Added user timezone setting (defaults to Brisbane).

[cofiem]

WARNING: finding original audio recordings may not work with user time zone other than Brisbane - test this!

Relates to #22 #23
Closes #24 #116

[coveralls]

Coverage decreased (-0.03%) when pulling 790ba84 on feature-time-zone-improvements into 29f17dc on develop.

[cofiem]

Maybe use zonebie gem to check timezones in tests?

[coveralls]

Coverage decreased (-1.0%) when pulling 15528d2 on feature-time-zone-improvements into 29f17dc on develop.

[atruskie]

Just off the top of my head I think the maintinance task (QutBioacoustics/baw-private#13 && #22 && #23) needs to preclude this change - for sanity's sake - pretty much like you already said.

Also what affects is this going to have on the API? I assume the time zone will be encoded (e.g. +08) with every date sent back?

[cofiem]

Comments, useful links:

• It might be better to use TZInfo rather than ACtiveSupport:TimeZone
• (Rails uses a reduced set of time zones, and different names)
• See
• TZInfo gem
• Stackoverflow timezone tag description
  • "may find it difficult to use them in other contexts. For example, if you need to pass a time zone to a JavaScript library, or via a REST API to some third party, it may be difficult to consume them in Rails format."
• How to Convert TZInfo identifier to Rails TimeZone name/key
• http://stackoverflow.com/questions/21494223/storing-timezone-and-currency-for-a-user
• ActiveSupport::TimeZone Rails
• Time zone name for audio recordings probably should be stored on the site.
• Time zone name for site probably should be a string (to cope with offsets/time zone names)

[cofiem]

We need to record the utc offset and the time zone name. This will enable us to display the time in the time zone the audio recording was made. We do not want to display the time in the user's timezone - that makes no sense.

We will need to retroactively add utc offsets and time zone names to all recordings. @jwim1 will help with this.

[cofiem]

Need to record utc offset at time of recording (as this could change due to changes in time zone e.g. DST start/end).
Need time to be able to know the time zone recording was made (for display and provenance).