Function zero_clock

pub fn zero_clock() -> NTP64

A dummy clock that returns a NTP64 initialized with the value 0. Suitable to use in no_std environments where std::time::{SystemTime, UNIX_EPOCH} are not available. If the feature std is disabled, that’s the default clock used by an HLC if HLCBuilder::with_clock() is not called. Notice that this means that the HLC will use incremental timestamps starting from 0.