[R] Need help to fix the max date filter problem in the date input

[Biplab Nayak]

Hi All,
I Need a bit of help to fix the code.
Code:
library(readr)
library(shiny)
ttclasses <- read_csv("ttclasses.csv")

#Filter data
library(stringr)
library(dplyr)
ttclasses <-ttclasses %>%
  filter(str_detect(assessment, "Assignment"))
ttclasses <-ttclasses %>%
  filter(str_detect(name, "Name"))

##Remove NA values.
library(tidyverse)
ttclasses <-ttclasses %>% drop_na("score")

#Convert to factor
ttclasses$assessment <- as.factor(ttclasses$assessment)
ttclasses$due_date =  as.Date(ttclasses$due_date, format = "mm/dd/yy")
##ttclasses$name <- as.factor(ttclasses$name)

# Define UI ----
ui <- fluidPage(

  # App title ----
  titlePanel("Assessment Dashboard"),

  # Sidebar layout with input and output definitions ----
  sidebarLayout(

    # Sidebar panel for inputs ----
    sidebarPanel(

      # Input: Selector for variable to plot the grades for the selected
assignment ----
      selectInput("assessment", "Assessment:",
                  c("Assignment 1" = "Assignment 1",
                    "Assignment 2" = "Assignment 2",
                    "Assignment 3" = "Assignment 3",
                    "Assignment 4" = "Assignment 4",
                    "Assignment 5" = "Assignment 5")),
      selectInput("name", "Name:",
                  ttclasses[,2]),

    dateRangeInput("due_date",
                   "Due-Date:",start = max(ttclasses$due_date) ,
                   separator = " - ")
    ),

    # Main panel for displaying outputs ----
    mainPanel(

      # Output: Plot of the requested variable against grade ----
      plotOutput("gradePlot")

    )
  )
)

# Define server logic to plot  ----
server <- function(input, output) {
    output$gradePlot <- renderPlot({
    grade_ad = input$assessment
    boxplot(ttclasses$score[ttclasses$assessment==grade_ad],
frame.plot=FALSE, horizontal=TRUE, col="magenta", main=grade_ad)
    ttclasses <-ttclasses %>%
      filter(ttclasses$due_date >= input$due_date[1] & ttclasses$due_date
<= input$due_date[2])
  })
}

# Create Shiny app ----
shinyApp(ui, server)

Thanks & Regards

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