timeDate (version 4041.110)

timeSequence: Regularly spaced 'timeDate' objects

Description

Create a regularly spaced object of class "timeDate".

Usage

timeSequence(from, to = Sys.timeDate(), by, length.out = NULL,
            format = NULL, zone = "", FinCenter = "")
# S3 method for timeDate
seq(from, to, by, length.out = NULL, along.with = NULL, ...)

Value

an object of class "timeDate"

Arguments

from, to

starting date, required, and end date, optional. If supplied, to must be after (later than) from.

by

• a character string, containing one of "sec", "min", "hour", "day", "week", "month" or "year". This can optionally be preceded by an integer and a space, or followed by "s".

• character string "quarter" that is equivalent to "3 months".

• a number, taken to be in seconds.

• an object of class 'difftime'.

• character string "DSTday" gives a sequence taken at the same clock time every day. Note that on the days when the DST changes, the requested time may not exist or be ambiguous, see the examples.

length.out

integer, optional. Desired length of the sequence, if specified "to" will be ignored.

along.with

Take the length from the length of this argument.

format

the format specification of the input character vector.

zone

the time zone or financial center where the data were recorded.

FinCenter

a character with the location of the financial center named as "continent/city".

...

arguments passed to other methods.

Examples

## timeSequence

## autodetection of format
(t1 <- timeSequence(from = "2004-03-12", to = "2004-04-11"))

stopifnot( ## different formats even:
  identical(t1, timeSequence(from = "2004-03-12", to = "11-Apr-2004")),
  identical(t1, ## explicit format and FinCenter :
      timeSequence(from = "2004-03-12", to = "2004-04-11",
                   format = "%Y-%m-%d", FinCenter = "GMT")))

## observe "switch to summer time":
timeSequence(from = "2004-03-26 05:00:00", to = "2004-04-02 05:00:00",
             zone = "Europe/Zurich", FinCenter = "Europe/Zurich")

## ensure fixed clock time:
timeSequence(from = "2004-03-26 05:00:00", to = "2004-04-01 05:00:00",
             by = "DSTday", zone = "Europe/Zurich", FinCenter = "Europe/Zurich")

## on the day of DST change the time may not exist (notice 2004-03-28 00:00:00):
timeSequence(from = "2004-03-26 01:00:00", to = "2004-04-01 01:00:00",
             by = "DSTday", zone = "Europe/Zurich", FinCenter = "Europe/Zurich")