diff --git a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
index a045a5d5a1..b84d9f0370 100644
--- a/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ChainAdapter.php
@@ -74,11 +74,7 @@ class ChainAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
                 $item->metadata = $item->newMetadata = $sourceItem->metadata = $sourceMetadata;
 
                 if (isset($item->metadata[CacheItem::METADATA_EXPIRY])) {
-                    if (\is_int($expiry = $item->metadata[CacheItem::METADATA_EXPIRY])) {
-                        $item->expiresAt(\DateTime::createFromFormat('U', $expiry));
-                    } else {
-                        $item->expiresAt(\DateTime::createFromFormat('U.u', sprintf('%.3F', $expiry)));
-                    }
+                    $item->expiresAt(\DateTime::createFromFormat('U.u', sprintf('%.6F', $item->metadata[CacheItem::METADATA_EXPIRY])));
                 } elseif (0 < $defaultLifetime) {
                     $item->expiresAfter($defaultLifetime);
                 }
diff --git a/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php b/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
index b126b5a7c8..8fd6f47451 100644
--- a/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
+++ b/src/Symfony/Component/Cache/Adapter/ProxyAdapter.php
@@ -88,7 +88,7 @@ class ProxyAdapter implements AdapterInterface, CacheInterface, PruneableInterfa
                     $item["\0*\0value"] = ["\x9D".pack('VN', (int) (0.1 + $metadata[self::METADATA_EXPIRY] - self::METADATA_EXPIRY_OFFSET), $metadata[self::METADATA_CTIME])."\x5F" => $item["\0*\0value"]];
                 }
                 $innerItem->set($item["\0*\0value"]);
-                $innerItem->expiresAt(null !== $item["\0*\0expiry"] ? \DateTime::createFromFormat('U.u', sprintf('%.6f', 0 === $item["\0*\0expiry"] ? \PHP_INT_MAX : $item["\0*\0expiry"])) : null);
+                $innerItem->expiresAt(null !== $item["\0*\0expiry"] ? \DateTime::createFromFormat('U.u', sprintf('%.6F', 0 === $item["\0*\0expiry"] ? \PHP_INT_MAX : $item["\0*\0expiry"])) : null);
             },
             null,
             CacheItem::class