diff -u b/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php b/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php
--- b/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php
+++ b/core/modules/migrate/src/Plugin/migrate/process/FormatDate.php
@@ -15,7 +15,8 @@
  * - from_format: The source format string as accepted by
  *   @link http://php.net/manual/datetime.createfromformat.php \DateTime::createFromFormat. @endlink
  * - to_format: The destination format.
- * - timezone: String identifying the required source time zone, see
+ * - timezone: String identifying the required time zone, see
+ * - from_timezone: String identifying the required source time zone, see
  *   DateTimePlus::__construct().
  * - to_timezone: String identifying the required destination time zone, see
  *   DateTimePlus::__construct().
@@ -56,7 +57,7 @@
  *     plugin: format_date
  *     from_format: 'Y-m-d\TH:i:sO'
  *     to_format: 'Y-m-d\TH:i:s'
- *     timezone: 'America/Managua'
+ *     from_timezone: 'America/Managua'
  *     to_timezone: 'UTC'
  *     settings:
  *       validate_format: false
@@ -94,8 +95,9 @@
 
     $fromFormat = $this->configuration['from_format'];
     $toFormat = $this->configuration['to_format'];
-    $from_timezone = isset($this->configuration['timezone']) ? $this->configuration['timezone'] : NULL;
-    $to_timezone = isset($this->configuration['to_timezone']) ? $this->configuration['to_timezone'] : $from_timezone;
+    $timezone = isset($this->configuration['timezone']) ? $this->configuration['timezone'] : NULL;
+    $from_timezone = isset($this->configuration['from_timezone']) ? $this->configuration['from_timezone'] : $timezone;
+    $to_timezone = isset($this->configuration['to_timezone']) ? $this->configuration['to_timezone'] : NULL;
     $settings = isset($this->configuration['settings']) ? $this->configuration['settings'] : [];
 
     // Attempts to transform the supplied date using the defined input format.
diff -u b/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php b/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php
--- b/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php
+++ b/core/modules/migrate/tests/src/Unit/process/FormatDateTest.php
@@ -111,9 +111,18 @@
       ],
       'timezone' => [
         'configuration' => [
+          'from_format' => 'Y-m-d\TH:i:sO',
+          'to_format' => 'Y-m-d\TH:i:s',
+          'timezone' => 'America/Managua',
+        ],
+        'value' => '2004-12-19T10:19:42-0600',
+        'expected' => '2004-12-19T10:19:42',
+      ],
+      'timezone_from_to' => [
+        'configuration' => [
           'from_format' => 'Y-m-d h:i:s',
           'to_format' => 'Y-m-d h:i:s',
-          'timezone' => 'America/Managua',
+          'from_timezone' => 'America/Managua',
           'to_timezone' => 'UTC',
         ],
         'value' => '2004-12-19 10:19:42',