"PURGE_UNREAD_ARTICLES", "DIGEST_ENABLE", "DIGEST_CATCHUP",
"BLACKLISTED_TAGS", "ENABLE_API_ACCESS", "UPDATE_POST_ON_CHECKSUM_CHANGE",
"DEFAULT_UPDATE_INTERVAL", "USER_TIMEZONE", "SORT_HEADLINES_BY_FEED_DATE",
- "SSL_CERT_SERIAL");
+ "SSL_CERT_SERIAL", "DIGEST_PREFERRED_TIME");
if (!SINGLE_USER_MODE) {