Calendrical Calculations R package calcal version 1.0.4 CRAN Task View: TimeSeries (https://CRAN.R-project.org/view=TimeSeries) An R implementation of the algorithms described in Reingold and Dershowitz (4th ed., Cambridge University Press, 2018) <doi:10.1017/9781107415058>, allowing conversion between many different calendar systems. Cultural and religious holidays from several calendars can be calculated. Software Depends: R (>= 4.1.0) Imports: vctrs Suggests: knitr, rmarkdown, testthat (>= 3.0.0), tibble Rob Hyndman <Rob.Hyndman@monash.edu> Comprehensive R Archive Network (CRAN) Rob Hyndman [aut, cre, cph] (ORCID: <https://orcid.org/0000-0002-2140-5352>), Edward Reingold [cph, ctb] (Original Lisp code), Nachum Dershowitz [cph, ctb] (Original Lisp code) Apache License (>= 2) 2026-02-28 application/tgz https://CRAN.R-project.org/package=calcal doi:10.32614/CRAN.package.calcal