You have received a task for Employee's leave Approval. But, the date format you have received in subject of the task does not match with your system's date format. Example : The date format you are using is 01/01/2020. In the Approval task, the date format is 01-01-2020.
SAP Business ByDesign
This is a standard system behaviour. The Date format in the Subject text of the task is derived from the Sender Employee's Date Format.
Altering the subject text of the task to match the approver's Date Format Settings, would require some development. This is something that would be considered an improvement topic.
Approval, Leave Approval, Date format, Approver , KBA , SRD-HR-TLM , Time and Labour Management , Problem