added some function for choose date

main.py

@@ -107,9 +107,40 @@ def list_projects():
     return projects
 
 
+@app.post("/preview-time")
+async def preview_time_from_csv(file: UploadFile = File(...)):
+    """
+    Parse a file and return the extracted work time without submitting.
+    """
+    content = await file.read()
+    filename = (file.filename or "").lower()
+    content_type = (file.content_type or "").lower()
+    
+    try:
+        if filename.endswith(".xlsx") or "spreadsheetml" in content_type:
+            rows = parse_xlsx(content)
+        else:
+            rows = parse_csv(content.decode('utf-8-sig'))
+    except ValueError as e:
+        raise HTTPException(status_code=400, detail=str(e))
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=f"Failed to parse file: {str(e)}")
+    
+    work_time = extract_work_time(rows)
+    
+    if not work_time:
+        raise HTTPException(
+            status_code=400,
+            detail="No valid work time found in the uploaded file."
+        )
+        
+    return [{"date": k, "hours": v} for k, v in sorted(work_time.items())]
+
+
 @app.post("/report-time", response_model=TimeReportResponse)
 async def report_time_from_csv(
     project_name: str,
+    excluded_dates: str = "",
     file: UploadFile = File(...)
 ):
     """
@@ -168,10 +199,14 @@ async def report_time_from_csv(
     
     work_time = extract_work_time(rows)
     
+    if excluded_dates:
+        excluded_list = [d.strip() for d in excluded_dates.split(",")]
+        work_time = {k: v for k, v in work_time.items() if k not in excluded_list}
+    
     if not work_time:
         raise HTTPException(
             status_code=400,
-            detail="No valid work time found in the uploaded CSV."
+            detail="No valid work time found in the uploaded CSV after filtering."
         )
     
     # Submit events