[Android Studio] UTC 시간 Local Time으로 변경하기

📝UTC 시간 Local Time으로 변경하기

리사이클러뷰에 데이터를 가져와 표시했는데 시간이 UTC로 되어있어 Local Time으로 변경해줬다

SimpleDateFormat sf;
SimpleDateFormat df;

// UTC > LocalTime
sf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sf.setTimeZone(TimeZone.getTimeZone("UTC"));
df.setTimeZone(TimeZone.getDefault());

try {
    Date date = sf.parse(posting.getCreatedAt());
    holder.txtCreatedAt.setText(df.format(date));
} catch (ParseException e) {

}

 

사용한 전체 코드

public class PostingAdapter extends RecyclerView.Adapter<PostingAdapter.ViewHolder>  {

    Context context;
    ArrayList<Posting> postingList;
    SimpleDateFormat sf;
    SimpleDateFormat df;


    public PostingAdapter(Context context, ArrayList<Posting> postingList) {
        this.context = context;
        this.postingList = postingList;

        // UTC > LocalTime
        sf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
        df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        sf.setTimeZone(TimeZone.getTimeZone("UTC"));
        df.setTimeZone(TimeZone.getDefault());
    }

    @NonNull
    @Override
    public PostingAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.posting_row, parent, false);
        return new PostingAdapter.ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull PostingAdapter.ViewHolder holder, int position) {
        Posting posting = postingList.get(position);

        holder.txtContent.setText(posting.getContent());
        holder.txtEmail.setText(posting.getEmail());

        try {
            Date date = sf.parse(posting.getCreatedAt());
            holder.txtCreatedAt.setText(df.format(date));
        } catch (ParseException e) {

        }

        if (posting.getIsLike() == 1) {
            holder.imgLike.setImageResource(R.drawable.ic_thumb_up_2);
        } else {
            holder.imgLike.setImageResource(R.drawable.ic_thumb_up_1);
        }

        Glide.with(context)
                .load(posting.getImgUrl())
                .placeholder(R.drawable.outline_photo_24)
                .into(holder.imgPhoto);

    }

    @Override
    public int getItemCount() {
        return postingList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        CardView cardView;
        TextView txtContent;
        TextView txtEmail;
        TextView txtCreatedAt;
        ImageView imgLike;
        ImageView imgPhoto;

        public ViewHolder(@NonNull View itemView) {
            super(itemView);

            cardView = itemView.findViewById(R.id.cardView);
            txtContent = itemView.findViewById(R.id.txtContent);
            txtEmail = itemView.findViewById(R.id.txtEmail);
            txtCreatedAt = itemView.findViewById(R.id.txtCreatedAt);
            imgLike = itemView.findViewById(R.id.imgLike);
            imgPhoto = itemView.findViewById(R.id.imgPhoto);

                }
            });
        }
    }

}