presto-main/src/main/java/io/prestosql/operator/scalar/DateTimeFunctions.java/DateTimeFunctions/localTime
class DateTimeFunctions:    @Description("current time without time zone")
    @ScalarFunction("localtime")
    @SqlType(StandardTypes.TIME)
    public static long localTime(ConnectorSession session)
    {
        if (session.isLegacyTimestamp()) {
            return UTC_CHRONOLOGY.millisOfDay().get(session.getStartTime());
        }
        ISOChronology localChronology = getChronology(session.getTimeZoneKey());
        return localChronology.millisOfDay().get(session.getStartTime());
    }