In the bottom right corner of a standard Android notification is time (eg 12:00). Can I hide it without using custom notification layout?
For API level 17 and onward, the above accepted answer by Erwan is correct.
It is possible to do that.
Try setting when to 0. For the few notifications that don't do that, it looks like thats what they do.
Here's the general API reference.
Here's a link to the ADB notification and search for private void updateAdbNotification()...