time356: Helper Time-Series Routines
In aparamon/cmrutils: Misc Functions of the Center for Mathematical Research

Description Usage Arguments Details Value See Also Examples

Converts beetween Date objects and sampling times of daily time series with the natural time period of 1 year.

1 2	time365toDate(x) time365fromDate(x)

`x`	A vector of sampling times (`time365toDate`) or dates (`time365fromDate`).

A simple approach to modelling daily time series with the natural time period of 1 year is to use ts object with \code{frequency} = 365, that is to assume no leap days.

time365fromDate returns NA for the leap day February 29.

A vector of dates (time365fromDate) or sampling times (time365toDate).

time.

  ## non-leap year
  x <- ts(1:4, start = c(1991, 58), frequency = 365)
  time365toDate(time(x))
  d <- seq.Date(as.Date('1991-02-27'), as.Date('1991-03-02'), 1)
  time365fromDate(d)

  ## leap year
  x <- ts(1:4, start = c(1992, 58), frequency = 365)
  time365toDate(time(x))
  d <- seq.Date(as.Date('1992-02-27'), as.Date('1992-03-02'), 1)
  time365fromDate(d)

  x <- seq(1900, 2100, by = 1/365)
  stopifnot(all(abs(x - time365fromDate(time365toDate(x))) <
                getOption("ts.eps")))