diff --git a/crates/oxide_builtins/src/temporal.rs b/crates/oxide_builtins/src/temporal.rs
index efc9380c..e2b49ad6 100644
--- a/crates/oxide_builtins/src/temporal.rs
+++ b/crates/oxide_builtins/src/temporal.rs
@@ -1576,6 +1576,67 @@ pub fn zoned_date_time_value_of<H: VmHost>(vm: &mut H, _args: &[u8]) -> NativeRe
     NativeResult::Err(crate::error::create_type_error(vm, "Temporal.ZonedDateTime has no valueOf"))
 }
 
+/// `Temporal.ZonedDateTime.prototype.withTimeZone(timeZone)`：返回同一 instant 换时区槽的新 ZDT。
+///
+/// # 步骤
+/// 1. branding 校验 receiver 为 ZDT。
+/// 2. 读槽 0 epoch 与槽 2 calendar（保不变），参数经 canonical_time_zone 解析新时区。
+/// 3. make_zoned_date_time 重建对象，仅替换时区槽。
+///
+/// # 边界与前提
+/// - 参数须为字符串；非字符串抛 TypeError。无法解析的时区串抛 RangeError。
+/// - epoch 与 calendar 槽原样保留，仅时区 ID 变化。
+pub fn zoned_date_time_with_time_zone<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let ptr = native_try!(receiver_obj(vm, args));
+    let obj = unsafe { &*ptr };
+    native_try!(ensure_zoned_date_time(vm, obj));
+    let Some(epoch_ns) = get_instant_epoch_ns(obj) else {
+        return NativeResult::Err(crate::error::create_range_error(vm, "invalid ZonedDateTime"));
+    };
+    let calendar_id = get_calendar_id(obj, 2);
+    if args.len() < 2 {
+        return NativeResult::Err(crate::error::create_type_error(vm, "timeZone is required"));
+    }
+    let raw = vm.reg(args[1]);
+    if !raw.is_string() {
+        return NativeResult::Err(crate::error::create_type_error(vm, "invalid time zone"));
+    }
+    let input = to_string(raw);
+    let Some((time_zone_id, _)) = canonical_time_zone(&input) else {
+        return NativeResult::Err(crate::error::create_range_error(vm, "invalid time zone"));
+    };
+    make_zoned_date_time(vm, epoch_ns, &time_zone_id, &calendar_id)
+}
+
+/// `Temporal.ZonedDateTime.prototype.equals(other)`：与另一 ZDT 按 epoch/时区/日历三槽比较。
+///
+/// # 边界与前提
+/// - receiver 须为 ZDT，否则 TypeError。
+/// - 参数仅支持 ZDT 对象：三槽（epoch/时区/日历）全等才返回 true。
+/// - 非 ZDT 对象或非对象参数：S3 基础范围外，返回 false（完整比较语义待后续）。
+pub fn zoned_date_time_equals<H: VmHost>(vm: &mut H, args: &[u8]) -> NativeResult {
+    let ptr = native_try!(receiver_obj(vm, args));
+    let obj = unsafe { &*ptr };
+    native_try!(ensure_zoned_date_time(vm, obj));
+
+    let other = if args.len() < 2 { JsValue::undefined() } else { vm.reg(args[1]) };
+    if !other.is_object() {
+        return NativeResult::Ok(JsValue::bool(false));
+    }
+    let other_ptr = other.as_js_object_ptr();
+    if other_ptr.is_null() {
+        return NativeResult::Ok(JsValue::bool(false));
+    }
+    let other_obj = unsafe { &*other_ptr };
+    if !other_obj.is_zoned_date_time_obj() {
+        return NativeResult::Ok(JsValue::bool(false));
+    }
+    let epoch_equal = get_instant_epoch_ns(obj) == get_instant_epoch_ns(other_obj);
+    let zone_equal = to_string(obj.get_prop_at(1)) == to_string(other_obj.get_prop_at(1));
+    let calendar_equal = get_calendar_id(obj, 2) == get_calendar_id(other_obj, 2);
+    NativeResult::Ok(JsValue::bool(epoch_equal && zone_equal && calendar_equal))
+}
+
 /// ZDT 字段 getter 宏：branding 后读本地分量，按选择函数取字段。
 macro_rules! zoned_date_time_parts_getter {
     ($name:ident, $select:expr) => {
diff --git a/crates/oxide_vm/src/bindings/bind_temporal.rs b/crates/oxide_vm/src/bindings/bind_temporal.rs
index b3c38b34..89b56311 100644
--- a/crates/oxide_vm/src/bindings/bind_temporal.rs
+++ b/crates/oxide_vm/src/bindings/bind_temporal.rs
@@ -396,6 +396,16 @@ pub fn bind_temporal(core: &Arc<KernelCore>, session: &KernelSession, global: &m
                 oxide_builtins::temporal::zoned_date_time_value_of::<crate::vm::Vm> as *const (),
                 0,
             ),
+            (
+                "withTimeZone",
+                oxide_builtins::temporal::zoned_date_time_with_time_zone::<crate::vm::Vm> as *const (),
+                1,
+            ),
+            (
+                "equals",
+                oxide_builtins::temporal::zoned_date_time_equals::<crate::vm::Vm> as *const (),
+                1,
+            ),
         ],
     );
 
diff --git a/crates/oxide_vm/tests/builtins_temporal_tests.rs b/crates/oxide_vm/tests/builtins_temporal_tests.rs
index ae32b65b..193d1c21 100644
--- a/crates/oxide_vm/tests/builtins_temporal_tests.rs
+++ b/crates/oxide_vm/tests/builtins_temporal_tests.rs
@@ -1269,3 +1269,68 @@ fn zoned_date_time_to_string_options_validation() {
     .unwrap();
     assert_eq!(str_val(&vm, r), "true|true|true|true");
 }
+
+#[test]
+fn zoned_date_time_with_time_zone_swaps_zone_keeps_instant() {
+    let mut vm = Vm::new();
+    // 换时区后 instant 保留、返回新对象、timeZoneId 更新；大小写不敏感 + ±HH 均可用。
+    let r = eval(
+        &mut vm,
+        "const z = new Temporal.ZonedDateTime(0n, 'UTC');
+         const w = z.withTimeZone('+01:00');
+         w.timeZoneId + '|' + w.epochNanoseconds + '|' +
+         (w !== z) + '|' + z.timeZoneId + '|' +
+         new Temporal.ZonedDateTime(0n, 'uTc').withTimeZone('+01').timeZoneId",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "+01:00|0|true|UTC|+01");
+}
+
+#[test]
+fn zoned_date_time_with_time_zone_bad_receiver_or_zone() {
+    let mut vm = Vm::new();
+    // 非 ZDT receiver 抛 TypeError；非法时区串抛 RangeError；非字符串抛 TypeError。
+    let r = eval(
+        &mut vm,
+        "( () => { try { Temporal.ZonedDateTime.prototype.withTimeZone.call({}, 'UTC'); return 'no-throw'; }
+                   catch (e) { return e instanceof TypeError; } })() + '|' +
+         ( () => { try { new Temporal.ZonedDateTime(0n, 'UTC').withTimeZone('Not/AZone'); return 'no-throw'; }
+                   catch (e) { return e instanceof RangeError; } })() + '|' +
+         ( () => { try { new Temporal.ZonedDateTime(0n, 'UTC').withTimeZone(42); return 'no-throw'; }
+                   catch (e) { return e instanceof TypeError; } })()",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "true|true|true");
+}
+
+#[test]
+fn zoned_date_time_equals_compares_epoch_zone_calendar() {
+    let mut vm = Vm::new();
+    // 同 instant/时区/日历 true；异 instant false；异时区 false；异日历 false。
+    let r = eval(
+        &mut vm,
+        "const a = new Temporal.ZonedDateTime(0n, 'UTC');
+         const b = new Temporal.ZonedDateTime(0n, 'UTC');
+         const c = new Temporal.ZonedDateTime(1n, 'UTC');
+         const d = new Temporal.ZonedDateTime(0n, '-05:00');
+         const e = new Temporal.ZonedDateTime(0n, 'UTC', 'japanese');
+         a.equals(b) + '|' + a.equals(c) + '|' + a.equals(d) + '|' + a.equals(e)",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "true|false|false|false");
+}
+
+#[test]
+fn zoned_date_time_equals_receiver_branding_and_non_zoned_arg() {
+    let mut vm = Vm::new();
+    // 非 ZDT receiver 抛 TypeError；非 ZDT 对象参数返回 false。
+    let r = eval(
+        &mut vm,
+        "( () => { try { Temporal.ZonedDateTime.prototype.equals.call({}, new Temporal.ZonedDateTime(0n, 'UTC')); return 'no-throw'; }
+                   catch (e) { return e instanceof TypeError; } })() + '|' +
+         new Temporal.ZonedDateTime(0n, 'UTC').equals({}) + '|' +
+         new Temporal.ZonedDateTime(0n, 'UTC').equals('2021-01-01T00:00:00+00:00[UTC]')",
+    )
+    .unwrap();
+    assert_eq!(str_val(&vm, r), "true|false|false");
+}