lutz: Look Up Time Zones of Point Coordinates

Input latitude and longitude values or an 'sf/sfc' POINT object and get back the time zone in which they exist. Two methods are implemented. One is very fast and uses 'Rcpp' in conjunction with data from the 'Javascript' library (<>). This method also works outside of countries' borders and in international waters, however speed comes at the cost of accuracy - near time zone borders away from populated centres there is a chance that it will return the incorrect time zone. The other method is slower but more accurate - it uses the 'sf' package to intersect points with a detailed map of time zones from here: <>. The package also contains several utility functions for helping to understand and visualize time zones, such as listing of world time zones, including information about daylight savings times and their offsets from UTC. You can also plot a time zone to visualize the UTC offset over a year and when daylight savings times are in effect.

Version: 0.3.2
Depends: R (≥ 3.2)
Imports: stats, Rcpp, lubridate
LinkingTo: Rcpp
Suggests: testthat (≥ 2.1.0), sf (≥ 0.7), sp, datasets, covr, ggplot2
Published: 2023-10-17
DOI: 10.32614/CRAN.package.lutz
Author: Andy Teucher ORCID iD [aut, cre], Bob Rudis ORCID iD [ctb]
Maintainer: Andy Teucher <andy.teucher at>
License: MIT + file LICENSE
NeedsCompilation: yes
Materials: README NEWS
CRAN checks: lutz results


Reference manual: lutz.pdf


Package source: lutz_0.3.2.tar.gz
Windows binaries: r-devel:, r-release:, r-oldrel:
macOS binaries: r-release (arm64): lutz_0.3.2.tgz, r-oldrel (arm64): lutz_0.3.2.tgz, r-release (x86_64): lutz_0.3.2.tgz, r-oldrel (x86_64): lutz_0.3.2.tgz
Old sources: lutz archive

Reverse dependencies:

Reverse imports: ARUtools, ascotraceR, card, CDSE, finbif, stationaRy
Reverse suggests: photobiology, spectator


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