Exact Date and Duration Arithmetic on an Annual Grid R package datey version 0.1.1 Standardised mapping of dates onto a discrete annual grid, together with exact date and duration arithmetic. This matters when the primary unit is years but the input data uses dates. Examples are actuarial mortality experience analysis and valuation of life assurance and annuities, for which mortality rates are defined per year but experience and valuation data are typically defined using dates. Software Depends: R (>= 4.0.0) LinkingTo: cpp11 Suggests: knitr, pillar, rmarkdown, testthat (>= 3.0.0) Tim Gordon <tim.gordon@btinternet.com> Comprehensive R Archive Network (CRAN) Tim Gordon [aut, cre] (ORCID: <https://orcid.org/0009-0006-3087-4384>) MIT + file LICENSE (https://CRAN.R-project.org/package=datey/LICENSE) 2026-07-14 application/tgz https://CRAN.R-project.org/package=datey doi:10.32614/CRAN.package.datey en-GB