%m+%                    Add and subtract months to a date without
                        exceeding the last day of the new month
%within%                Does a date (or interval) fall within an
                        interval?
DateTimeUpdate          Changes the components of a date object
Duration-class          Duration class
Interval-class          Interval class
am                      Does date time occur in the am or pm?
as.duration             Change an object to a duration
as.interval             Change an object to an 'interval'
as.period               Change an object to a period
as_date                 Convert an object to a date or date-time
cyclic_encoding         Cyclic encoding of date-times
date                    Get/set date component of a date-time
date_decimal            Converts a decimal to a date
day                     Get/set days component of a date-time
days_in_month           Get the number of days in the month of a
                        date-time
decimal_date            Converts a date to a decimal of its year
dst                     Get *d*aylight *s*avings *t*ime indicator of a
                        date-time
duration                Create a duration object.
fit_to_timeline         Fit a POSIXlt date-time to the timeline
force_tz                Replace time zone to create new date-time
format_ISO8601          Format in ISO8601 character format
guess_formats           Guess possible date-times formats from a
                        character vector
hour                    Get/set hours component of a date-time
interval                Utilities for creation and manipulation of
                        'Interval' objects
is.Date                 Various date utilities
is.POSIXt               Various POSIX utilities
is.difftime             Is x a difftime object?
is.instant              Is x a date-time object?
is.timespan             Is x a length of time?
lakers                  Lakers 2008-2009 basketball data set
leap_year               Is a year a leap year?
local_time              Get local time from a date-time vector.
make_datetime           Efficient creation of date-times from numeric
                        representations
make_difftime           Create a difftime object.
minute                  Get/set minutes component of a date-time
month                   Get/set months component of a date-time
ms                      Parse periods with *h*our, *m*inute, and
                        *s*econd components
now                     The current day and time
origin                  1970-01-01 UTC
parse_date_time         User friendly date-time parsing functions
period                  Create or parse period objects
period_to_seconds       Contrive a period to/from a given number of
                        seconds
pretty_dates            Computes attractive axis breaks for date-time
                        data
quarter                 Get the fiscal quarter and semester of a
                        date-time
rollbackward            Roll backward or forward a date the previous,
                        current or next month
round_date              Round, floor and ceiling methods for date-time
                        objects
second                  Get/set seconds component of a date-time
stamp                   Format dates and times based on human-friendly
                        templates
time_length             Compute the exact length of a time span
timespan                Description of time span classes in lubridate
tz                      Get/set time zone component of a date-time
week                    Get/set weeks component of a date-time
with_tz                 Get date-time in a different time zone
year                    Get/set years component of a date-time
ymd                     Parse dates with *y*ear, *m*onth, and *d*ay
                        components
ymd_hms                 Parse date-times with *y*ear, *m*onth, and
                        *d*ay, *h*our, *m*inute, and *s*econd
                        components.