These are naive-time and sys-time methods for the arithmetic generics.
When working with zoned times, generally you convert to either sys-time or naive-time, add the duration, then convert back to zoned time. Typically, weeks and days are added in naive-time, and hours, minutes, seconds, and subseconds are added in sys-time.
If you aren't using zoned times, arithmetic on sys-times and naive-time is equivalent.
If you need to add larger irregular units of time, such as months, quarters,
or years, convert to a calendar type with a converter like
# S3 method for clock_time_point add_weeks(x, n, ...) # S3 method for clock_time_point add_days(x, n, ...) # S3 method for clock_time_point add_hours(x, n, ...) # S3 method for clock_time_point add_minutes(x, n, ...) # S3 method for clock_time_point add_seconds(x, n, ...) # S3 method for clock_time_point add_milliseconds(x, n, ...) # S3 method for clock_time_point add_microseconds(x, n, ...) # S3 method for clock_time_point add_nanoseconds(x, n, ...)
A time point vector.
An integer vector to be converted to a duration, or a duration
corresponding to the arithmetic function being used. This corresponds
to the number of duration units to add.
These dots are for future extensions and must be empty.
x after performing the arithmetic.
n are recycled against each other.
library(magrittr) # Say you started with this zoned time, and you want to add 1 day to it x <- as_naive_time(year_month_day(1970, 04, 25, 02, 30, 00)) x <- as_zoned_time(x, "America/New_York") x#> <zoned_time<second><America/New_York>> #>  "1970-04-25 02:30:00-05:00"# Note that there was a daylight saving time gap on 1970-04-26 where # we jumped from 01:59:59 -> 03:00:00. # You can choose to add 1 day in "system time", by first converting to # sys-time (the equivalent UTC time), adding the day, then converting back to # zoned time. If you sat still for exactly 86,400 seconds, this is the # time that you would see after daylight saving time adjusted the clock # (note that the hour field is shifted forward by the size of the gap) as_sys_time(x)#> <time_point<sys><second>> #>  "1970-04-25 07:30:00"#> <zoned_time<second><America/New_York>> #>  "1970-04-26 03:30:00-04:00"# Alternatively, you can add 1 day in "naive time". Naive time represents # a clock time with a yet-to-be-specified time zone. It tries to maintain # smaller units where possible, so adding 1 day would attempt to return # "1970-04-26T02:30:00" in the America/New_York time zone, but... as_naive_time(x)#> <time_point<naive><second>> #>  "1970-04-25 02:30:00"#> Error : Nonexistent time due to daylight saving time at location 1. #> ℹ Resolve nonexistent time issues by specifying the `nonexistent` argument.# ...this time doesn't exist in that time zone! It is "nonexistent". # You can resolve nonexistent times by setting the `nonexistent` argument # when converting to zoned time. Let's roll forward to the next available # moment in time. x %>% as_naive_time() %>% add_days(1) %>% as_zoned_time(zoned_time_zone(x), nonexistent = "roll-forward")#> <zoned_time<second><America/New_York>> #>  "1970-04-26 03:00:00-04:00"