and set a 3-year default date range for monthly data in the UI.

funs/plot_weather_jma.R

@@ -377,6 +377,8 @@ create_sunshine_plot_jma <- function(df, resolution = NULL) {
 
     date_range_str <- paste(format(min(df$DateTime), "%d %b %Y"), "-", format(max(df$DateTime), "%d %b %Y"))
     unit <- if (col == "Sunshine_Hours") "hours" else "min"
+    
+
 
     plotly::plot_ly(data = df, x = ~DateTime, y = as.formula(paste0("~", col)), type = "bar",
         name = "Sunshine",

server.R

@@ -303,7 +303,15 @@ server <- function(input, output, session) {
         end <- as.Date(input$filter_dates[2])
         
         # When changing resolution, usually we want to keep the End date and adjust Start if needed
-        res <- check_and_limit_dates(start, end, input$filter_res, anchor = "end")
+        res_val <- input$filter_res
+        
+        if (res_val == "Monthly") {
+             # Special rule for Monthly: Always default to 3 years back
+             new_start <- end - 365 * 3
+             res <- list(start = new_start, end = end, limited = TRUE, msg = "3 years")
+        } else {
+             res <- check_and_limit_dates(start, end, res_val, anchor = "end")
+        }
         
         if (res$limited) {
              updateDateRangeInput(session, "filter_dates", start = res$start, end = res$end)