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If you decide to take on date formats it will depend on the modules you are looking through. Would be nice if it was in one place but I have seen seen them listed in many places in a single module.
Realize that the database has to have a specific format for the date format and it will return that same format. PHP has methods to change back and forth from this database. So if you do modify this format you have to realize that it still has to be in a specific format to be saved in your database.
So you could try changing the dates read in from your database first and go from there. Once you have those all changed to the right format you could then try the ones that are entered in.
Attending College working towards Bachelors in Software Engineering and Network Security.