app/src/main/java/it/niedermann/nextcloud/deck/api/GsonUTCDateAdapter.java


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package it.niedermann.nextcloud.deck.api;

import com.google.gson.JsonDeserializationContext;
import com.google.gson.JsonDeserializer;
import com.google.gson.JsonElement;
import com.google.gson.JsonParseException;
import com.google.gson.JsonPrimitive;
import com.google.gson.JsonSerializationContext;
import com.google.gson.JsonSerializer;

import java.lang.reflect.Type;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;

import it.niedermann.nextcloud.deck.DeckLog;

public class GsonUTCDateAdapter implements JsonSerializer<Date>, JsonDeserializer<Date> {

    private final DateFormat dateFormat;

    public GsonUTCDateAdapter() {
      //This is the format I need
      dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", Locale.US);
      //This is the key line which converts the date to UTC which cannot be accessed with the default serializer
      dateFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
    }

    @Override public synchronized JsonElement serialize(Date date, Type type, JsonSerializationContext jsonSerializationContext) {
        if (dateFormat.format(date).contains("31")){
            DeckLog.log("date-handling: (serialize) Input: \""+date+"\" | output: "+dateFormat.format(date));
        }
        return new JsonPrimitive(dateFormat.format(date));
    }

    @Override public synchronized Date deserialize(JsonElement jsonElement, Type type, JsonDeserializationContext jsonDeserializationContext) {
      try {
          DeckLog.log("date-handling: (deserialize) Input: \""+jsonElement.getAsString()+"\" | output: "+dateFormat.parse(jsonElement.getAsString()));
        return dateFormat.parse(jsonElement.getAsString());
      } catch (ParseException e) {
        throw new JsonParseException(e);
      }
    }
}