One of the most common uses and requests that we get related to Salesforce Workflow is "Can we set up a Workflow Rule that automatically sends out Alerts based on the time of Day"?
The answer is yes, but currently, it requires you to use the AppExchange App "Unlimited Workflows, (AKA Workflow for Professional Edition).
No matter if you have Salesforce Professional Edition or Salesforce Enterprise Edition, this can be acheived with AppExchange App "Unlimited Workflows". Using Unlimited Workflows (also known as Workflow for Professional Ediiton", here is what we did for a client who recently had the following requirement:
We would like to create workflow rule to send our active clients an email alert on the 15th and 25th of every month during business hours. How should the workflow rule look so that it works correctly?