AD til UNIX timestamps

ADUtils.java

package fafafafafafa.useradmin.utils;

public class ADUtils {
    private static final long AD_TO_UNIX_DIFF = 11644473600L;

    private static final long DESI_NS_TO_SEC = 10000000L;

    public static final long AD_MIN_TS = 126865728000000000L;

    public static final long AD_MAX_TS = 9223372036854775807L;

    /**
     * AD Timestamps are calculated from 1st Jan 1601
     * Unix timestamps (Epoch) is calculated from 1st Jan 1970
     * AD Timestamps are in 100 ns precision. (From 100'nanoseconds -> to ms -> to seconds and back to milliseconds)
     *
     * @param adTimestamp raw value of AD timestamp
     * @return Long Instant
     */
    public static long toInstant(long adTimestamp) {
        return ((adTimestamp) / DESI_NS_TO_SEC - AD_TO_UNIX_DIFF) * 1000;
    }

    /**
     * Converting instants to AD TIMESTAMPs unfortunately have a precision loss.
     *
     * @param instant
     * @return
     */
    public static long toADTimestamp(long instant) {
        return (instant / 1000 + AD_TO_UNIX_DIFF) * DESI_NS_TO_SEC;
    }

}