private void addTypeAdaptersForDate(String datePattern, int dateStyle, int timeStyle, List<TypeAdapterFactory> factories) { DefaultDateTypeAdapter dateTypeAdapter; if (datePattern != null && !"".equals(datePattern.trim())) { dateTypeAdapter = new DefaultDateTypeAdapter(datePattern); } else if (dateStyle != DateFormat.DEFAULT && timeStyle != DateFormat.DEFAULT) { dateTypeAdapter = new DefaultDateTypeAdapter(dateStyle, timeStyle); } else { return; } factories.add(TreeTypeAdapter.newFactory(TypeToken.get(Date.class), dateTypeAdapter)); factories.add(TreeTypeAdapter.newFactory(TypeToken.get(Timestamp.class), dateTypeAdapter)); factories.add(TreeTypeAdapter.newFactory(TypeToken.get(java.sql.Date.class), dateTypeAdapter)); } }