The Year / Date of Birth field in the Participants window can be used to input a year of birth, a date of birth, or even an age if you activate the option Suppose input is age, if year of birth <100 under Main Window > Participants > General.

If you type or import a year of birth only, the date of birth will be set to January 1st in that year. If you type or import an age, the year of birth will be calculated based on the event date, and the date of birth will be set to the event day.

When importing via Excel, make sure to have only one field in your file with an indication of age, date, or year of birth.

DateOfBirth will be formatted according to the event date format. If you would like to show it in a different format, use the date() function.