# invisible functions to the general user
# used internally only load in start
is.nanull <- function(x) ifelse(any(is.null(x), is.na(x)), TRUE, FALSE)
numeric_year <- function(x){
y <- as.numeric(format(x, format="%Y"))
doy <- as.numeric(format(x, format="%j")) - 1
ifelse(y %% 4 == 0,
round(y + doy/366, 3),
round(y + doy/365, 3)
)
}
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