diff --git a/drees.py b/drees.py
index ca57d72..49879a6 100644
--- a/drees.py
+++ b/drees.py
@@ -499,13 +499,15 @@ def get_age_field_args() -> List[Tuple[AgeGroup, Field]]:
     return pool_args
 
 
-def generate_html_page() -> None:
+def generate_html_page(np_date: np.ndarray) -> None:
     logging.info("generating html page with plots...")
     os.makedirs(BUILD_REPOSITORY, exist_ok=True)
     env = Environment(
         loader=FileSystemLoader("templates"), autoescape=select_autoescape()
     )
     template = env.get_template("index.template.html")
+    date_start = np_date[0].astype(dt).strftime(DATE_FORMAT)
+    date_end = np_date[-1].astype(dt).strftime(DATE_FORMAT)
     data = template.render(
         **{
             "fields": Field,
@@ -513,6 +515,7 @@ def generate_html_page() -> None:
             "status": VacStatus,
             "static": os.path.join(MAIN_URL, STATIC_REPOSITORY),
             "src": DATA_URL,
+            "period": f"{date_start} -> {date_end}"
         }
     )
     with open(os.path.join(BUILD_REPOSITORY, "index.html"), "w") as f:
@@ -583,4 +586,4 @@ if __name__ == "__main__":
             plot_bar_age_percent_by_field(np_data, np_date, field)
 
     if args.to_html:
-        generate_html_page()
+        generate_html_page(np_date)
diff --git a/templates/index.template.html b/templates/index.template.html
index 52a2069..9ff363c 100644
--- a/templates/index.template.html
+++ b/templates/index.template.html
@@ -11,6 +11,7 @@
         <div class="main-container">
             <h1>Thegux covid-19</h1>
             <div>source : <a href="{{ src }}">Data DRESS</a></div>
+            <div>période temporelle : {{ period }}</div>
             <h3>Hospitalisations/Soins critiques/Décés par status vaccinal groupés par tranches d'âges</h3>
             {% for field in fields %}
                 <img src="{{ static }}/plots/age_percent_vac_{{ field.name.lower() }}.png"/>