#' Asign astronomical seasons
#'
#' @param DATES The dates to be binned into seasons
#'
#' @return A character vector of seasons
#' @export
#'
#' @examples getSeason(c("2012-1-15", "2009-4-1", "2015-7-21", "2011-10-21"))
getSeason <- function(DATES) {
WS <- as.Date("2012-12-21", format = "%Y-%m-%d") # Winter Solstice
SE <- as.Date("2012-3-21", format = "%Y-%m-%d") # Spring Equinox
SS <- as.Date("2012-6-21", format = "%Y-%m-%d") # Summer Solstice
FE <- as.Date("2012-9-21", format = "%Y-%m-%d") # Fall Equinox
# Convert dates from any year to 2012 dates
d <- as.Date(strftime(DATES, format="2012-%m-%d"))
ifelse (d >= WS | d < SE, "Winter",
ifelse (d >= SE & d < SS, "Spring",
ifelse (d >= SS & d < FE, "Summer", "Fall")))
}
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