NEWS.md
In joeroe/era: Year-Based Time Scales

era (development version)

era 0.5.0

New yr_sort() function for chronological ordering of year vectors (#44)
New yr_earliest(), yr_latest(), and yr_range() functions for chronological extremes of year vectors (#43)

era 0.4.1

This patch fixes a malfunctioning test that was causing CRAN checks to fail. There are no significant changes.

Fixed malfunctioning check

era 0.4.0

New eras:
Anno Mundi (Hebrew calendar)
New year units:
Sidereal, tropical, and anomalistic astronomic years #15
Hebrew lunisolar years
Changes to existing eras:
More precise epoch value for Hijri eras: 621.5394 instead of 622.
More precise epoch value for Nowruz (Solar Hijri) eras: 621.2218 instead of 622.
Fixed recurring issues related to the absence of a year 0 in BCE/CE #4
this_year() now considers the current date, returns a floored integer (i.e. the actual current calendar year), and is vectorised over era.
Added pillar printing methods for era (#33) and era_year (#34) in tibbles
Class constructors era() and yr() now return a zero-length vector when called with no arguments (instead of an error), allowing them to be used as prototypes
era_yr objects can now be cast to character vectors (e.g. as.character(yr(1, "BP")))
Combining otherwise equivalent eras with different names or labels with c() now triggers a warning (#27), consistent with combining them using arithmetic (#3)
The era package no longer exports magrittr's pipe operator (%>%)

era 0.3.1

CRAN release.

Fixed moved link in README

era 0.3.0

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

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
era() constructor
Format and print methods for eras
Getter functions for era parameters: era_label(), era_name(), era_epoch(), era_unit(), era_scale(), era_direction()
eras() defining standard eras
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.