If being exact to the extreme is your thing, you may look into either high-frequency quartz (these are exact to within seconds a year), or any bluetooth-adjuste

If being exact to the extreme is your thing, you may look into either high-frequency quartz (these are exact to within seconds a year), or any bluetooth-adjusted Casio (these will quietly sync with your phone several times a day, and your phone is synced to an atomic clock).