The return value is a number in YYYYMMDD format and is the date on which the entry occurred (not the EntrySetup signal day).
For a Weekly or Monthly strategy, this will be the actual entry date (e.g. a Monday if Weekly), not the date of the weekly entry bar, which is always its end date (typically a Friday).
If used as Combined(EntryDate) when multiple positions are open in the same symbol (whether due to pyramiding or multiple strategies), the most recent entry date for that symbol will be returned.
