Nothing
date2day <- function(dates, start=NULL, tz="", ...)
{
dates <- as.POSIXlt(dates, tz=tz, ...)
if (is.null(start))
start <- min(dates)
else
start <- as.POSIXlt(start, tz=tz, ...)
out <- as.numeric(difftime(dates, start, units="days"))
return(out)
}
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