Almost there

server.go

@@ -43,16 +43,17 @@ func showCharts(w http.ResponseWriter, r *http.Request) {
 }
 
 func sendData(w http.ResponseWriter, r *http.Request) {
-	dateSince := time.Now()
+	dateSince := time.Now().UTC().Format(time.RFC3339Nano)
 	sinceQuery := r.FormValue("since")
 	if sinceQuery != "" {
 		newDateSince, err := time.Parse(time.RFC3339Nano, sinceQuery)
 		if err != nil {
 			http.Redirect(w, r, ROOT_URL, 303)
+			return
 		}
-		dateSince = newDateSince
+		dateSince = newDateSince.Format(time.RFC3339Nano)
 	}
-	records, err := getSnapshotRecordsFromDb(dateSince.String())
+	records, err := getSnapshotRecordsFromDb(dateSince)
 	if internalErrorOnErr(fmt.Errorf("couldn't get snapshots from db: %w", err), w, r) { return }
 	json, err := createJsonFromSnapshotRecords(records)
 	if internalErrorOnErr(fmt.Errorf("couldn't create json from snapshots: %w", err), w, r) { return }