invalid 
[character(1) / NULL]
One of the following invalid date resolution strategies:

"previous" : The previous valid instant in time.

"previousday" : The previous valid day in time, keeping the time of
day.

"next" : The next valid instant in time.

"nextday" : The next valid day in time, keeping the time of day.

"overflow" : Overflow by the number of days that the input is invalid
by. Time of day is dropped.

"overflowday" : Overflow by the number of days that the input is
invalid by. Time of day is kept.

"NA" : Replace invalid dates with NA .

"error" : Error on invalid dates.
Using either "previous" or "next" is generally recommended, as these
two strategies maintain the relative ordering between elements of the
input.
If NULL , defaults to "error" .
If getOption("clock.strict") is TRUE , invalid must be supplied and
cannot be NULL . This is a convenient way to make production code robust
to invalid dates.

nonexistent 
[character / NULL]
One of the following nonexistent time resolution strategies, allowed to be
either length 1, or the same length as the input:

"rollforward" : The next valid instant in time.

"rollbackward" : The previous valid instant in time.

"shiftforward" : Shift the nonexistent time forward by the size of
the daylight saving time gap.

"shiftbackward : Shift the nonexistent time backward by the size of
the daylight saving time gap.

"NA" : Replace nonexistent times with NA .

"error" : Error on nonexistent times.
Using either "rollforward" or "rollbackward" is generally
recommended over shifting, as these two strategies maintain the
relative ordering between elements of the input.
If NULL , defaults to "error" .
If getOption("clock.strict") is TRUE , nonexistent must be supplied
and cannot be NULL . This is a convenient way to make production code
robust to nonexistent times.

ambiguous 
[character / zoned_time / POSIXct / list(2) / NULL]
One of the following ambiguous time resolution strategies, allowed to be
either length 1, or the same length as the input:

"earliest" : Of the two possible times, choose the earliest one.

"latest" : Of the two possible times, choose the latest one.

"NA" : Replace ambiguous times with NA .

"error" : Error on ambiguous times.
Alternatively, ambiguous is allowed to be a zoned_time (or POSIXct) that
is either length 1, or the same length as the input. If an ambiguous time
is encountered, the zoned_time is consulted. If the zoned_time corresponds
to a naive_time that is also ambiguous and uses the same daylight saving
time transition point as the original ambiguous time, then the offset of
the zoned_time is used to resolve the ambiguity. If the ambiguity cannot be
resolved by consulting the zoned_time, then this method falls back to
NULL .
Finally, ambiguous is allowed to be a list of size 2, where the first
element of the list is a zoned_time (as described above), and the second
element of the list is an ambiguous time resolution strategy to use when
the ambiguous time cannot be resolved by consulting the zoned_time.
Specifying a zoned_time on its own is identical to list(<zoned_time>, NULL) .
If NULL , defaults to "error" .
If getOption("clock.strict") is TRUE , ambiguous must be supplied and
cannot be NULL . Additionally, ambiguous cannot be specified as a
zoned_time on its own, as this implies NULL for ambiguous times that the
zoned_time cannot resolve. Instead, it must be specified as a list
alongside an ambiguous time resolution strategy as described above. This is
a convenient way to make production code robust to ambiguous times.
