test: relax Y2K38 check in test-fs-utimes-y2K38

On some platforms `date` may not support the `-r` option. Optimistically
allow the test to proceed in that case as the previous `touch` had
succeeded -- we were just not able to easily validate the file date.

PR-URL: #37825
Refs: #37707
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-fs-utimes-y2K38.js

@@ -1,20 +1,15 @@
 'use strict';
 const common = require('../common');
 
-if (common.isIBMi) {
-  common.skip('fs.utimesSync() currently fails on IBM i with Y2K38 values');
-}
-
 const tmpdir = require('../common/tmpdir');
 tmpdir.refresh();
 
 const assert = require('assert');
 const fs = require('fs');
 
-// Check for Y2K38 support. For Windows and AIX, assume it's there. Windows
+// Check for Y2K38 support. For Windows, assume it's there. Windows
 // doesn't have `touch` and `date -r` which are used in the check for support.
-// AIX lacks `date -r`.
-if (!common.isWindows && !common.isAIX) {
+if (!common.isWindows) {
   const testFilePath = `${tmpdir.path}/y2k38-test`;
   const testFileDate = '204001020304';
   const { spawnSync } = require('child_process');
@@ -25,13 +20,21 @@ if (!common.isWindows && !common.isAIX) {
     common.skip('File system appears to lack Y2K38 support (touch failed)');
   }
 
+  // On some file systems that lack Y2K38 support, `touch` will succeed but
+  // the time will be incorrect.
   const dateResult = spawnSync('date',
                                ['-r', testFilePath, '+%Y%m%d%H%M'],
                                { encoding: 'utf8' });
-
-  assert.strictEqual(dateResult.status, 0);
-  if (dateResult.stdout.trim() !== testFileDate) {
-    common.skip('File system appears to lack Y2k38 support (date failed)');
+  if (dateResult.status === 0) {
+    if (dateResult.stdout.trim() !== testFileDate) {
+      common.skip('File system appears to lack Y2k38 support (date failed)');
+    }
+  } else {
+    // On some platforms `date` may not support the `-r` option. Usually
+    // this will result in a non-zero status and usage information printed.
+    // In this case optimistically proceed -- the earlier `touch` succeeded
+    // but validation that the file has the correct time is not easily possible.
+    assert.match(dateResult.stderr, /[Uu]sage:/);
   }
 }