diff --git a/apps/dav/lib/Files/FileSearchBackend.php b/apps/dav/lib/Files/FileSearchBackend.php
index 206d812bd4333..7c51b36976bb0 100644
--- a/apps/dav/lib/Files/FileSearchBackend.php
+++ b/apps/dav/lib/Files/FileSearchBackend.php
@@ -505,16 +505,36 @@ private function castValue(SearchPropertyDefinition $property, $value) {
 			case SearchPropertyDefinition::DATATYPE_NONNEGATIVE_INTEGER:
 				return 0 + $value;
 			case SearchPropertyDefinition::DATATYPE_DATETIME:
-				if (is_numeric($value)) {
-					return max(0, 0 + $value);
-				}
-				$date = \DateTime::createFromFormat(\DateTimeInterface::ATOM, (string)$value);
-				return ($date instanceof \DateTime && $date->getTimestamp() !== false) ? $date->getTimestamp() : 0;
+				return $this->castDateTimeValue($value);
 			default:
 				return $value;
 		}
 	}
 
+	private function castDateTimeValue($value) {
+		if (is_numeric($value)) {
+			return max(0, 0 + $value);
+		}
+
+		$date = \DateTime::createFromFormat(\DateTimeInterface::ATOM, (string)$value);
+		if (!$date instanceof \DateTime) {
+			return 0;
+		}
+
+		try {
+			return $date->getTimestamp();
+		} catch (\Error $e) {
+			if (!$e instanceof \ValueError && !is_a($e, 'DateRangeError')) {
+				throw $e;
+			}
+
+			// On 32-bit PHP, getTimestamp() fails for dates outside the
+			// representable integer range. Clamp broad search bounds instead of
+			// failing the whole WebDAV SEARCH request.
+			return (int) $date->format("Y") >= 2038 ? PHP_INT_MAX : 0;
+		}
+	}
+
 	/**
 	 * Get a specific property from the were clause
 	 */