Delivery Date Changes Price field value with New Custom Field I got project with following requirements:


The customer should be able to select delivery date(date popup) in the checkout form.
The administrator can set special delivery date, in configuration settings. 
If the customer select a delivery date that matches with special delivery date, the prices will change.
There are 2 price field in 1 product reference. The default price field and custom special price field.
Price value will change according to the delivery date that the customer selected. 


For example: 

Case 1:


The admin set Special date to be: Feb 14, 2016 
The customer selected delivery date: March 2, 2016 
The final product price uses the default price field value.


Case 2:


The admin set Special date to be: Feb 14, 2016 
The customer selected delivery date: Feb 14, 2016 (match)
The final line item product price will use the value that was set in the custom price field.


What would be the workaround with this one. I feel stuck with my module. I was thinking if I need to use rules instead. Thanks in advance.
Rules will be the best option in the above mentioned cases. You can use "data validation" to compare both fields and set value of the "product price" field accordingly