diff --git a/app/components/time_series_component.rb b/app/components/time_series_component.rb
index 506aff55c..0d0549e43 100644
--- a/app/components/time_series_component.rb
+++ b/app/components/time_series_component.rb
@@ -58,7 +58,7 @@ class TimeSeriesComponent < ApplicationComponent
         containLabel: true
       },
       legend: {
-        data: y_axis.map(&:capitalize),
+        data: y_axis,
         type: "scroll",
         left: 0,
         padding: [8, 200, 0, 15],
@@ -87,7 +87,7 @@ class TimeSeriesComponent < ApplicationComponent
       yAxis: [type: "value"] * y_axis.size,
       series: y_axis.map do |name|
         {
-          name: name.capitalize,
+          name: name,
           type: "line",
           areaStyle: {},
           stack: "all",
@@ -109,7 +109,7 @@ class TimeSeriesComponent < ApplicationComponent
       yAxis: [type: "category", inverse: true] * y_axis.size,
       series: y_axis.map do |name|
         {
-          name: name.capitalize,
+          name: name,
           type: "bar",
           emphasis: {
             focus: "series"
diff --git a/app/components/time_series_component/time_series_component.html.erb b/app/components/time_series_component/time_series_component.html.erb
index 2bd2b2a23..f75729166 100644
--- a/app/components/time_series_component/time_series_component.html.erb
+++ b/app/components/time_series_component/time_series_component.html.erb
@@ -21,7 +21,7 @@
   <table class="striped autofit" width="100%">
     <thead>
       <% dataframe.types.keys.each do |column| %>
-        <%= tag.th(column.to_s.titleize, class: ("col-expand" if column == dataframe.types.keys.last)) %>
+        <%= tag.th(column == "date" ? "Date" : column.to_s, class: ("col-expand" if column == dataframe.types.keys.last)) %>
       <% end %>
     </thead>