To cite package ‘datetimeutils’ in publications use:

  Schumann E (2025). _datetimeutils: Utilities for Dates and Times_. R
  package version 0.6-5, ,
  <https://github.com/enricoschumann/datetimeutils>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {datetimeutils: Utilities for Dates and Times},
    author = {Enrico Schumann},
    year = {2025},
    note = {R package version 0.6-5, 
},
    url = {https://github.com/enricoschumann/datetimeutils},
  }