refactor: update simulation duration calculation and set offset to zero in router request

src/aeros_simulation/router.py

@@ -527,23 +527,18 @@ async def get_forecast_eaf(
     except Exception:
         oh_date = datetime(now.year, 1, 1).replace(tzinfo=None)
 
-    # 3. Calculate Age in Hours (Offset)
-    offset_hours = hours_between(oh_date, now)
-
-    # 4. Define Forecast Window
     duration = 168 if time_range == "weekly" else 720
-    
-    start_date = oh_date
     end_date = now + timedelta(hours=duration)
+    duration_simulation = hours_between(oh_date, end_date)
     project = await get_project(db_session=db_session)
 
     # 5. Create Simulation Request
     sim_in = SimulationInput(
         SchematicName="- TJB - Unit 3 -",
         SimulationName=f"Simulation_{time_range}_{now.strftime('%Y%m%d')}",
-        SimDuration=duration,
+        SimDuration=duration_simulation,
         DurationUnit="UHour",
-        OffSet=offset_hours,
+        OffSet=0,
         SimSeed=1,
         SimNumRun=1,
         IsDefault=False