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#' Extraterrestrial Solar Radiation (ESR) Dates
#'
#' Fix dates for best ESR estimates
#'
#' @import data.table
#' @import pRecipe
#' @importFrom methods as
#' @importFrom raster getZ
#' @param x a character string with the path to the data file.
#' @return data.table
#' @keywords internal
esr_dates <- function(x){
dummie_day_dif <- as.Date('1980-01-02') - as.Date('1980-01-01')
dummie_month_dif <- as.Date('1980-02-01') - as.Date('1980-01-01')
dummie_year_dif1 <- as.Date('1981-01-01') - as.Date('1980-01-01')
dummie_year_dif2 <- as.Date('1982-01-01') - as.Date('1981-01-01')
dummie <- getZ(x)
dummie_dif <- dummie[2] - dummie[1]
if (dummie_dif == dummie_day_dif){
dummie_dates <- dummie
} else if ((dummie_dif > dummie_day_dif) & (dummie_dif <= dummie_month_dif)) {
dummie_dates <- dummie
dummie_dates[month(dummie_dates) == 1] <- sub("\\d{2}$", "17", dummie_dates[month(dummie_dates) == 1])
dummie_dates[month(dummie_dates) == 2] <- sub("\\d{2}$", "16", dummie_dates[month(dummie_dates) == 2])
dummie_dates[month(dummie_dates) == 3] <- sub("\\d{2}$", "16", dummie_dates[month(dummie_dates) == 3])
dummie_dates[month(dummie_dates) == 4] <- sub("\\d{2}$", "15", dummie_dates[month(dummie_dates) == 4])
dummie_dates[month(dummie_dates) == 5] <- sub("\\d{2}$", "15", dummie_dates[month(dummie_dates) == 5])
dummie_dates[month(dummie_dates) == 6] <- sub("\\d{2}$", "11", dummie_dates[month(dummie_dates) == 6])
dummie_dates[month(dummie_dates) == 7] <- sub("\\d{2}$", "17", dummie_dates[month(dummie_dates) == 7])
dummie_dates[month(dummie_dates) == 8] <- sub("\\d{2}$", "16", dummie_dates[month(dummie_dates) == 8])
dummie_dates[month(dummie_dates) == 9] <- sub("\\d{2}$", "15", dummie_dates[month(dummie_dates) == 9])
dummie_dates[month(dummie_dates) == 10] <- sub("\\d{2}$", "15", dummie_dates[month(dummie_dates) == 10])
dummie_dates[month(dummie_dates) == 11] <- sub("\\d{2}$", "14", dummie_dates[month(dummie_dates) == 11])
dummie_dates[month(dummie_dates) == 12] <- sub("\\d{2}$", "10", dummie_dates[month(dummie_dates) == 12])
} else if((dummie_dif == dummie_year_dif1) | (dummie_dif == dummie_year_dif1)){
dummie_dates <- dummie
dummie_dates <- sub("\\-\\d{2}", '-03', dummie_dates)
dummie_dates<- sub("\\d{2}$", "16", dummie_dates)
}
return(dummie_dates)
}
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