Java library for dealing with win32 FILETIME?

Question

Are there any Java libraries around for dealing with the win32 FILETIME/ time intervals ? It\'s basically a 64 bit timestamp in 100ns intervals since January 1, 1601.

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Answer 1

Here's a Java 8+ java.time based solution that keeps 100-nanosecond precision:

public static final Instant ZERO = Instant.parse("1601-01-01T00:00:00Z");

public static long fromInstant(Instant instant) {
    Duration duration = Duration.between(ZERO, instant);
    return duration.getSeconds() * 10_000_000 + duration.getNano() / 100;
}

public static Instant toInstant(long fileTime) {
    Duration duration = Duration.of(fileTime / 10, ChronoUnit.MICROS).plus(fileTime % 10 * 100, ChronoUnit.NANOS);
    return ZERO.plus(duration);
}