在设置AlarmManager的时候，可以通过使用UTC时间来避免时区或夏令时导致的问题。

示例代码：

// 获取UTC时间
Calendar cal = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
cal.setTimeInMillis(System.currentTimeMillis());

// 设置AlarmManager，每天早上8点触发
AlarmManager alarmMgr = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmReceiver.class);
PendingIntent alarmIntent = PendingIntent.getBroadcast(context, 0, intent, 0);
cal.set(Calendar.HOUR_OF_DAY, 8);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
alarmMgr.setRepeating(AlarmManager.RTC_WAKEUP, cal.getTimeInMillis(), AlarmManager.INTERVAL_DAY, alarmIntent);