HTTP Request Error 500

Hi Thomas,

Is 3.datetime already a date type variable? Also, what does the +2 at the end of the formula signify?

Could you please consult the API documentation to determine the expected format for the start and end times?

Thanks!

Could you please provide the start time and end time as a timestamp?

Kindly test this and inform us.

Best regards,
Digipanda Consulting Pvt. Ltd

Thanks! It was the +2 that caused the issue. I initially thought it was necessary due to the timezone.

However, in my subsequent HTTP request within the same workflow, I'm sending this:

https://api.cal.com/v2/calendars/busy-times?loggedInUsersTz=Europe%2FCopenhagen&calendarsToLoad [0][credentialId]=2794160&calendarsToLoad[0]

And I'm receiving this error:

Error: 400 Bad Request

• {"status":"error","timestamp":"2025-07-09T10:01:21.259Z","path":"/v2/calendars/busy-times?loggedInUsersTz=Europe%2FCopenhagen&amp;calendarsToLoad%5B0%5D%5BcredentialId%5D=2794160&amp;calendarsToLoad%5B1%5D=&amp;dateFrom=2025-07-11&amp;dateTo=2025-07-12","error":{"code":"BadRequestException","message":"Bad Request Exception","details":{"errors":[{"target":{"loggedInUsersTz":"Europe/Copenhagen","calendarsToLoad":[{"credentialId":2794160},""],"dateFrom":"2025-07-11","dateTo":"2025-07-12"},"value":[{"credentialId":2794160},""],"property":"calendarsToLoad","children":[{"target":[{"credentialId":2794160},""],"value":{"credentialId":2794160},"property":"0","children":[{"target":{"credentialId":2794160},"property":"externalId","children":<span class="chcklst-box fa fa-square-o fa-fw"></span>,"constraints":{"isString":"externalId must be a string"}}]},{"target":[{"credentialId":2794160},""],"value":"","property":"1","children":<span class="chcklst-box fa fa-square-o fa-fw"></span>,"constraints":{"nestedValidation":"each value in nested property calendarsToLoad must be either object or array"}}}]}}}]}}

I've figured everything out. Thanks to everyone!