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# Written by Andrew R Sommerlot <andrewrs@vt.edu>, Februrary 2015 #
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#' generates a vector of dates in the swat model IO format
#' @param startDate - Start date for output vector, supports common date formats
#' @param endDate - End date for output vector, supports common date formats
#' @return returns a generated time series of swat IO format dates
#' @examples
#' startDate = '2000-12-28'
#' endDate = '2000-12-29'
#' genSWATdates(startDate=startDate, endDate=endDate)
#' @export
genSWATdates <- function(startDate, endDate){
#get the single date
date <- as.Date(startDate)
#calculate the length of the generated date file
edate <- as.Date(endDate)
dates <- seq.Date(date, edate, by <- 'day')
dates <- as.character(dates)
datesm <- data.frame(matrix(nrow = length(dates), ncol <- 3))
datessplit <- strsplit(dates, '-')
for(i in 1:length(dates)){
datesm[i,1] <- as.numeric(datessplit[[i]][1])
datesm[i,2] <- as.numeric(datessplit[[i]][2])
datesm[i,3] <- as.numeric(datessplit[[i]][3])
}
dates <- datesm
colnames(dates) <- c('year', 'month', 'day')
#Create the 2nd to last data frame for dates
dates.format <- data.frame(matrix(ncol = 2, nrow = nrow(dates)))
colnames(dates.format) <- c('year', 'days')
#create the add days matrix. this defines how many extra days are added given the month
add.days <- data.frame(matrix(ncol = 2, nrow = 12))
colnames(add.days) <- c('month', 'days')
#define the months and corresponing extra days to add. ex.days is calculated by placing the amount of days from the ith-1 month.
ex.days <- c(0,31,59,90,120,151,181,212,243,273,304,334)
months <- c(1,2,3,4,5,6,7,8,9,10,11,12)
#To take care of the leap year change:
leap.years <- vector()
leap.years <- as.numeric(leap.years)
year <- 1900
for(j in 1:900){
year <- year+ (1*4)
leap.years[j] <- year
}
ln.leap.years <- length(leap.years)
for(k in 1:ln.leap.years){
if(dates$year[1] == leap.years[k]){
ex.days[3] <- 29
}
}
#fill in add.days
add.days$month <- months
add.days$days <- ex.days
extra.days <- vector()
extra.days <- as.numeric(extra.days)
ex.day <- 1
#define extra days and fill in the days in dates.format
for(l in 1:nrow(dates)){
month <- dates$month[l]
for(m in 1:12){
if(month == add.days$month[m]){
ex.day <- add.days$days[m]
}
extra.days[l] <- ex.day
}
}
#fill out the day column of dates.format
dates.format$days <- dates$day + extra.days
dates.format$year <- dates$year
#format the day column to '000' format
dates.format$days <- formatC(dates.format$days, width = 3, flag = '0')
#create new column in dates.format that is equivalent to the SWAT date
dates.format$fullDate <- paste(dates.format$year, dates.format$days, sep = "")
date.full <- dates.format$fullDate
return(date.full)
}
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