From looking at the code, seems like it would be a pretty simple change to make the server accept several addresses, derived from the current time plus or minus

From looking at the code, seems like it would be a pretty simple change to make the server accept several addresses, derived from the current time plus or minus a small number of 30-second intervals. That allows you to tolerate a small amount of clock skew, and if your clock is off by more than a minute or two, you should probably fix it anyway.