By law, if a day or part-day is substituted for any public holiday, then the substituted day or part-day is the public holiday.
An employment award/agreement may include provisions for an employer and employee to agree to substitute the days or part-days for another day or part-day. Furthermore, an employer and an award/agreement-free employee may agree to substitute the days or part days for another.
An employer must not exert undue influence or pressure on an employee in relation to agreeing to substitute a public holiday for another day or part-day.