Date/time parsing

ymd() ydm() mdy() myd() dmy() dym() yq()

Parse dates with year, month, and day components

ymd_hms() ymd_hm() ymd_h() dmy_hms() dmy_hm() dmy_h() mdy_hms() mdy_hm() mdy_h() ydm_hms() ydm_hm() ydm_h()

Parse date-times with year, month, and day, hour, minute, and second components.

ms() hm() hms()

Parse periods with hour, minute, and second components

parse_date_time() parse_date_time2() fast_strptime()

User friendly date-time parsing functions

guess_formats()

Guess possible date-times formats from a character vector

Setting, getting, and rounding

year() `year<-`() isoyear() epiyear()

Get/set years component of a date-time

quarter() semester()

Get the fiscal quarter and semester of a date-time

month() `month<-`()

Get/set months component of a date-time

week() `week<-`() isoweek() epiweek()

Get/set weeks component of a date-time

day() mday() wday() qday() yday() `day<-`() `mday<-`() `qday<-`() `wday<-`() `yday<-`()

Get/set days component of a date-time

hour() `hour<-`()

Get/set hours component of a date-time

minute() `minute<-`()

Get/set minutes component of a date-time

second() `second<-`()

Get/set seconds component of a date-time

tz() `tz<-`()

Get/set time zone component of a date-time

Date-time helpers

make_datetime() make_date()

Efficient creation of date-times from numeric representations

date() `date<-`()

Get/set date component of a date-time

is.instant() is.timepoint()

Is x a date-time object?

is.Date() Date() NA_Date_

Various date utilities

is.POSIXt() is.POSIXlt() is.POSIXct() POSIXct() NA_POSIXct_

Various POSIX utilities

now()

The current time

today()

The current date

origin

1970-01-01 UTC

decimal_date()

Converts a date to a decimal of its year

as_date() as_datetime()

Convert an object to a date or date-time

Durations

A ‘duration’ is a timespan measured in seconds.

duration() dseconds() dminutes() dhours() ddays() dweeks() dyears() dmilliseconds() dmicroseconds() dnanoseconds() dpicoseconds() is.duration()

Create a duration object.

is.difftime()

Is x a difftime object?

make_difftime()

Create a difftime object.

as.duration()

Change an object to a duration

Duration-class

Duration class

Periods

A ‘period’ is a timespan defined in civil time (human) units like years, months, and days.

period() is.period() seconds() minutes() hours() days() weeks() years() milliseconds() microseconds() nanoseconds() picoseconds() months(<numeric>)

Create or parse period objects

period_to_seconds() seconds_to_period()

Contrive a period to/from a given number of seconds

as.period()

Change an object to a period

Period-class

Period class

Intervals

An interval is a timespan defined by two date-times.

interval() `%--%` is.interval() int_start() `int_start<-`() int_end() `int_end<-`() int_length() int_flip() int_shift() int_overlaps() int_standardize() int_aligns() int_diff()

Utilities for creation and manipulation of Interval objects

as.interval()

Change an object to an interval

`%within%`

Tests whether a date or interval falls within an interval

Interval-class

Interval class

Timespans

Timespans are the generic concept that underlies durations, periods, and intervals.

timespan

Description of time span classes in lubridate

time_length()

Compute the exact length of a time span

is.timespan()

Is x a length of time?

Other modification functions

update(<POSIXt>)

Changes the components of a date object

fit_to_timeline()

Fit a POSIXlt date-time to the timeline

with_tz()

Get date-time in a different time zone

force_tz() force_tzs()

Replace time zone to create new date-time

round_date() floor_date() ceiling_date()

Round, floor and ceiling methods for date-time objects

pretty_dates()

Computes attractive axis breaks for date-time data

rollback()

Roll back date to last day of previous month

`%m+%` add_with_rollback()

Add and subtract months to a date without exceeding the last day of the new month

local_time()

Get local time from a date-time vector.

Other date-time components

am() pm()

Does date time occur in the am or pm?

days_in_month()

Get the number of days in the month of a date-time

dst()

Get daylight savings time indicator of a date-time

leap_year()

Is a year a leap year?

stamp() stamp_date() stamp_time()

Format dates and times based on human-friendly templates

date_decimal()

Converts a decimal to a date

Data

lakers

Lakers 2008-2009 basketball data set