Task creation date
Show when a task entry was created. I type this in myself now. ELSE a unique ID per task would be a great reference, is there one in the systems already? just display it.

The new Get It Done will show you the date the task was created, Just click on the task then click History. Goto this link to learn how to get on the new app:
http://blog.getitdoneapp.com/2017/02/all-new-get-it-done-task-app/
Thanks,
Mike
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Philip Palzer commented
For the GTD-category "waiting for" it is essential to know, when a task was created. Thus this would be a comfort-function.
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Clancy commented
Creation date is critical for any reasonable list of items...I look back on some old entries and realize I have no idea when I made the entry. I've been adding the entry date now to the end of the task; not the best approach, but until the entry date is included...