A day was specified by the day, month and
season, say, day 4 of month 2 of Inundation.
The years were numbered by reign, say year 10 of Thutmose III. A working day
typically consisted of two four hour shifts with a lunch break at midday.
The Egyptian calendar did not take account of the extra quarter of a day in the solar year and thus it was a 'sliding' calendar which corrected itself every 1450 years.
The Julian calendar was used from 30 BC.