NA_INTEGER) when
parsing durationy from text in C++. Results are unaffected
on conforming hardware.Initial CRAN release.
datey and durationy represent dates and
durations on a discrete annual grid, with exact, associative arithmetic
(+, -, comparisons, mean(),
range(), etc.).start_day(), mid_day(),
end_day() and datey() map calendar
year/month/day (and day-fraction), fractional years and
Date, POSIXct, POSIXlt to
datey.to_ymdf() and $year, $month,
$day and $day_fraction provide the breakdown
of a datey into year, month, day and day fraction
components.is_start_day() and is_mid_day() provides
checking of datey alignment.as.double() and as.integer() provide
convenient conversion to numeric types as years, with mixed number and
datey/durationy arithmetic adhering to the
same convention using implicit conversion.NA_datey_, NA_durationy_ and
NA_datey_interval_ provide type-correct NAs,
with full is.na()/anyNA() support.datey,
durationy and datey_interval.pillar_shaft() methods for readable printing of
datey/durationy/ datey_interval
columns in tibbles.is_leap_year() for integer years and
dateys.datey_interval (constructed with
datey_interval() or %to%) represents a
half-open [start, end) date interval. Operations include:
== and != for equality comparison.%includes% (or interval_includes()) to
test whether an interval contains a datey or numeric
value.& for intersection: returns an empty collapsed
interval for adjacent intervals, NA_datey_interval_ for
non-intersecting non-adjacent intervals.is_collapsed(), is_proper() and related
predicates.all_of_time and
NA_datey_interval_.seq() is supported for datey and
durationy via a by argument (note:
length.out is not supported).