Android系统时间无法设置到2038年后问题

原创已于 2025-04-12 11:11:27 修改 · 2.1k 阅读

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#android

于 2023-08-21 23:19:58 首次发布

文章讲述了在Android系统中，AlarmManagerService的kernelTime接口对RTC时间设置了最大值，以及DatePickerFragment中的时间限制，强调了车载系统的特殊需求。开发者需要注意处理时间戳和系统时间设置的边界条件。

在线获取时间戳：https://tool.lu/timestamp/

文件：frameworks/base/services/core/jni/com_android_server_AlarmManagerService.cpp

修改接口：android_server_AlarmManagerService_setKernelTime

系统时间限制默认是Int（有符号32位，最大0X7FFFFFFF）最大值即为： Integer.MAX_VALUE = 0X7FFFFFFF=2147483647 = 2038-01-19 11:14:07

将RTC时间限制改成自己所需时间：4102415940LL = 2099-12-31 23:59:00

static jint android_server_AlarmManagerService_setKernelTime(JNIEnv*, jobject, jlong nativeData, jlong millis)
{
    ALOGD("Setting setKernelTime\n");

    AlarmImpl *impl = reinterpret_cast<AlarmImpl *>(nativeData);
    struct timeval tv;
    int ret;

    if (millis <= 0 || millis / 1000LL > 4102415940LL) {
        return -1;
    }

    tv.tv_sec = (time_t) (millis / 1000LL);
    tv.tv_usec = (suseconds_t) ((millis % 1000LL) * 1000LL);

    ALOGD("Setting time of day to sec=%ld\n", (int) tv.tv_sec);

    ret = impl->setTime(&tv);

    if(ret < 0) {
        ALOGW("Unable to set rtc to %ld: %s\n", tv.tv_sec, strerror(errno));
        ret = -1;
    }
    return ret;
}

系统原生设置也限制了最大时间，所以原生设置也得改下（使用的是车载系统）
文件：/packages/apps/Car/Settings/src/com/android/car/settings/datetime/DatePickerFragment.java

private static final long MAX_TIME_SEC = 4102415940L;

public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        mDatePicker = (DatePicker) getView().findViewById(R.id.date_picker);

        Button button = (Button) getActivity().findViewById(R.id.action_button1);
        button.setText(android.R.string.ok);
        button.setOnClickListener(v -> {
            Calendar c = Calendar.getInstance();

            c.set(Calendar.YEAR, mDatePicker.getYear());
            c.set(Calendar.MONTH, mDatePicker.getMonth());
            c.set(Calendar.DAY_OF_MONTH, mDatePicker.getDayOfMonth());
            long when = Math.max(c.getTimeInMillis(), DatetimeSettingsFragment.MIN_DATE);
            Log.i("setting","setTime when:"+when);
            if (when / MILLIS_IN_SECOND <= MAX_TIME_SEC) {
                ((AlarmManager) getContext().getSystemService(Context.ALARM_SERVICE)).setTime(when);
                getContext().sendBroadcast(new Intent(Intent.ACTION_TIME_CHANGED));
            }
            getFragmentController().goBack();
        });
    }