data seed fix

src/components/Gantt/gantt-content.tsx

@@ -91,10 +91,8 @@ export const GanttContent: React.FC<GanttContentProps> = ({
       dates[1].getTimezoneOffset() * 60 * 1000 +
       dates[0].getTimezoneOffset() * 60 * 1000;
     const newXStep = (timeStep * columnWidth) / dateDelta;
-    if (newXStep !== xStep) {
-      setXStep(newXStep);
-    }
-  }, [columnWidth, dates, timeStep, xStep]);
+    setXStep(newXStep);
+  }, [columnWidth, dates, timeStep]);
 
   // generate tasks
   useEffect(() => {

src/helpers/date-helper.ts

@@ -67,6 +67,7 @@ export const ganttDateRange = (tasks: Task[], viewMode: ViewMode) => {
   switch (viewMode) {
     case ViewMode.Month:
       newStartDate = addToDate(newStartDate, -1, "month");
+      newStartDate = startOfDate(newStartDate, "month");
       newEndDate = addToDate(newEndDate, 1, "year");
       newEndDate = startOfDate(newEndDate, "year");
       break;