CC2340R5: How to get the system time of the phone after Bluetooth connection

Part Number: CC2340R5

Hi,

 I need to create a clock product. After the CC2340 connects with a smartphone, how can I get the system time of the phone. It’s not possible to send the time through an app, as we are not developing an app for the product. How can the CC2340 synchronize time with the system after connecting via Bluetooth?