'Allow Weekend Shipping'� by opting No, the end user will not be able to select a Desired Ship Day of Saturday or Sunday from the portal during the checkout process.
This option is also enforced when the user does not have permission to select a Desired Ship Date. The system automatically calculates company and part lead times and forces the Desired Ship date to fall on the following Monday if otherwise it would fall on a weekend day.