This is a WooCommerce plugin for handling temporary prices.
First of all clone the project or download the zip file in the repository.
Then install the file wc-price-changer.zip into the plugin section of your WordPress site and activate it.
In the WP-Admin section of your WordPress site navigate to WooCommerce > WC Price Changer.
The plugin dashboard contains a table with all the products in WooCommerce's database: the table let admins to do bulk actions with one or more products selected.
The main actions are the unit price change and the percentage price change. The first one is for increasing or decreasing products prices by an unit value. The last one increases or decreases products prices by a percentage value.
The price decrease will set the sale price for every selected product from its own regular price. The price increase will set the price field for selected products from regular price.
It's possible to periodize price changing by selecting datetime from the action setup. Without selecting datetime the price changing will directly affect your WooCommerce database.