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diff --git a/src/junit/com/jogamp/common/os/TestClock01.java b/src/junit/com/jogamp/common/os/TestClock01.java
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+++ b/src/junit/com/jogamp/common/os/TestClock01.java
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+/**
+ * Author: Sven Gothel <[email protected]>
+ * Copyright (c) 2022-2023 Gothel Software e.K.
+ * Copyright (c) 2022-2023 JogAmp Community.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package com.jogamp.common.os;
+
+import java.time.Instant;
+import java.time.ZoneOffset;
+import java.time.temporal.ChronoUnit;
+
+import org.junit.Assert;
+import org.junit.FixMethodOrder;
+import org.junit.Test;
+import org.junit.runners.MethodSorters;
+
+import com.jogamp.common.util.TSPrinter;
+import com.jogamp.junit.util.JunitTracer;
+
+@FixMethodOrder(MethodSorters.NAME_ASCENDING)
+public class TestClock01 extends JunitTracer {
+    TSPrinter logout = TSPrinter.stderr();
+
+    @Test
+    public void test00()  {
+        Platform.initSingleton();
+        TSPrinter.print(System.err, "test00\n");
+
+        final Instant m_t0 = Instant.ofEpochMilli(Clock.currentTimeMillis());
+        final Instant m_t1 = Clock.getMonotonicTime();
+        final Instant w_t2 = Instant.ofEpochSecond(Clock.wallClockSeconds());
+        final Instant w_t3 = Clock.getWallClockTime();
+
+        try {
+            Thread.sleep(100);
+        } catch (final InterruptedException e) { }
+
+        final Instant m_t0_b = Instant.ofEpochMilli(Clock.currentTimeMillis());
+        final Instant m_t1_b = Clock.getMonotonicTime();
+        final Instant w_t2_b = Instant.ofEpochSecond(Clock.wallClockSeconds());
+        final Instant w_t3_b = Clock.getWallClockTime();
+
+        final long m_t0_d = m_t0.until(m_t0_b, ChronoUnit.MILLIS);
+        final long m_t1_d = m_t1.until(m_t1_b, ChronoUnit.MILLIS);
+        final long w_t2_d = w_t2.until(w_t2_b, ChronoUnit.MILLIS);
+        final long w_t3_d = w_t3.until(w_t3_b, ChronoUnit.MILLIS);
+
+        TSPrinter.printf(System.err, "mono t0 %s, %d ms\n", m_t0.atZone(ZoneOffset.UTC), m_t0_d);
+        TSPrinter.printf(System.err, "mono t1 %s, %d ms\n", m_t1.atZone(ZoneOffset.UTC), m_t1_d);
+        TSPrinter.printf(System.err, "wall t2 %s, %d ms\n", w_t2.atZone(ZoneOffset.UTC), w_t2_d);
+        TSPrinter.printf(System.err, "wall t3 %s, %d ms\n", w_t3.atZone(ZoneOffset.UTC), w_t3_d);
+
+        final long td_min = 50;
+        final long td_max = 150;
+        Assert.assertTrue( td_min <= m_t0_d );
+        Assert.assertTrue( td_max >= m_t0_d );
+
+        Assert.assertTrue( td_min <= m_t1_d );
+        Assert.assertTrue( td_max >= m_t1_d );
+
+        Assert.assertTrue( 0      <= w_t2_d ); // sec granularity only
+        Assert.assertTrue( 1000   >= w_t2_d );
+
+        Assert.assertTrue( td_min <= w_t3_d );
+        Assert.assertTrue( td_max >= w_t3_d );
+    }
+
+    @Test
+    public void test01() {
+        TSPrinter.print(System.err, "test01\n");
+        final long tr0 = Clock.currentMillis(); // relative
+        final long ta0 = Clock.currentTimeMillis(); // absolute
+        final long td_ar = ta0 - tr0;
+        try {
+            Thread.sleep(100);
+        } catch (final InterruptedException e) { }
+        final long td_r = Clock.currentMillis() - tr0; // relative
+        final long td_a = Clock.currentTimeMillis() - ta0; // absolute
+
+        TSPrinter.printf(System.err, "mono ts ms: tr0 rel %d, ta0 abs %d, diff %d\n", tr0, ta0, td_ar);
+        TSPrinter.printf(System.err, "mono td ms: tr* rel %d, ta* abs %d\n", td_r, td_a);
+
+        Assert.assertTrue(td_ar >= 0);
+        Assert.assertTrue(Math.abs(td_r - 100) < 10); // generous 10% error margin
+        Assert.assertTrue(Math.abs(td_a - 100) < 10); // ditto
+    }
+
+    public static void main(final String args[]) {
+        final String tstname = TestClock01.class.getName();
+        org.junit.runner.JUnitCore.main(tstname);
+    }
+
+}