Where better to keep common functions?

Question

I have functions for working with date in class.

export class DateName {
  weekDaysList() {...}
}

Do I need to create a module with a service for a date? Import the class where needed?

Answer 1

According to my experience, a service should contain methods that communicate between the controllers and the persistent layers.

Date functions, in this case, should live in the helper or utility folder.