diff --git a/src/utils.mjs b/src/utils.mjs
new file mode 100644
index 0000000..3f58fce
--- /dev/null
+++ b/src/utils.mjs
@@ -0,0 +1,20 @@
+export function dentroHorarioExpediente() {
+  const agora = new Date();
+
+  const formatter = new Intl.DateTimeFormat("pt-BR", {
+    timeZone: "America/Cuiaba",
+    hour: "2-digit",
+    minute: "2-digit",
+    hour12: false
+  });
+
+  const horaMinuto = formatter.format(agora);
+  const [hora, minuto] = horaMinuto.split(":").map(Number);
+
+  const minutos = hora * 60 + minuto;
+
+  const inicio = 7 * 60 + 30
+  const fim = 17 * 60 + 30
+
+  return minutos >= inicio && minutos <= fim;
+}