Does anyone know what resolution of frequency data I'd need to be recording to be able to date a recording myself? After reading this, I remembered that I have

Does anyone know what resolution of frequency data I'd need to be recording to be able to date a recording myself? After reading this, I remembered that I have an IoTaWatt throwing mains voltage and frequency into Influx every second or so, but I've got no idea if this would be high enough resolution to match against a recording (or even how one would go about doing it).