It used to be 5 days.

Check for member existance before accesing internal values of the
member.

The change to use UTC broke the test

The order deadline is stored in UTC but we were comparing it to the
local timezone to decide if we need to close it.

* Closes: #27

Cents should be negative as well.

* Closes: #17

* Closes: #22

* Closes: #19