Lubridate Cheat Sheet

In R

Lubridate is a popular R package that simplifies the process of working with dates and times. It provides a set of functions that make it easy to parse, manipulate, and format date-time objects in R.

It provides functions to convert between time zones and to handle ambiguous times that occur during daylight saving transitions. It can handle dates in formats such as “YYYY-MM-DD” or “MM/DD/YYYY”, and times in formats such as “HH:MM:SS” or “HH:MM”.

This cheat sheet provides an overview of the most commonly used functions in the lubridate package.

Date-Time Constructors

Function	Description
`ymd()`	Create a date from year, month, and day
`mdy()`	Create a date from month, day, and year
`dmy()`	Create a date from day, month, and year
`ymd_hms()`	Create a date-time from year, month, day, hour, minute, and second
`ymd_hm()`	Create a date-time from year, month, day, hour, and minute
`ymd_h()`	Create a date-time from year, month, day, and hour
`ymd()`	Create a date from year, month, and day
`today()`	Get today’s date
`now()`	Get the current date and time

Date-Time Accessors

Function	Description
`year()`	Get the year of a date-time
`month()`	Get the month of a date-time
`day()`	Get the day of a date-time
`hour()`	Get the hour of a date-time
`minute()`	Get the minute of a date-time
`second()`	Get the second of a date-time
`wday()`	Get the day of the week of a date-time
`mday()`	Get the day of the month of a date-time
`yday()`	Get the day of the year of a date-time
`quarter()`	Get the quarter of a date-time
`tz()`	Get the time zone of a date-time

Date-Time Arithmetic

Function	Description
`seconds()`	Add or subtract seconds to a date-time
`minutes()`	Add or subtract minutes to a date-time
`hours()`	Add or subtract hours to a date-time
`days()`	Add or subtract days to a date-time
`weeks()`	Add or subtract weeks to a date-time
`months()`	Add or subtract months to a date-time
`years()`	Add or subtract years to a date-time

Date-Time Formatting

Function	Description
`format()`	Format a date-time object
`strftime()`	Format a date-time object using a C-style format string
`parse_date_time()`	Parse a character string into a date-time object using a specified format string

Time Zones

Function	Description
`with_tz()`	Set the time zone of a date-time object
`force_tz()`	Set the time zone of a date-time object, even if it already has one
`tz()`	Get the time zone of a date-time object
`tz_set()`	Set the default time zone for the R session
`tzones()`	List all available time zones

Durations

Function	Description
`dseconds()`	Create a duration in seconds
`dminutes()`	Create a duration in minutes
`dhours()`	Create a duration in hours
`ddays()`	Create a duration in days
`dweeks()`	Create a duration in weeks
`dmonths()`	Create a duration in months
`dyears()`	Create a duration in years
`duration()`	Create a duration from a numeric value and a unit
`as.duration()`	Convert a time object to a duration object
`as.period()`	Convert a duration object to a period object

Periods

Function	Description
`years()`	Create a period of years
`quarters()`	Create a period of quarters
`months()`	Create a period of months
`weeks()`	Create a period of weeks
`days()`	Create a period of days
`hours()`	Create a period of hours
`minutes()`	Create a period of minutes
`seconds()`	Create a period of seconds
`period()`	Create a period from a numeric value and a unit
`as.period()`	Convert a duration object to a period object
`as.duration()`	Convert a period object to a duration object

References

lubridate documentation: https://lubridate.tidyverse.org/

Stringr Cheat Sheet

Tidyverse Cheat Sheet