Did you mean an analog quartz watch? A date function there shouldn't have a huge impact in battery life, though if you don't want the date, you may as well cons

Did you mean an analog quartz watch? A date function there shouldn't have a huge impact in battery life, though if you don't want the date, you may as well conserve. But on a mechanical watch, many common movements have a calendar wheel which is powered by the gear train, it doesn't use a disproportionate amount of energy from the mainspring (compared to moving the hands).