diff --git a/CRM/Member/BAO/Membership.php b/CRM/Member/BAO/Membership.php
index 6955e696de01..ef643d67e177 100644
--- a/CRM/Member/BAO/Membership.php
+++ b/CRM/Member/BAO/Membership.php
@@ -1181,7 +1181,7 @@ public static function fixMembershipStatusBeforeRenew(&$currentMembership, $chan
           $currentMembership['end_date'],
           $format
         ),
-        'modified_date' => date('Y-m-d H:i:s', CRM_Utils_Time::strtotime($today)),
+        'modified_date' => date('YmdHis', CRM_Utils_Time::strtotime($today)),
         'membership_type_id' => $currentMembership['membership_type_id'],
         'max_related' => $currentMembership['max_related'] ?? 0,
       ];
@@ -2490,7 +2490,7 @@ public static function updateMembershipStatus($deceasedParams, $contactType) {
           'start_date' => CRM_Utils_Date::isoToMysql($dao->start_date),
           'end_date' => CRM_Utils_Date::isoToMysql($dao->end_date),
           'modified_id' => $userId,
-          'modified_date' => CRM_Utils_Time::date('Ymd'),
+          'modified_date' => CRM_Utils_Time::date('YmdHis'),
           'membership_type_id' => $dao->membership_type_id,
           'max_related' => $dao->max_related,
         ];
@@ -2576,7 +2576,7 @@ private static function createMembershipLog($membership, string $logStartDate =
       'status_id' => $membership->status_id,
       'start_date' => $logStartDate,
       'end_date' => CRM_Utils_Date::isoToMysql($membership->end_date),
-      'modified_date' => CRM_Utils_Time::date('Ymd'),
+      'modified_date' => CRM_Utils_Time::date('YmdHis'),
       'membership_type_id' => $membershipTypeID ?? $membership->membership_type_id,
       'max_related' => $membership->max_related,
     ];
diff --git a/CRM/Upgrade/Incremental/php/FiveEightyThree.php b/CRM/Upgrade/Incremental/php/FiveEightyThree.php
index e804ac577ca0..464c76bca1b5 100644
--- a/CRM/Upgrade/Incremental/php/FiveEightyThree.php
+++ b/CRM/Upgrade/Incremental/php/FiveEightyThree.php
@@ -29,6 +29,14 @@ class CRM_Upgrade_Incremental_php_FiveEightyThree extends CRM_Upgrade_Incrementa
    */
   public function upgrade_5_83_alpha1($rev): void {
     $this->addTask(ts('Upgrade DB to %1: SQL', [1 => $rev]), 'runSql', $rev);
+    $this->addTask(
+      'Convert MembershipLog.modified_date to timestamp',
+      'alterColumn',
+      'civicrm_membership_log',
+      'modified_date',
+      "timestamp NULL DEFAULT NULL COMMENT 'Date this membership modification action was logged.'",
+      FALSE
+    );
   }
 
 }
diff --git a/schema/Member/MembershipLog.entityType.php b/schema/Member/MembershipLog.entityType.php
index 633c2c982894..5677c6239fb5 100644
--- a/schema/Member/MembershipLog.entityType.php
+++ b/schema/Member/MembershipLog.entityType.php
@@ -85,7 +85,7 @@
     ],
     'modified_date' => [
       'title' => ts('Membership Change Date'),
-      'sql_type' => 'date',
+      'sql_type' => 'timestamp',
       'input_type' => 'Select Date',
       'description' => ts('Date this membership modification action was logged.'),
       'add' => '1.5',