The setting for Tidal Chronoscope is automatically set for your location utilizing the GPS function of your mobile device and your current location. But if you wish to set for future predicated time or date, you can make the adjustments as follows:
Slide crown out for manually setting time/tide
Slide crown upward or downward to set time/date for future tide/moon prediction
Tap and time/date wheel appears. Adjust for future date/time for future tide/moon prediction