POSIXlt

Create

Action	Code	Details
From ymd	ISOdate(year, month, day) |> as.POSIXlt()
From ymd	lubridate::make_date(year, month, day) |> as.POSIXlt()
From ymdhms	ISOdatetime(year, month, day, hour, minute, second) |> as.POSIXlt()
From ymdhms in UTC timezone	ISOdatetime(year, month, day, hour, minute, second, tz = 'UTC') |> as.POSIXlt()
Current date in UTC	Sys.Date() |> as.POSIXlt()
Current datetime	Sys.time() |> as.POSIXlt()
Current datetime	lubridate::now() |> as.POSIXlt()
Current datetime in UTC timezone	lubridate::now(tzone = 'UTC') |> as.POSIXlt()
Unix epoch	as.POSIXlt(0)
From total seconds since Unix epoch	as.POSIXlt(n)
Datetime from YYYY-MM-DD string	as.POSIXlt(x)
Datetime from YYYY-MM-DD HH:mm:ss string	as.POSIXlt(x)
Date from DD-MM-YYYY string	as.POSIXlt(x, format = '%d-%m-%Y')

Test

Action	Code	Details
Is POSIXt	inherits(x, 'POSIXt')
Is POSIXt	lubridate::is.POSIXt(x)
Is POSIXlt	inherits(x, 'POSIXlt')
Is POSIXlt	lubridate::is.POSIXlt(x)
Same date	x == y
Happens before y	x < y
Happens after y	x > y

Extract

Action	Code	Details
Days from Unix epoch	as.Date(x) |> as.integer()
Seconds from Unix epoch (timestamp)	as.integer(x)
Year	lubridate::year(x)
Month	lubridate::month(x)
Day	lubridate::day(x)
Week number (1-53)	lubridate::week(x)
ISO week number (1-52)	lubridate::isoweek(x)
Weekday number	lubridate::wday(x, week_start = 1)	Mon=1, Sun=7
Hour	lubridate::hour(x)
Minute	lubridate::minute(x)
Second	lubridate::second(x)

Derive

Action	Code	Details
Shift forward by n seconds	x + n
Truncate to date	trunc(x, 'days')	Drops the time component, falling back to midnight 00:00:00
Truncate to hours	trunc(x, 'hours')
Truncate to minutes	trunc(x, 'mins')

Convert

Action	Code	Details
To Date	as.Date(x)
To POSIXct	as.POSIXct(x)

Format as string

Action	Code	Details
Format as ISO datetime (yyyy-mm-dd HH:MM:SS.SSS)	as.character(x)
Format as yyyy-mm-dd HH:MM:SS	format(x)
Format as yyyy-mm-dd	format(d, '%Y-%m-%d')
Format as dd-mm-yyyy	format(d, '%d-%m-%Y')
Format in system locale	format(x, '%a %b %d')