Custom order export script modification

Hi, we are looking for a resourceful PHP developer to quickly modify an existing script that you can find attached. The script currently goes through the database, collects order info and exports it via a CSV file. Since the number of orders in the databasw has grown, the script has become very resource-intensive. The modification we are looking for is the option to set a time frame for the export, i.e. "we want to see orders from date XX/XX/XX to date YY/YY/YY", retaining the rest of the functionality. We would need: - a rudimentary interface: start date selector and end date selector - modifications to the script that displays only orders made in the selected time period Nice to have: - similar to the order creation date criteria, ability to limit export by product SKU (add input field to interface and have the script chech if the product SKU contains the input text) Thank you!