Network clients time not updating
The most accurate time source on a network (such as a hardware clock) occupies the lowest stratum level, or stratum one.This accurate time source is called a reference clock.
Resources that acquire time from the NTP server are two steps away from the reference clock, and therefore occupy a stratum that is two higher than the most accurate time source, and so on.
As a computer's stratum number increases, the time on its system clock may become less accurate.
Therefore, the stratum level of any computer is an indicator of how closely that computer is synchronized with the most accurate time source.
When the W32Time Manager receives time samples, it uses special algorithms in NTP to determine which of the time samples is the most appropriate for use.
The time service also uses another set of algorithms to determine which of the configured time sources is the most accurate.