date.mdy {survival}R Documentation

Convert from Julian Dates to Month, Day, and Year

Description

Convert a vector of Julian dates to a list of vectors with the corresponding values of month, day and year, and optionally weekday.

Usage

date.mdy(sdate, weekday = FALSE)

Arguments

sdate a Julian date value, as returned by mdy.date(), number of days since 1/1/1960.
weekday if TRUE, then the returned list also will contain the day of the week (Sunday=1, Saturday=7).

Value

A list with components month, day, and year.

References

Press, W. H., Teukolsky, S. A., Vetterling, W. T., and Flannery, B. P. (1992). Numerical Recipes: The Art of Scientific Computing (Second Edition). Cambridge University Press.

Examples

day <- 7
temp <- date.mdy(mdy.date(month = 7, day = day, year = 1960))
## Check for illegal dates, such as 29 Feb in a non leap year
if (temp$day != day) {
  cat("Some illegal dates\n")
} else {
  cat("All days are legal\n")
}

[Package survival version 2.17 Index]