What is the Certified Pool/Spa OperatorÂ® Certification Program? A CPOÂ® Certification provides individuals with the basic knowledge, techniques, and skills of pool and spa operations. This training has helped protect millions of swimmers by reducing hazards at aquatic facilities.
A year is the orbital period of the Earth moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by changes in weather, the hours of daylight, and, consequently, vegetation and soil fertility.
Year(Now()) calculates the year number from the current year. Year([DoB]) calculates the year number from the date it finds in the [DoB] field. The expression subtracts the person's birth year from the current year to give an approximate age, but does not take account of whether or not thy have had their birthday.