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ymd

Convert ‘YMD’ format number or string to Date efficiently, e.g., 211225 to as.Date("2021-12-25"), using Rust’s standard library. It also provides helper functions to handle Date, e.g., quick finding the beginning or end of the given period, adding months to Date, etc.

It’s similar to the lubridate package but is much lighter and focuses only on Date objects.

Installation

Binary version (no Rust toolchain required)

CRAN provides the binary package. So, if you are on Windows or macOS, the package can be installed via:

If you are on Linux, you can try to use the RSPM (RStudio Package Manager) repo provided by RStudio PBC, via (remember to choose the correct binary repo URL for your platform):

install.packages("ymd", repos = "{RSPM-Repo-URL}")

Source version (Rust toolchain required)

If you want to build the dev version from source, you’ll need the Rust toolchain, which can be installed following the instructions from the Rust book.

After that, you can build the package via:

remotes::install_github("shrektan/ymd")

Use Cases and Benchmarks 

print_bmk <- function(x) {
  x[[1]] <- format(x[[1]])
  x[[5]] <- format(x[[5]])
  rnd <- \(v) if (is.numeric(v)) round(v, 1) else v
  x[, 1:8] |>
    lapply(rnd) |>
    as.data.frame() |>
    knitr::kable() |>
    print()
}
run_bmk <- function(..., time_unit = "us") {
  bench::mark(..., time_unit = time_unit) |> print_bmk()
}

ymd 

x <- c("210101", "21/02/03", "89-1-03", "1989.03.05", "01 02 03")
x <- rep(x, 100)
run_bmk(
  ymd::ymd(x),
  lubridate::ymd(x)
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
ymd::ymd(x) 41.8 43.3 21861.1 810.52KB 2.2 9999 1
lubridate::ymd(x) 1365.3 1534.8 627.8 9.11MB 13.2 286 6 

x <- c(210101, 210224, 211231, 19890103)
x <- rep(x, 100)
run_bmk(
  ymd::ymd(x),
  lubridate::ymd(x)
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
ymd::ymd(x) 4.1 4.8 179995.6 3.17KB 18 9999 1
lubridate::ymd(x) 1688.7 1864.3 508.7 365.38KB 15 237 7 

x <- c("2021-01-01", "2022-12-31", "1995-03-22")
x <- rep(x, 100)
run_bmk(
  ymd::ymd(x),
  clock::as_date(clock::year_month_day_parse(x)),
  lubridate::ymd(x),
  as.Date(x)
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
ymd::ymd(x) 30.5 32.0 30464.0 2.39KB 0.0 10000 0
clock::as_date(clock::year_month_day_parse(x)) 160.6 177.9 3698.0 3.66MB 14.9 1734 7
lubridate::ymd(x) 792.3 930.1 940.8 193.52KB 12.9 436 6
as.Date(x) 1054.4 1090.4 889.7 101.69KB 2.0 441 1 

x <- ymd::ymd(210515) + 1:100
run_bmk(
  ymd::eop$tm(x),
  clock::as_date(clock::calendar_end(clock::as_year_month_day(x), "month")),
  lubridate::ceiling_date(x, "month") - 1
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
ymd::eop$tm(x) 5.8 6.4 148901.5 19.3KB 0.0 10000 0
clock::as_date(clock::calendar_end(clock::as_year_month_day(x), “month”)) 108.9 115.8 7867.6 34.9KB 30.1 3664 14
lubridate::ceiling_date(x, “month”) - 1 35.4 38.0 24469.2 159.5KB 29.4 9988 12

edate 

`%m+%` <- lubridate::`%m+%`
x <- ymd::ymd(c(200115, 200131, 200229, 200331, 200401))
x <- rep(x, 100)
run_bmk(
  ymd::edate(x, 2),
  clock::add_months(x, 2, invalid = "previous"),
  x %m+% months(2)
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
ymd::edate(x, 2) 12.3 13.3 73041.1 6.2KB 0.0 10000 0
clock::add_months(x, 2, invalid = “previous”) 157.2 166.9 5423.6 161KB 25.7 2534 12
x %m+% months(2) 1354.3 1431.7 675.3 496.5KB 6.1 332 3 
run_bmk(
  ymd::edate(x, -12),
  clock::add_months(x, -12, invalid = "previous"),
  x %m+% months(-12)
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
ymd::edate(x, -12) 12.3 13.2 72121.2 3.95KB 7.2 9999 1
clock::add_months(x, -12, invalid = “previous”) 158.5 169.1 5191.7 65.65KB 23.3 2455 11
x %m+% months(-12) 1751.0 1986.7 487.9 310.65KB 9.1 215 4

Extract Date Part 

# tweak from https://github.com/Rdatatable/data.table/pull/5300
set.seed(373L)
x <- as.Date(data.table::as.IDate(sample(seq(-25000, 45000), 1e6, TRUE)))

run_bmk(
  data.table::year(x),
  clock::get_year(x),
  lubridate::year(x),
  funchir::quick_year(x),
  ymd::year(x)
)
#> Warning: Some expressions had a GC in every iteration; so filtering is
#> disabled.
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::year(x) 3353.1 3502.2 260.6 7.64MB 55.7 131 28
clock::get_year(x) 17215.0 18977.2 41.8 30.53MB 39.8 21 20
lubridate::year(x) 205532.1 238408.2 4.3 64.85MB 7.2 3 5
funchir::quick_year(x) 25727.2 27358.1 33.8 22.93MB 9.9 17 5
ymd::year(x) 6806.8 6942.4 140.5 3.82MB 9.9 71 5 
run_bmk(
  data.table::month(x),
  clock::get_month(x),
  lubridate::month(x),
  ymd::month(x)
)
#> Warning: Some expressions had a GC in every iteration; so filtering is
#> disabled.
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::month(x) 19978.4 20979.9 47.7 7.63MB 7.9 24 4
clock::get_month(x) 17698.4 18647.8 48.9 26.71MB 27.4 25 14
lubridate::month(x) 225250.3 254814.8 3.9 103MB 5.9 2 3
ymd::month(x) 7264.4 7476.1 131.6 3.82MB 10.0 66 5 
run_bmk(
  data.table::quarter(x),
  clock::get_quarter(clock::as_year_quarter_day(x)),
  lubridate::quarter(x),
  ymd::quarter(x)
)
#> Warning: Some expressions had a GC in every iteration; so filtering is
#> disabled.
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::quarter(x) 16695.6 17065.9 57.6 7.63MB 6.0 29 3
clock::get_quarter(clock::as_year_quarter_day(x)) 22743.8 24452.2 37.6 26.73MB 19.8 19 10
lubridate::quarter(x) 244914.8 250065.3 4.0 118.29MB 8.0 2 4
ymd::quarter(x) 13689.2 14148.4 69.3 3.82MB 5.9 35 3 
run_bmk(
  data.table::yday(x),
  clock::get_day(clock::as_year_day(x)),
  lubridate::yday(x),
  funchir::quick_yday(x),
  ymd::yday(x)
)
#> Warning: Some expressions had a GC in every iteration; so filtering is
#> disabled.
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::yday(x) 4639.7 4864.0 199.9 7.63MB 13.9 101 7
clock::get_day(clock::as_year_day(x)) 19214.7 21036.1 43.8 22.9MB 12.0 22 6
lubridate::yday(x) 212040.0 214421.6 4.6 64.85MB 6.2 3 4
funchir::quick_yday(x) 22006.7 23076.6 39.8 19.08MB 13.9 20 7
ymd::yday(x) 6828.4 7047.6 140.4 3.82MB 4.0 71 2 
run_bmk(
  data.table::mday(x),
  clock::get_day(x),
  lubridate::mday(x),
  funchir::quick_mday(x),
  ymd::mday(x)
)
#> Warning: Some expressions had a GC in every iteration; so filtering is
#> disabled.
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::mday(x) 19289.1 19788.3 49.2 7.63MB 2.0 25 1
clock::get_day(x) 17082.0 17939.6 54.7 26.71MB 19.5 28 10
lubridate::mday(x) 207501.9 222374.2 4.4 57.22MB 4.4 3 3
funchir::quick_mday(x) 9333.4 10908.9 81.9 7.65MB 8.0 41 4
ymd::mday(x) 7366.5 9651.2 99.6 3.82MB 2.0 51 1 
run_bmk(
  data.table::wday(x),
  clock::weekday_code(clock::as_weekday(x)),
  lubridate::wday(x),
  ymd::wday(x)
)
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::wday(x) 1671.6 2153.2 363.4 7.63MB 30.9 153 13
clock::weekday_code(clock::as_weekday(x)) 10204.5 13697.9 69.3 22.91MB 24.9 25 9
lubridate::wday(x) 258137.3 258137.3 3.9 64.85MB 3.9 1 1
ymd::wday(x) 9279.6 10908.8 89.6 3.82MB 6.6 41 3 
run_bmk(
  data.table::isoweek(x),
  clock::get_week(clock::as_iso_year_week_day(x)),
  lubridate::isoweek(x),
  ymd::isoweek(x)
)
#> Warning: Some expressions had a GC in every iteration; so filtering is
#> disabled.
expression min median itr.sec mem_alloc gc.sec n_itr n_gc
data.table::isoweek(x) 601227.6 601227.6 1.7 122.08MB 6.7 1 4
clock::get_week(clock::as_iso_year_week_day(x)) 31462.4 38713.8 23.4 26.72MB 9.7 12 5
lubridate::isoweek(x) 625706.3 625706.3 1.6 278.5MB 9.6 1 6
ymd::isoweek(x) 9738.4 10692.3 90.7 3.82MB 3.9 46 2

Session Info 

xfun::session_info()
#> R version 4.6.1 (2026-06-24)
#> Platform: aarch64-apple-darwin25.4.0
#> Running under: macOS Tahoe 26.5.2
#>
#> Locale: C.UTF-8 / C.UTF-8 / C.UTF-8 / C / C.UTF-8 / C.UTF-8
#>
#> Package version:
#>   base64enc_0.1.6   bench_1.1.4       bslib_0.12.0      cachem_1.1.0
#>   cli_3.6.6         clock_0.7.4       compiler_4.6.1    cpp11_0.5.5
#>   data.table_1.18.4 digest_0.6.39     evaluate_1.0.5    fastmap_1.2.0
#>   fontawesome_0.5.3 fs_2.1.0          funchir_0.3.0-1   generics_0.1.4
#>   glue_1.8.1        graphics_4.6.1    grDevices_4.6.1   highr_0.12
#>   htmltools_0.5.9   jquerylib_0.1.4   jsonlite_2.0.0    knitr_1.51
#>   lifecycle_1.0.5   lubridate_1.9.5   magrittr_2.0.5    memoise_2.0.1
#>   methods_4.6.1     mime_0.13         otel_0.2.0        pillar_1.11.1
#>   pkgconfig_2.0.3   profmem_0.7.0     R6_2.6.1          rappdirs_0.3.4
#>   rlang_1.3.0       rmarkdown_2.31    sass_0.4.10       stats_4.6.1
#>   tibble_3.3.1      timechange_0.4.0  tinytex_0.60      tools_4.6.1
#>   tzdb_0.5.0        utf8_1.2.6        utils_4.6.1       vctrs_0.7.3
#>   xfun_0.60         yaml_2.3.12       ymd_0.1.6