getSeason <- function(DATES) {
WS <- as.Date("2012-12-15", format = "%Y-%m-%d") # Winter Solstice
SE <- as.Date("2012-3-15", format = "%Y-%m-%d") # Spring Equinox
SS <- as.Date("2012-6-15", format = "%Y-%m-%d") # Summer Solstice
FE <- as.Date("2012-9-15", 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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