Revert "Revert "Update predtimechart.js""

This reverts commit 1875117.

static/resources/predtimechart.js

@@ -19,24 +19,11 @@ function _fetchData(isForecast, targetKey, taskIDs, referenceDate) {
     const taskIDsValsStr = replace_chars(taskIDsValsSorted.join(' '));
 
     let target_path;
-    // Get the reference date for today and use it to find
-    // the correct targets file
-    var now = new Date();
-    const day = now.getDay();
-    var days_to_saturday = 6 - day;
-    if (days_to_saturday < 0) {
-      days_to_saturday = days_to_saturday + 7;
-    }
-    now.setDate(now.getDate() + days_to_saturday);
-    const tagetDate = now.toISOString().split("T")[0];
-
-    const slug = `${targetKeyStr}_${taskIDsValsStr}`;
-    const forecast_file_name = `${slug}_${referenceDate}.json`;
-    const target_file_name = `${slug}_${tagetDate}.json`;
+    const file_name = `${targetKeyStr}_${taskIDsValsStr}_${referenceDate}.json`;
     if (isForecast) {
-        target_path = `${root}/forecasts/${forecast_file_name}`;
+        target_path = `${root}/forecasts/${file_name}`;
     } else {
-        target_path = `${root}/targets/${target_file_name}`;
+        target_path = `${root}/targets/${file_name}`;
     }
     return fetch(target_path);  // Pwomise?
 }