Second Viz

app.py

@@ -22,13 +22,13 @@ st.altair_chart(viz1, use_container_width=False)
 
 st.header("Visualization 2: Issued Time")
 data["Original Issue Date"] = pd.to_datetime(data["Original Issue Date"], errors="coerce")
-data["YearMonth"] = data["Original Issue Date"].dt.to_period("YM")
+# data["YearMonth"] = data["Original Issue Date"].dt.to_period("YM")
 
 viz2 = (
     alt.Chart(data)
     .mark_line(point=True)
     .encode(
-        x=alt.X("yearmonth(YearMonth):T", title = "Issue Date(Month)"),
+        x=alt.X("yearmonth(Original Issue Date):T", title = "Issue Date(Year Month)"),
         y = alt.Y("count():Q", title="Number of License"),
         color = alt.Color("License Type:N", legend=None)
     )