This problem was introduced with eca99b33c0. It seems Box is the only
remote which converts time zones, so if you give it a GMT time zone,
it returns a PST time zone which represents the same instant.
The purpose of this is to make it easier to maintain and eventually to
allow the rclone backends to be re-used in other projects without
having to use the rclone configuration system.
The new code layout is documented in CONTRIBUTING.