If you are having an issue with updating the schedule dates of WooCommerce product using WPUF fields, you can follow the given instructions to solve this issue.
1) Add two date type field to WPUF form that you created to allow users for uploading products.
2) Insert _sale_price_dates_from & _sale_price_dates_to meta keys accordingly for these two fields.
3) Change the date format of WPUF date field.
4) Now, add the following code inside the theme’s functions.php file.
GeSHi Error: GeSHi could not find the language php (using path /home/mahbktbn/public_html/wp-content/plugins/codecolorer/lib/geshi/) (code 2)
All done, add a product from the frontend with the sales price and insert dates for sales from, sales to fields. The fields data will update properly to WooCommerce sale price dates.