diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -348,7 +348,6 @@
     'XsprintfUnknownConversionException' => 'xsprintf/exception/XsprintfUnknownConversionException.php',
   ),
   'function' => array(
-    '_phutil_date_format' => 'utils/viewutils.php',
     '_qsprintf_check_scalar_type' => 'xsprintf/qsprintf.php',
     '_qsprintf_check_type' => 'xsprintf/qsprintf.php',
     'array_fuse' => 'utils/utils.php',
@@ -390,6 +389,7 @@
     'phutil_console_prompt' => 'console/format.php',
     'phutil_console_require_tty' => 'console/format.php',
     'phutil_console_wrap' => 'console/format.php',
+    'phutil_date_format' => 'utils/viewutils.php',
     'phutil_deprecated' => 'moduleutils/moduleutils.php',
     'phutil_error_listener_example' => 'error/phlog.php',
     'phutil_escape_html' => 'markup/render.php',
diff --git a/src/utils/viewutils.php b/src/utils/viewutils.php
--- a/src/utils/viewutils.php
+++ b/src/utils/viewutils.php
@@ -1,6 +1,6 @@
 <?php
 
-function _phutil_date_format($epoch) {
+function phutil_date_format($epoch) {
   $now = time();
   $shift = 30 * 24 * 60 * 60;
   if ($epoch < $now + $shift && $epoch > $now - $shift) {