dateFormat in slider edit based on admin user locale

[LusienGG]

I`ve been facing an issue with this extension for a long time ( 2 years ) where users with different locale are editing the start/end date of the banners.

Examples to test:

Make your admin user with the country option Bulgaria for example. Create a slider with start date 12 Feb 2021 using js datepicker. As expected from the hardcoded format and the locale:

• the date used is 12/02/2021 which is 2 Dec 2021 and the banner does not fire up.

I am just contributing my fix to the issue for the community.