The statue of The Baby Princess with the Pedestal and the date of birth and death… the same.
The dating system in Equestria is measured by important dates, and divided into eras, but for dates of death/birth, the Equestrian Calendar is officially 'AF' for the first 7,000 years (After Founding) and started the year Equestria was founded, and only changed around 1000 years ago to 'AB' or 'After Banishment', marking Luna's banishment (this change was made so Celestia could cleanly count down the years to her sister's return) and has not changed since. Like ours, the system has an alternate name for them; 'DE' for Diarchic Era and 'CE' for Celestial Era, but Celestia doesn't approve of this one.