Ability to change time zone

[eamanu]

Hello,

Could be possible add some method to be variable and seteable the
TIMEZONE variable [0]? For the use on different timezone on an
application, we need convert the time to a local (or UTC) timezone
and that is a little noisy. So, IMHO the logic must be
in the module/library, to be more clear on the 3rd party applications.

If there aren't objetion I can prepare a patch.

[0] https://github.com/gisce/iec870ree/blob/master/iec870ree/app_asdu.py#L10

[tinogis]

No objection if you prepare the patch