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Returns the date for given days of the year.
doyday(year, doy)
Year, four digits format. It can have a decimal fraction if day is omitted.
Day of the year [1:366].
returns an object of class POSIXlt.
POSIXlt
as.POSIXlt
# NOT RUN { doyday(2019,58:65) doyday(2019.5) # }
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