presto-main/src/main/java/io/prestosql/operator/scalar/DateTimeFunctions.java/DateTimeFunctions/localTimestamp
class DateTimeFunctions:    @Description("current timestamp without time zone")
    @ScalarFunction("localtimestamp")
    @SqlType(StandardTypes.TIMESTAMP)
    public static long localTimestamp(ConnectorSession session)
    {
        if (session.isLegacyTimestamp()) {
            return session.getStartTime();
        }
        ISOChronology localChronology = getChronology(session.getTimeZoneKey());
        return localChronology.getZone().convertUTCToLocal(session.getStartTime());
    }