cnngimenezDiary type timestamps are very useful to describe holydays in #OrgMode. Org Mode supports diary, monthly, or anual periodicity with <2025-06-18 +1d>, <2025-06-18 +1m>, <2025-06-18 +1y> respectively.
But there is no syntax for more complex periodicity such as "the 3rd saturday of september". For that cases use the diary syntax. For example:
```
* Software Freedom Day
<%%(diary-float 9 6 3)>
```