IEEE 1344 is a standard that defines parameters for synchrophasors[1] for power systems.
Every tenth bit is a "position identifier", and most of the remainder encode the current time (date, hour, minute and second).
The standard also calls for indicating 2 digits of year in bits 50–58, which has been incorporated into the IRIG since 2004.
Instead of being based on IRIG and binary-coded decimals, the new standard uses a section format using ordinary binary integers.
It also comes with a separate part to deal with matters such as synchophasor performance and frequency of measurement.