We currently use Visual Studio Team Services for our source control. Unfortunately, we do not use the project planning capabilities with VS team services. Meaning when we check-in code we do not map the source code to work items in a sprint.
Is it possible to query line of code changes for specific dates and certain application/solution from VS Team Services?
Both Git and TFVC have this information available, by linking your Visual Studio Team Services account to Power BI. The Git Activity and TFVC Activity reports provide a starting point, though for now the period you can report on is limited.