/usr/lib/R/site-library/chron/INDEX is in r-cran-chron 2.3-49-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | as.chron.yearmon        Convert monthly or quarterly data to chron
chron                   Create a Chronological Object
chron_trans             Coordinates and Positions for Chronological
                        Objects
cut.dates               Create a Factor from a Chron or Dates Object
dates                   Generate Dates and Times Components from Input
day.of.week             Convert between Julian and Calendar Dates
days                    Return Various Periods from a Chron or Dates
                        Object
format.chron            Format a chron object
hours                   Return Hours, Minutes, or Seconds from a Times
                        Object
is.holiday              Find Weekends and Holidays in a Chron or Dates
                        Object
seq.dates               Generate Chron or Dates Sequences
trunc.times             Truncate times Objects
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