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TZInfo provides daylight savings aware transformations between times in
different timezones.
Data Sources
------------
TZInfo requires a source of timezone data. There are two built-in options:
1. The TZInfo::Data library (the tzinfo-data gem). TZInfo::Data contains a
set of Ruby modules that are generated from the [IANA Time Zone
Database](http://www.iana.org/time-zones).
2. A zoneinfo directory. Most Unix-like systems include a zoneinfo directory
containing timezone definitions. These are also generated from the [IANA
Time Zone Database](http://www.iana.org/time-zones).
By default, TZInfo::Data will be used. If TZInfo::Data is not available
(i.e. if `require 'tzinfo/data'` fails), then TZInfo will search for a
zoneinfo directory instead (using the search path specified by
`TZInfo::ZoneinfoDataSource::DEFAULT_SEARCH_PATH`).
If no data source can be found, a `TZInfo::DataSourceNotFound` exception
will be raised when TZInfo is used. Further information is available [in the
wiki](http://tzinfo.github.io/datasourcenotfound) to help with resolving
`TZInfo::DataSourceNotFound` errors.
The default data source selection can be overridden using
`TZInfo::DataSource.set`.
Custom data sources can also be used. See `TZInfo::DataSource.set` for
further details.
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