Year-Based Time Scales R package era version 0.6.0 CRAN Task View: Paleontology (https://CRAN.R-project.org/view=Paleontology) CRAN Task View: TimeSeries (https://CRAN.R-project.org/view=TimeSeries) 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. Software Depends: R (>= 2.10) Imports: vctrs (>= 0.3.0), methods, rlang, pillar, zeallot Suggests: tibble, testthat, covr, knitr, rmarkdown, dplyr, spelling, purrr, tidyr, lubridate Joe Roe <joeroe@archaeo.dev> Comprehensive R Archive Network (CRAN) Joe Roe [aut, cre] (ORCID: <https://orcid.org/0000-0002-1011-1244>) MIT + file LICENSE (https://CRAN.R-project.org/package=era/LICENSE) 2026-07-30 application/tgz https://CRAN.R-project.org/package=era doi:10.32614/CRAN.package.era en-GB