These op amp circuits shown above still saturate to a couple volts below 15V and a few mV above 0V(741 is not R-2-R)
but I wonder...
Are you using the analog output voltage to drive something else?
If you really need your zero detect signal to end up in a digital part, use a comparator for this. Running the opamps in saturation is not a good practice. You can use the same divider scheme shown by the others but add some hysteresis and the output can be pulled up (O/C type) right to the digital supply. Only use the opamp if you intend to wrap more circuits around the thing that will keep the amp in linear range.
Since comparators are designed for saturated operation, you'll get a much faster and more acurate zero-detect response out of it. Op amps can take a "long" time to come out of saturation.
Just my opinion!