Waking up at night, looking for the time, and being flash-blinded by the phone screen?

Turn an old AMOLED phone into a night clock, with eyes-saving features.
Screen brightness is reduced to minimum to prevent eyes strain in complete darkness and the default clock color is red, to keep pupils from contracting.

Note: this is not an alarm watch: you can continue to use the system clock, on the same phone, for that.