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The local timezone offset is added twice on date fields:
- when going from input field to db storage
- when going from db storage to web display

This results in datetime entries autoincrementing by 2x the
local timezone offset on each edit of an issue.

Local timezone offset should be _substracted_ from the input
value when storing into the db, not added.

When I enter a new deadline through the input field::
2004-09-25

my database says::
>>> db.project.get(8,'deadline')
<Date 2004-09-25.02:00:0.000000>

which displays in the web interface as::
2004-09-25.04:00:00