If dates are stored in server time zone (Brazil/Acre), you should load date time from DB, convert it to UTC time zone and send to client. On client side change UTC to local time zone:
Server side:
DateTime dateOnServer = // load date from db
DateTime dateUTC = dateOnServer.withZone(DateTimeZone.UTC); // convert to UTC
String dateAsStringUTC = dateUTC.toString("yyyy-MM-ddTHH:mm:ss");
// send 'dateAsStringUTC' to client
Client side:
String dateAsStringUTC = // receive date from server
DateTimeFormatter dtf = DateTimeFormat.forPattern("yyyy-MM-ddTHH:mm:ss"); // parser for date
DateTime dateOnClient= dtf.parseDateTime(dateAsStringUTC);
// 'dateOnClient' will be in client time zone 'DateTimeZone.getDefault()'
