splusTimeDate (version 2.5.8)

timeRelative: Constructor Function for timeRelative Class

Description

Construct a timeRelative object.

Usage

timeRelative(x, holidays., by, k.by=1, align.by=FALSE, week.day=NULL)

Value

returns a timeRelative object with the given strings as data, and holidays, if given. Otherwise, the strings default to empty, and the holidays to no holidays.

Arguments

x

a character string vector representing relative times.

holidays.

a time/date or time sequence object giving holiday dates.

by

as an alternate to providing a character string vector, you can provide by, k.by, align.by, and week.day if you need to construct a timeRelative object.

by is one of the following character strings, giving the time units for the relative time:

   "milliseconds"
   "ms"
   "seconds" or "sec"
   "minutes" or "min"
   "hours" or "hr"
   "days" or "day"
   "weekdays" or "wkd"
   "bizdays" or "biz"
   "weeks" or "wk"
   "tdy" (for 10-day periods in a month)
   "months" or "mth"
   "quarters" or "qtr"
   "years" or "yr"
   

To add or subtract specific days of the week, use

   "sun"
   "mon"
   "tue"
   "wed"
   "thu"
   "fri"
   "sat"
   

See timeRelative-class for more information on these arguments.

k.by

a non-zero integer specifying the number of by time units in the relative time.

align.by

a logical value. If TRUE, specifies using alignment (see documentation on the relative time class).

week.day

if not NULL, and by is "weeks", you can supply a character string (or an integer 0 to 6, with 0 being Sunday) to specify a weekday for the relative time. The character string must be sufficient to make a unique case-insensitive match to the strings in timeDateOptions("time.day.name").

See Also

timeRelative

Examples

# Create a relative time object that you could add to a time/date object
# to take each element to the third Friday of the month
rtobj <- timeRelative("-a0mth -1fri +3fri")
timeDate(c("1/5/1998", "2/26/1998"), format = "%a %m/%d/%Y") + rtobj
# Create a relative time object for 3 minutes
timeRelative(by="minutes", k.by=3)