In the "Try Now" version:

You can log in as a employee or a manager. Creating and editing employees are disabled in the demo version.

The vacation days are cleared everyday at 00:00 GMT.

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This POC was designed to be used in a single year.

We are using a free API to retrieve the vacation days. This free API is limited to a previous year hence the use of the year 2021. 

For the purpose of the POC we opted to retrieve Portugal's bank holidays but of course this can be changed.