era: Year-Based Time Scales

Provides a consistent representation of year-based time scales as a numeric vector with an associated 'era'. There are built-in era definitions for many year numbering systems used in contemporary and historic calendars (e.g. Common Era, Islamic 'Hijri' years); year-based time scales used in archaeology, astronomy, geology, and other palaeosciences (e.g. Before Present, SI-prefixed 'annus'); and support for arbitrary user-defined eras. Years can converted from any one era to another using a generalised transformation function. Methods are also provided for robust casting and coercion between years and other numeric types, type-stable arithmetic with years, and pretty-printing in tables.

Version:	0.5.0
Depends:	R (≥ 2.10)
Imports:	vctrs (≥ 0.3.0), methods, rlang, pillar
Suggests:	tibble, testthat, covr, knitr, rmarkdown, dplyr, spelling, purrr, tidyr, lubridate
Published:	2024-11-20
DOI:	10.32614/CRAN.package.era
Author:	Joe Roe [aut, cre]
Maintainer:	Joe Roe <joe at joeroe.io>
BugReports:	https://github.com/joeroe/era/issues
License:	MIT + file LICENSE
URL:	https://era.joeroe.io, https://github.com/joeroe/era
NeedsCompilation:	no
Language:	en-GB
Materials:	README NEWS
In views:	TimeSeries
CRAN checks:	era results

Documentation:

Reference manual:	era.pdf
Vignettes:	Years with an era (source, R code)

Downloads:

Package source:	era_0.5.0.tar.gz
Windows binaries:	r-devel: era_0.5.0.zip, r-release: era_0.5.0.zip, r-oldrel: era_0.5.0.zip
macOS binaries:	r-release (arm64): era_0.5.0.tgz, r-oldrel (arm64): era_0.5.0.tgz, r-release (x86_64): era_0.5.0.tgz, r-oldrel (x86_64): era_0.5.0.tgz
Old sources:	era archive

Linking:

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