TZInfo is a Ruby library that provides daylight savings aware transformations between times in different timezones. TZInfo requires a source of timezone data. There are two built-in options: - The separate TZInfo::Data library (the tzinfo-data gem). TZInfo::Data contains a set of Ruby modules that are generated from the IANA Time Zone Database. - A zoneinfo directory. Most Unix-like systems include a zoneinfo directory containing timezone definitions. These are also generated from the IANA Time Zone Database. By default, TZInfo::Data will be used. If TZInfo::Data is not available, then TZInfo will search for a zoneinfo directory instead. WWW: https://tzinfo.github.io/