The Egyptian year was divided into three seasons, Inundation, Emergence and Drought, each of four months.
Each month was 30 days (the symbol for month is the crescent moon). The year ended with 5 extra days that were celebrated as the birthdays of Osiris, Horus, Seth, Isis and Nephthys.

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.