Tell us about yourself!
are you using https://github.com/2dom/NtpClient ?
i dont know if it is "allowed" :-D, it tried that and it seems to do the trick very welleasier than changing colors
also found a brightness function:display.setBrightness(10); values between 0-255add before display.display(70) also works. maybe the better solution!? dont know
you can adjust the color values to lower values
Download https://github.com/PaulStoffregen/Time and copy to your Arduino Libraries