Release Lubridate 1.7.8 · tidyverse/lubridate

(breaking) Year and month durations now assume 365.25 days in a year consistently in conversion and constructors. Particularly dyears(1) == years(1) is now TRUE.
Format and print methods for 0-length objects are more consistent.
New duration constructor dmonths() to complement other duration constructors.
duration() constructor now accepts months and years arguments.
#629 Added format_ISO8601() methods.
#672 Eliminate all partial argument matches
#674 as_date() now ignores the tz argument
#675 force_tz(), with_tz(), tz<- convert dates to date-times
#681 New constants NA_Date_ and NA_POSIXct_ which parallel built-in primitive constants.
#681 New constructors Date() and POSIXct() which parallel built-in primitive constructors.
#695 Durations can now be compared with numeric vectors.
#707 Constructors return 0-length inputs when called with no arguments
#713 (breaking) as_datetime() always returns a POSIXct()
#717 Common generics are now defined in generics dependency package.
#719 Negative Durations are now displayed with leading -.
#829 %within% throws more meaningful messages when applied on unsupported classes
#831 Changing hour, minute or second of Date object now yields POSIXct.
#869 Propagate NAs to all internal components of a Period object

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