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lubridate (version 0.1)

Make dealing with dates a little easier

Description

Lubridate makes it easier to work with dates and times by providing functions to identify and parse date-time data, extract and modify components of a date-time (years, months, days, hours, minutes, and seconds), perform accurate math on date-times, handle time zones and Daylight Savings Time. Lubridate has a consistent, memorable syntax, that makes working with dates fun instead of frustrating.

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Version

Install

install.packages('lubridate')

Monthly Downloads

916,030

Version

0.1

License

GPL

Maintainer

Hadley Wickham

Last Published

August 15th, 2010

Functions in lubridate (0.1)

is.instant

Is x a date-time object?
am

Does date time occur in the am or pm?
second

Get/set seconds component of a date-time.
add_period_to_date

Addition for the duration (i...
duration

Description of time span classes in lubridate.
is.period

Is x a period object?
floor_date

Round date-times down.
seconds

Quickly create relative timespans.
parse_unit_spec

Internal function.
is.difftime

Is x a duration (difftime) object?
minute

Get/set minutes component of a date-time.
sundays

Quickly create common epoch objects...
make_difftime

Makes a difftime object from given number of seconds...
add_epoch_to_date

Add epochs to dates...
pretty.month

Internal function...
hour

Get/set hours component of a date-time.
lakers

Lakers 2008-2009 basketball data set...
hms

Create a period with the specified hours, minutes, and seconds...
ymd_hms

Parse dates that appear in standard POSIXt order...
ceiling_date

Round date-times up.
eseconds

Quickly create exact time spans.
is.POSIXt

Is x a POSIXct or POSIXlt object?
is.interval

Is x an interval object?
force_tz

Replace time zone to create new date-time...
new_duration

Create a duration object.
combine

Internal function.
wday

Get/set days component of a date-time.
is.timespan

Is x a length of time?
ms

Create a period with the specified number of minutes and seconds...
pretty.point

Internal function...
make_format

Make format...
recognize

Internal function.
print.interval

Internal function for printing interval objects.
find_separator

Identifies the likely separators of a string.
now

The current time...
new_period

Create a period object.
origin

1970-01-01 GMT...
DateCoercion

Convert every date method we know about to POSIXlt and POSIXct...
new_interval

Create an interval object.
is.Date

Is x a Date object?
decimal_date

Converts a date to a decimal of its year.
yday

Get/set days component of a date-time.
pretty.year

Internal function...
parse_date

Change dates into a POSIXct format...
ymd

Parse dates according to the order that year, month, and day elements appear...
new_epoch

Create an epoch object...
pretty.dates

Computes attractive axis breaks for date-time data...
as.POSIXt

Internal function.
guess_format

Guess the format of dates in a character or numeric vector...
format.period

Internal function.
subtract_dates

Subtraction for the duration (i...
with_tz

Get date-time in a different time zone...
week

Get/set weeks component of a date-time.
hm

Create a period with the specified number of hours and minutes...
leap.year

Is a year a leap year?
pretty.sec

Internal function...
print.period

Internal method for printing interval objects.
update.POSIXct

Changes the components of a date object...
pretty.min

Internal function...
pretty.day

Internal function...
month

Get/set months component of a date-time.
standardise_difftime_names

Internal function.
format.interval

Internal function.
tz

Get/set time zone component of a date-time.
today

The current date...
as.duration

Change an object to a duration (difftime).
dst

Get Daylight Savings Time indicator of a date-time.
as.interval

Change an object to an interval.
pretty.hour

Internal function...
pretty.unit

Internal function...
as.period

Change an object to a period.
reclass_date

Convenience method to reclass dates post-modification.
num_to_date

Internal function...
year

Get/set years component of a date-time.
division

Division for period, and interval classes.
round_date

Rounding for date-times.
multiply

Multiplication for period and interval classes.
standardise_date_names

Internal function...