parse_date_time() cannot match missing zeroes

[AlbertRapp]

The docs state that the "H" order stands for "Hours as decimal number (00--24 or 0--24)." Same thing for minutes "M".

In my understanding, the order combination "HM" should match texts such as "501" since the hours fall into the category 0--24.

# Current behavior
lubridate::parse_date_time('501', 'HM')
#> Warning: All formats failed to parse. No formats found.
#> [1] NA


# Expected result
lubridate::parse_date_time('0501', 'HM')
#> [1] "0-01-01 05:01:00 UTC"

^{Created on 2023-12-11 with reprex v2.0.2}

Session info

sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#>  setting  value
#>  version  R version 4.3.2 (2023-10-31)
#>  os       Ubuntu 22.04.3 LTS
#>  system   x86_64, linux-gnu
#>  ui       X11
#>  language (EN)
#>  collate  en_US.UTF-8
#>  ctype    en_US.UTF-8
#>  tz       Europe/Berlin
#>  date     2023-12-11
#>  pandoc   3.1.8 @ /usr/lib/rstudio/resources/app/bin/quarto/bin/tools/x86_64/ (via rmarkdown)
#> 
#> ─ Packages ───────────────────────────────────────────────────────────────────
#>  package     * version    date (UTC) lib source
#>  cli           3.6.1      2023-03-23 [1] CRAN (R 4.3.0)
#>  digest        0.6.33     2023-07-07 [1] CRAN (R 4.3.1)
#>  evaluate      0.22       2023-09-29 [1] CRAN (R 4.3.1)
#>  fastmap       1.1.1      2023-02-24 [1] CRAN (R 4.3.0)
#>  fs            1.6.3      2023-07-20 [1] CRAN (R 4.3.1)
#>  generics      0.1.3      2022-07-05 [1] CRAN (R 4.3.0)
#>  glue          1.6.2      2022-02-24 [1] CRAN (R 4.3.0)
#>  htmltools     0.5.6.9001 2023-10-16 [1] Github (rstudio/htmltools@9436031)
#>  knitr         1.44       2023-09-11 [1] CRAN (R 4.3.1)
#>  lifecycle     1.0.4      2023-11-07 [1] CRAN (R 4.3.2)
#>  lubridate     1.9.3      2023-09-27 [1] CRAN (R 4.3.2)
#>  magrittr      2.0.3      2022-03-30 [1] CRAN (R 4.3.0)
#>  purrr         1.0.2      2023-08-10 [1] CRAN (R 4.3.1)
#>  R.cache       0.16.0     2022-07-21 [1] CRAN (R 4.3.1)
#>  R.methodsS3   1.8.2      2022-06-13 [1] CRAN (R 4.3.1)
#>  R.oo          1.25.0     2022-06-12 [1] CRAN (R 4.3.1)
#>  R.utils       2.12.3     2023-11-18 [1] CRAN (R 4.3.2)
#>  reprex        2.0.2      2022-08-17 [1] CRAN (R 4.3.0)
#>  rlang         1.1.2      2023-11-04 [1] CRAN (R 4.3.2)
#>  rmarkdown     2.25       2023-09-18 [1] CRAN (R 4.3.1)
#>  rstudioapi    0.15.0     2023-07-07 [1] CRAN (R 4.3.1)
#>  sessioninfo   1.2.2      2021-12-06 [1] CRAN (R 4.3.1)
#>  styler        1.10.2     2023-12-07 [1] Github (r-lib/styler@10efce2)
#>  timechange    0.2.0      2023-01-11 [1] CRAN (R 4.3.0)
#>  vctrs         0.6.5      2023-12-01 [1] CRAN (R 4.3.2)
#>  withr         2.5.2      2023-10-30 [1] CRAN (R 4.3.1)
#>  xfun          0.40       2023-08-09 [1] CRAN (R 4.3.1)
#>  yaml          2.3.7      2023-01-23 [1] CRAN (R 4.3.0)
#> 
#>  [1] /home/albert/R/x86_64-pc-linux-gnu-library/4.3
#>  [2] /usr/local/lib/R/site-library
#>  [3] /usr/lib/R/site-library
#>  [4] /usr/lib/R/library
#> 
#> ──────────────────────────────────────────────────────────────────────────────