r-cran-clock binary package in Ubuntu Lunar amd64

 Provides a comprehensive library for date-time manipulations
 using a new family of orthogonal date-time classes (durations, time
 points, zoned-times, and calendars) that partition responsibilities so
 that the complexities of time zones are only considered when they are
 really needed. Capabilities include: date-time parsing, formatting,
 arithmetic, extraction and updating of components, and rounding.

Source package