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javadecimalunix-timestampjava.time.instant

Java Timestamp with Fractional Seconds

How can I print Java Instant as a timestamp with fractional seconds like 1558766955.037 ? The precision needed is to 1/1000, as the example shows.

I tried (double) timestamp.getEpochSecond() + (double) timestamp.getNano() / 1000_000_000, but when I convert it to string and print it, it shows 1.558766955037E9.

Solution

  • The result you're seeing is the secientific (e-) notation of the result you wanted to get. In other words, you have the right result, you just need to properly format it when you print it:

    Instant timestamp = Instant.now();
double d = (double) timestamp.getEpochSecond() + (double) timestamp.getNano() / 1000_000_000;
System.out.printf("%.2f", d);