To cite package ‘CFtime’ in publications use:

  Van Laake P (2026). _CFtime: Using CF-Compliant Calendars with
  Climate Projection Data_. R package version 1.7.3.9000,
  <https://github.com/r-cf/cftime>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {CFtime: Using CF-Compliant Calendars with Climate Projection Data},
    author = {Patrick {Van Laake}},
    year = {2026},
    note = {R package version 1.7.3.9000},
    url = {https://github.com/r-cf/cftime},
  }