era (development version) Unreleased

  • this_year() now considers the current date, returns a floored integer (i.e. the actual current calendar year), and is vectorised over era.

era 0.3.1 2021-01-29

CRAN release.

  • Fixed moved link in README

era 0.3.0 Unreleased

Second beta / CRAN pre-release.

  • Added new era definitions:
    • Islamic calendars (Lunar Hijri, Solar Hijri).
    • Julian calendar
  • Reworked era definition scheme:
    • Unit is now represented by the era_year class, which describes its length in solar days as well as its name. Added functions for constructing and working with era_year objects: era_year(), is_era_year(), era_year_label(), era_year_days().
    • Direction is now coded as 1 (“forwards”) or -1 (“backwards”). The previous character arguments still work but are deprecated.
    • Equality tests for eras now only check significant parameters (i.e. not “label” or “name”), allowing for coercion between functionally equivalent eras, e.g. yr(1, "BP") + yr(1, "cal BP") now works (with a warning) (#3).
  • Improved yr_transform():
    • Can now convert between eras with different year units (#25).
    • Now has a precision argument, allowing the result to be rounded (#23).
  • era and yr objects are now validated when constructed, using new functions validate_era()/is_valid_era() and validate_yr()/is_valid_yr() (#7 and #8).
  • Minor changes/bug fixes:
    • Added this_year(), which returns the current year as a yr object.
    • era(NA) now returns an error, not a vector of all standard eras (#20).
    • All era arguments in functions can now accept a character vector (#20)
    • era(<era>) now returns an era with the same parameters (to enable the above)
    • Various additions to make the coercion hierarchy for era_yrs more consistent; most notably, the common prototype of era_yr, integer, and double, is now era_yr.
    • Fixed printing of NA eras (#9)
    • Errors now use the rlang format and are in general more informative (#26 and #28)

era 0.2.0 Unreleased

First beta release, including:

  • S3 vector class yr (era_yr) representing years with an era
    • yr() constructor
    • Functions for getting and setting the era of a yr object: yr_era(), yr_era()<- and yr_set_era()
    • Format and print methods for yrs
    • Vector arithmetic methods for yrs
  • S3 record class era representing an era definition
  • yr_transform() function for converting years between eras
  • Function documentation and introductory vignette: vignette("era")
  • A NEWS.md file to track changes to the package.

era 0.1.0 Unreleased

Initial development version.