I have Wifi router and server that a number of devices connect to on a ship. The devices are both mobile(iOS, Android) and laptops. Connections are so that the devices can only access a specific website on the server.
The location of the devices change but I need to allow manually be able to change the time zone of the devices so that we are all using the same time. In other words I want to be able to manually change the time zone on the router or server so that all the devices use the same time zone.
How do I ensure all the devices automatically update the time zone from my server or router?