Invalid input datetime format of value In Magento 2

Installing:

https://github.com/fernandofauth/magento2_datetime

Simply paste the FernandoFauth folder on (magento root)/app/code

After installing the module upgrade your store.

bin/magento setup:upgrade

Check if your cache is clean.

If using production mode, you need recomplie the store code.

Follow this steps
bin/magento setup:upgrade

bin/magento indexer:reindex

bin/magento deploy:mode:set production -s

bin/magento setup:di:compile

bin/magento setup:static-content:deploy (lang_code) [ ex: bin/magento setup:static-content:deploy pt_BR]

Other thing you can do is check your folder permissions.