Modern Solution

This app serves a single purpose: to display a notification with the current date and time as efficiently as possible. The goal is to work around several issues in Android 12 as experienced on a Pixel device at the start of November 2021:
- Lockscreen clock looks nicer if there is a notification.
- Current time is not visible when viewing notifications.
- Current date sometimes not visible on lockscreen.
- No AM/PM with status bar clock for 12-hour format.

Notes about efficiency trade-offs:
- Notifications use chronometer mode to display an elapsed time. This allows the app to be active only 2-3 times a day instead of every minute.
- Due to chronometer: No AM/PM label for 12-hour format. Try AM/PM icon style.
- Due to chronometer: No leading zeros visible for 24-hour format. Times like 01:23:45 are displayed like 1:23:45. Times like 00:12:34 are displayed like 24:12:34 (instead of 12:34).