I have a digital clock that I received from my mom just before she passed. It uses WWV for time/date sync. It has never drifted off time. If they shut down those stations, I will have to create my own NTP to shortwave low powered SDR unlicensed transmitter.

Does anyone already happen to have any code that will use system time to generate the audio signals and time code that would replicate WWV?

Edit: I think I found two [1] [2]

[1] - https://github.com/ka9q/WWV

[2] - https://github.com/micooke/wwvb_jjy