diff --git a/test/built-ins/Temporal/Now/plainDateTimeISO/timezone-string-datetime.js b/test/built-ins/Temporal/Now/plainDateTimeISO/timezone-string-datetime.js
index 5c1515d888..f2525a95a5 100644
--- a/test/built-ins/Temporal/Now/plainDateTimeISO/timezone-string-datetime.js
+++ b/test/built-ins/Temporal/Now/plainDateTimeISO/timezone-string-datetime.js
@@ -14,10 +14,19 @@ assert.throws(RangeError, () => Temporal.Now.plainDateTimeISO({ timeZone }), "ba
 
 [
   "2021-08-19T17:30Z",
+  "2021-08-19T1730Z",
   "2021-08-19T17:30-07:00",
+  "2021-08-19T1730-07:00",
+  "2021-08-19T17:30-0700",
+  "2021-08-19T1730-0700",
   "2021-08-19T17:30[America/Vancouver]",
+  "2021-08-19T1730[America/Vancouver]",
   "2021-08-19T17:30Z[America/Vancouver]",
+  "2021-08-19T1730Z[America/Vancouver]",
   "2021-08-19T17:30-07:00[America/Vancouver]",
+  "2021-08-19T1730-07:00[America/Vancouver]",
+  "2021-08-19T17:30-0700[America/Vancouver]",
+  "2021-08-19T1730-0700[America/Vancouver]",
 ].forEach((timeZone) => {
   Temporal.Now.plainDateTimeISO(timeZone);
   Temporal.Now.plainDateTimeISO({ timeZone });