Omega Seamaster Planet Ocean watch. Date doesn't change, even with the time passing midnight

SOURCE: Hi, my omega seamaster planet ocean has stopped.

Hi Rob, Don't worry if it's a genuine Omega and hasn't been subjected to serious abuse then whatever the problem may be it won't be terminal. All mechanical watches, particularly high quality watches such as this should be serviced every two to three years and in this case ONLY by a qualified Omega service person. Cause may be a simple as lubrication however the low fiction properties of these watches are fundamental to their revolutionary design. It may have become magnetised, or any number of things may have occurred to have caused it to stop. If you cannot wind it via the crown then the mainspring is wound by movement. Try shaking it for 15 to 20mins and if it doesn't restart take it to an authorised Omega repair service. Jo

SOURCE: Changing the Bezel on an Omega Seamaster Planet ocean

I would strongly suggest taking it to an approved Omega dealer so it can be repaired by Omega themselves. This retains your guarantee, reseals the watch and protects your investment in a *fabulous* watch. I have the same watch and I love it. The aftersales care is excellent. You should be well looked after.

SOURCE: my omega seamaster professional planet

As I can see,this is an Automatic Omega watch.The most possible cause is that the watch is out of power.
Ensure the watch in your palm by passing four fingers throught closed strap and moving it up and down,making a trajectory of about 60 degrees, many times not too fast,not too slow.Try many times.If problem persists,my advice is to take it to an Authorised Omega Service Centre (as it is an expensive watch) for secure service and repair if needed.