seq.POSIXt {base}R Documentation

Generate Regular Sequences of Dates

Description

The method for seq for date-time classes.

Usage

## S3 method for class 'POSIXt':
seq(from, to, by, length.out = NULL, along.with = NULL, ...)

Arguments

from starting date. Required.
to end date. Optional.
by increment of the sequence. Optional. See Details.
length.out integer, optional. desired length of the sequence.
along.with take the length from the length of this argument.
... arguments passed to or from other methods.

Details

by can be specified in several ways.

The difference between "day" and "DSTday" is that the former ignores changes to/from daylight savings time and the latter takes the same clock time each day. ("week" ignores DST, but "7 DSTdays") can be used as an alternative. "month" and "year" allow for DST.)

Value

A vector of class "POSIXct".

See Also

DateTimeClasses

Examples

## first days of years
seq(ISOdate(1910,1,1), ISOdate(1999,1,1), "years")
## by month
seq(ISOdate(2000,1,1), by = "month", length = 12)
## quarters
seq(ISOdate(1990,1,1), ISOdate(2000,1,1), by = "3 months")
## days vs DSTdays
seq(ISOdate(2000,3,20), by = "day", length = 10)
seq(ISOdate(2000,3,20), by = "DSTday", length = 10)
seq(ISOdate(2000,3,20), by = "7 DSTdays", length = 4)

[Package base version 2.1.0 Index]