diff --git a/src/V3/DatetimeVariable.php b/src/V3/DatetimeVariable.php
index 884a46a..754d231 100644
--- a/src/V3/DatetimeVariable.php
+++ b/src/V3/DatetimeVariable.php
@@ -55,8 +55,11 @@ public function init(...$params)
         $this->_hms->init($show_seconds);
     }
 
-    public function isValid(Horde_Variables|Variables $vars, $date): bool
+    public function isValid(Horde_Variables|Variables $vars, $value): bool
     {
+        /* Local alias keeps the parameter name aligned with the parent and
+         * sibling subclasses while preserving the original body wording. */
+        $date = $value;
         /* Require all fields if one field is not empty */
         if ($this->isRequired() || $this->emptyDateArray($date) != 1 || !$this->emptyTimeArray($date)) {
             $mdy_valid = $this->_mdy->isValid($vars, $date);
diff --git a/src/V3/HourminutesecondVariable.php b/src/V3/HourminutesecondVariable.php
index dfee75c..060f572 100644
--- a/src/V3/HourminutesecondVariable.php
+++ b/src/V3/HourminutesecondVariable.php
@@ -34,8 +34,11 @@ public function init(...$params)
         $this->_show_seconds = $params[0] ?? false;
     }
 
-    public function isValid(Horde_Variables|Variables $vars, $time): bool
+    public function isValid(Horde_Variables|Variables $vars, $value): bool
     {
+        /* Local alias keeps the parameter name aligned with the parent and
+         * sibling subclasses while preserving the original body wording. */
+        $time = $value;
         if (!is_array($time)) {
             if ($this->isRequired()) {
                 return $this->invalid('Please enter a valid time.');
diff --git a/src/V3/MonthdayyearVariable.php b/src/V3/MonthdayyearVariable.php
index e620f9f..36e19fc 100644
--- a/src/V3/MonthdayyearVariable.php
+++ b/src/V3/MonthdayyearVariable.php
@@ -64,8 +64,11 @@ public function init(...$params)
         $this->_format_out = $format_out;
     }
 
-    public function isValid(Horde_Variables|Variables $vars, $date): bool
+    public function isValid(Horde_Variables|Variables $vars, $value): bool
     {
+        /* Local alias keeps the parameter name aligned with the parent and
+         * sibling subclasses while preserving the original body wording. */
+        $date = $value;
         if (!is_array($date)) {
             if ($this->isRequired() && empty($date)) {
                 return $this->invalid('This field is required.');