sun/security/tools/jarsigner/warnings/NoTimestampTest.java failed due to unexpected expiration date

sun/security/tools/jarsigner/warnings/NoTimestampTest.java fails intermittently:

----------System.err:(26/1406)----------
 stdout: [jar signed.

Warning:
No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2019-12-06).

The signer certificate will expire on 2019-12-06.
];
 stderr: []
 exitValue = 0

java.lang.RuntimeException: 'No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (2019-12-05).' missing from stdout/stderr

at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:151)
at Test.checkSigning(Test.java:240)
at NoTimestampTest.start(NoTimestampTest.java:86)
at NoTimestampTest.main(NoTimestampTest.java:49)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:246)
at java.base/java.lang.Thread.run(Thread.java:835)