Time Synchronization

Hi I am using three LoRa E32 modules connected to three Arduino Uno modules but in this wireless network I need time synchronization of all the three nodes. Any suggestions how I can synchronize them???
Thanks

how accurate do they need to be?

Put an RTC on all of them.

Hello arxl,

Welcome.

Designate one as the master. Send a data packet from the master to the others every second containing a time stamp.