ActiveRecord date field

By accident, I just realized that an ActiveRecord date field can be set
using a third way...

foo =
foo.start_date =, 1, 31)
foo.start_date = '2016-01-31'

and to my surprise...

foo.start_date = '31/1/2016'

Where can I find documentation on this? I've searched to the point of
wasting my time.

In the most general case, active record ends up calling Date._parse ( ) from the ruby stdlib which tries to guess/handle all sorts of different formats ( ) but without documenting what they are (as far as I can see)


there are lots, try this eg
just remember, this is ruby, and "foo=" can be a method call.

kind regards --botp