보내는 경우 intent.putExtra("키 이름" , "변수/보내려는 값"); Btn2.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent intent = new Intent(SelectActivity.this, UsingActivity.class); intent.putExtra("duration",duration); startActivity(intent); } }); try { SimpleDateFormat dataFormat = new SimpleDateFormat("kk:mm"); Date startDate = dataFormat.parse(getTime2); Date en..