The customer review date changer extension for Magento is a small, lightweight plugin that allows you to change the date for customer reviews at your Magento store. While importing your store from one CMS like WordPress to Magento, you have to go through the peril of fixing the dates for customer reviews. By default, the Magento store would assign the dates on which you moved the reviews and not the actual ones on which each was written. That means all the reviews would have the same date. To change that, you needed to go to the database and change each date, which was a very time consuming and inefficient method.
To solve this issue you can use Customer Review Date Changer extension to assign the correct date to each review. The extension is compatible with Magento 1.4.x, 1.5.x, 1.6.x, 1.7.x, 1.8.x and 1.9.x
A drop-down calendar would help you pick the right date easily.