Accessible function or class from all tpl pages

@alirezaaa wrote:

Hello,
I need to make a date conversion function in order to convert the Gregorian date system currently used in OJS. I have made the functions, but I don`t know where to put them so I can call them from all template (tpl) or Php files.
I tested merging them in the Issue, Journal or Core classes, which was not applicable, because it depends on whether the user is logged in or not and many other factors.
Is there a general class for this purpose?
how can I access a new function from all website pages?
I am using OJS 2.4.7

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