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    "older JVMs" as in which ones? Java 1.2 or something? Commented Oct 20, 2017 at 15:07
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    System.nanoTime() was introduced in Java 1.5 in 2004. Java 1.4 extended support in 2013, so it's pretty safe to say System.nanoTime() can now be relied on and this answer is now out of date. Commented Jan 22, 2020 at 16:45