### Steps to reproduce

Begin of the deletion _Please write down the steps to reproduce. Try to write down all necessary preconditions (what permissions do you have, are other users involved?)._

End of the deletion 1. Login as a Begin of the insertionuser

End of the insertion Begin of the deletion user 
End of the deletion 2. Go to Time and Costs Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion 3. Set up a report so you have data including the column "Date (spent)" Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion 4. Click Export XLS Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion 5. Open the XLS and see the date cannot be formatted as a Date field in Begin of the insertionExcel. 

End of the insertion Begin of the deletion Excel. 
End of the deletion I see there is a superfluous ' at the beginning of the date field that would prevent Excel from identifying it as a Date. Begin of the insertion


End of the insertion Begin of the deletion

End of the deletion ### Begin of the deletion

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###End of the deletion Environment information

Begin of the deletion _Please check and fill out the following details to help us identify in what versions and distributions of OpenProject the error occurs_

End of the deletion **OpenProject installation type**

* [ ] Hosted cloud edition
* [ ] Packaged installation
* What distribution? Begin of the insertion

End of the insertion Begin of the deletion
End of the deletion * [ ] Docker All-in-one container
* [ ] Docker-compose installation
* [x] Begin of the insertionOther:End of the insertion Begin of the deletion Other (please specify) -End of the deletion My own Community edition version

**OpenProject version**

_If you're not running on the cloud edition, please specify the version of OpenProject you're running. Example: v12.1.4_

**Browser**

* [x] Chrome
* [x] Firefox
* [ ] Safari
* [ ] Mobile Safari
* [ ] Other (please specify)

**Language**

English