Orekit 12.2 Avoiding Deprecated AbsoluteDate Constructor

Orekit usage
1

For implementing a “w” message in the OpenAMIP 1.17 specification [1], I need to calculate utcOffset defined as integer time difference in seconds between UTC time and GPS time at the time the “w” message is sent i.e. java.util.Date now = new java.util.Date().

I wrote the following Orekit code but I see that the AbsoluteDate constructor I’m using for the GPSScale line [2] is deprecated [public AbsoluteDate(final Instant instant, final TimeScale timeScale)]. I’m not sure the correct way to write this code without using this deprecated constructor. Would someone be able to help?

    private long getUtcOffset(TimeUnit timeUnit) {
        GPSScale gps = TimeScalesFactory.getGPS();
        UTCScale utc = TimeScalesFactory.getUTC();
        Instant now = ZonedDateTime.now( ZoneOffset.UTC ).toInstant();
        AbsoluteDate nowUtc = new AbsoluteDate(now, utc);
        AbsoluteDate nowGps = new AbsoluteDate(now, gps); // <<<<< 2
        return nowUtc.durationFrom(nowGps, timeUnit);
    }

1 - https://www.idirect.net/wp-content/uploads/2021/02/OpenAMIP-Standard-Version-1-17-Revision-F.pdf

2

This has been replaced by the more complete GNSSDate class.

3

Thanks @luc. I couldn’t understand how to use GNSSDate so I just switched from using java.time.Instant to java.util.Date in order to avoid the deprecated AbsoluteDate constructor involving Instant.

public static long getUtcOffset(TimeUnit timeUnit) {
            GPSScale gps = TimeScalesFactory.getGPS();
            UTCScale utc = TimeScalesFactory.getUTC();
            Date now = new Date();
            AbsoluteDate nowUtc = new AbsoluteDate(now, utc);
            AbsoluteDate nowGps = new AbsoluteDate(now, gps);
            return nowUtc.durationFrom(nowGps, timeUnit);
}