lesson-28 — Adjust time to locale with negative offset

1)
Update
String offset = data['utc_offset'].substring(1,3);
with
String offset = data['utc_offset'].substring(0,3);

To keep a sign.

2) Use "utc_datetime" instead of "datetime".
// it is strange why
// DateTime.parse(datetime) does not adjust time with offset in the "datetime" string)

3) Another improvement when offset is with an half of hour.

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