fujita/swift3 — pull request #68 by cwedgwood (2014-05-02 20:32:30+00:00)
Title: Don't put as Z suffix at the end of dates.

ISO-8601 / http://www.w3.org/TR/NOTE-datetime mentions:

This profile defines two ways of handling time zone offsets:

1. Times are expressed in UTC (Coordinated Universal Time), with a
special UTC designator ("Z").

2. Times are expressed in local time, together with a time zone
offset in hours and minutes. A time zone offset of "+hh:mm"
indicates that the date/time uses a local time zone which is "hh"
hours and "mm" minutes ahead of UTC. A time zone offset of
"-hh:mm" indicates that the date/time uses a local time zone
which is "hh" hours and "mm" minutes behind UTC.

A standard referencing this profile should permit one or both of
these ways of handling time zone offsets. "

The 'Z' character will be part of the data string already if needed,
adding a second one causes various tools to behave badly.