diff --git a/src/EDTFUtils.php b/src/EDTFUtils.php
index c8bd6c5..3176550 100644
--- a/src/EDTFUtils.php
+++ b/src/EDTFUtils.php
@@ -216,6 +216,9 @@ public static function validateDate($datetime_str, $strict = FALSE) {
     elseif (strlen(ltrim($parsed_date[self::YEAR_BASE], '-')) > 4) {
       $msgs[] = "Years longer than 4 digits must be prefixed with a 'Y'.";
     }
+    elseif (strlen($parsed_date[self::YEAR_BASE]) < 4) {
+      $msgs[] = "Years must be at least 4 characters long.";
+    }
     $strict_pattern = 'Y';
 
     // Month.
diff --git a/tests/src/Kernel/EdtfUtilsTest.php b/tests/src/Kernel/EdtfUtilsTest.php
index 685428e..a868901 100644
--- a/tests/src/Kernel/EdtfUtilsTest.php
+++ b/tests/src/Kernel/EdtfUtilsTest.php
@@ -37,8 +37,9 @@ class EdtfUtilsTest extends KernelTestBase {
     '19000' => ['Years longer than 4 digits must be prefixed with a \'Y\'.'],
     'Y19000' => [],
     '190u' => ['Could not parse the date \'190u\'.'],
-    '190' => [],
+    '190' => ['Years must be at least 4 characters long.'],
     '190-99-52' => [
+      'Years must be at least 4 characters long.',
       'Provided month value \'99\' is not valid.',
       'Provided day value \'52\' is not valid.',
     ],
@@ -79,7 +80,7 @@ public function testIso8601() {
       '19000' => '',
       'Y19000' => '19000',
       '190u' => '',
-      '190' => '190',
+      '190' => '',
       '190-99-52' => '',
       '1900-01-02T' => '',
       '1900-01-02T1:1:1' => '',