Notion doesn't have an option to setup date when task is completed. So aim of the repository is setting "Completed At" property to have visibility of how many tasks were completed and when.
"Modified At" property is used to setup Completed Date. All the tasks that modified today, have "Completed" status and empty "Completed At" property will get assigned "Modified At" value to the "Completed At" property.
In case, you have many old tasks, it is still possible to initialize "Completed At" field. To initialize it, you need to specify startDate and endDate in completeOldTasks.js and run it node completeOldTasks.js
Alternatively, you can fork the repository and manually run github actions. Before the run you will be able to specify start date and end date which should be completed.
