The date of the tournament, if one day, in ISO format (yyyy-mm-dd). Do not use this for multi-day tournaments, use 'start date' and 'end date' instead.
start date
The start of a multi-day tournament, in ISO format (yyyy-mm-dd). Do not use this for one day tournaments, use 'date' instead.
end date
The end of a multi-day tournament, in ISO format (yyyy-mm-dd). Do not use this for one day tournaments, use 'date' instead.