如何从android向后台发送ISO格式的数据？

SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
isoFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
String isoDate = isoFormat.format(new Date());

URL url = new URL("http://example.com/api/endpoint");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
connection.setDoOutput(true);

JSONObject requestData = new JSONObject();
requestData.put("data", isoDate);

OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write(requestData.toString());
writer.flush();

int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
    // 请求成功
    // 处理响应数据
} else {
    // 请求失败
    // 处理错误
}

writer.close();
connection.disconnect();