timezone-detect: Haskell bindings for the zone-detect C library; plus tz-aware utils.

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Please see the README on GitHub at https://github.com/lfborjas/timezone-detect#readme

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Change log ChangeLog.md
Dependencies base (>=4.9 && <4.14), time (>=1.9.1 && <=1.10), timezone-olson (>=0.2.0 && <0.3), timezone-series (>=0.1.0 && <0.2) [details]
License GPL-2.0-only
Author Luis Borjas Reyes
Maintainer timezone-detect@lfborjas.com
Category Data, Foreign, Time
Home page https://github.com/lfborjas/timezone-detect#readme
Bug tracker https://github.com/lfborjas/timezone-detect/issues
Source repo head: git clone https://github.com/lfborjas/timezone-detect
Uploaded by lfborjas at 2020-08-30T18:45:27Z



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Haskell bindings to the excellent ZoneDetect library, plus additional UNIX-aware facilities to determine the UTC time of a given local time in a latitude and longitude.


You'll need timezone database files to work with this library, see instructions in the original repository.

Once you have those files in hand, you'll be able to get a timezone from a given latitude and longitude:

>>> lookupTimeZoneName "./test/tz_db/timezone21.bin" 40.7831 (-73.9712) :: Maybe TimeZoneName
Just "America/New_York"

Additionally, we now depend on the timezone-series and timezone-olson packages to add awareness of tz database information.

With that, you can look up the UTC time at a point in time and space:

>>> import Data.Time
>>> localWinter <- parseTimeM True defaultTimeLocale "%Y-%-m-%-d %T" "2019-12-25 00:30:00"
>>> utcTime <- timeAtPointToUTC "./test/tz_db/timezone21.bin" 40.7831 (-73.9712) localWinter
2019-12-25 05:30:00 UTC

>>> localSummer <- parseTimeM True defaultTimeLocale "%Y-%-m-%-d %T" "2019-07-25 00:30:00"
>>> utcTime <- timeAtPointToUTC "./test/tz_db/timezone21.bin" 40.7831 (-73.9712) localWinter
2019-12-25 04:30:00 UTC