Blink without Delay +fmod +proteus

Groove:
Does your life stop working when your mantelpiece clock flips over at midnight?
At what point did time become a floating-point quantity?

Not understand what you mean. I tried with arduino Uno v3 and the result is: It blink 1s, turn off 1s, then 1s later LED is bright slightly, turn off 1(s) then is bright for 3s. Why??