CSV file is been used for data import, export, and generating a report.
If you have huge data available in the MySQL database and you only require a specific date range data but the file contains all records and you need it on your own.
By adding a date filter to the form you just need to pick the range and export it.
In this tutorial, I show how you can export MySQL database data in CSV format by date range with PHP. I am using jQuery UI for datepicker.