public static final Integer DEFAULT_DAY_FOR_CLEANUP = 3;

    public static final String FESS_CONF_PATH = "fess.conf.path";

    public static final TimeZone TIMEZONE_UTC = TimeZone.getTimeZone("UTC");

    public static final String LDAP_BASE_DN = "ldap.base.dn";

    public static final String LDAP_SECURITY_PRINCIPAL = "ldap.security.principal";

import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.ConditionQuery;
import org.dbflute.cbean.ckey.ConditionKey;
import org.dbflute.cbean.coption.ConditionOption;

import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.ConditionQuery;
import org.dbflute.cbean.ckey.ConditionKey;
import org.dbflute.cbean.coption.ConditionOption;

import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.dbflute.cbean.ConditionBean;
import org.dbflute.cbean.ConditionQuery;
import org.dbflute.cbean.ckey.ConditionKey;
import org.dbflute.cbean.coption.ConditionOption;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.TimeZone;
import java.util.UUID;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;

        if (date == null) {
            return StringUtil.EMPTY;
        }
        final SimpleDateFormat sdf = new SimpleDateFormat(Constants.ISO_DATETIME_FORMAT);
        sdf.setTimeZone(Constants.TIMEZONE_UTC);
        return sdf.format(date);
    }

    public static String formatDate(final LocalDateTime date) {
        if (date == null) {
            return StringUtil.EMPTY;
        }