Why are people using HTTPS for time? That would be quite the anti-pattern. Standard NTPD port 123 UDP works fine for most people and using Chrony [1][2] one can get down to double digit microseconds or even nanoseconds offset depending on their location. If people need lower than that they should be using their own GPS receivers and local stratum-1 servers in each datacenter and then using Chrony with a short poll interval within the datacenter to the edge stratum-1 servers.