diff --git a/packages/hurl/src/http/certificate.rs b/packages/hurl/src/http/certificate.rs
index b487f51aaf..fd98900094 100644
--- a/packages/hurl/src/http/certificate.rs
+++ b/packages/hurl/src/http/certificate.rs
@@ -29,7 +29,7 @@ use super::easy_ext::CertInfo;
 pub struct Certificate {
     subject: Option<String>,
     issuer: Option<String>,
-    pub start_date: DateTime<Utc>,
+    pub start_date: Option<DateTime<Utc>>,
     pub expire_date: DateTime<Utc>,
     pub serial_number: String,
     pub subject_alt_name: Option<String>,
@@ -40,7 +40,7 @@ impl Certificate {
     pub fn new(
         subject: Option<String>,
         issuer: Option<String>,
-        start_date: DateTime<Utc>,
+        start_date: Option<DateTime<Utc>>,
         expire_date: DateTime<Utc>,
         serial_number: String,
         subject_alt_name: Option<String>,
@@ -75,7 +75,7 @@ impl TryFrom<CertInfo> for Certificate {
         let attributes = parse_attributes(&cert_info.data);
         let subject = parse_subject(&attributes).ok();
         let issuer = parse_issuer(&attributes).ok();
-        let start_date = parse_start_date(&attributes)?;
+        let start_date = parse_start_date(&attributes).ok();
         let expire_date = parse_expire_date(&attributes)?;
         let serial_number = parse_serial_number(&attributes)?;
         let subject_alt_name = parse_subject_alt_name(&attributes).ok();
@@ -225,7 +225,7 @@ mod tests {
         );
         assert_eq!(
             parse_start_date(&attributes).unwrap(),
-            chrono::DateTime::parse_from_rfc2822("Tue, 10 Jan 2023 08:29:52 GMT")
+            DateTime::parse_from_rfc2822("Tue, 10 Jan 2023 08:29:52 GMT")
                 .unwrap()
                 .with_timezone(&Utc)
         );
@@ -237,7 +237,7 @@ mod tests {
         );
         assert_eq!(
             parse_start_date(&attributes).unwrap(),
-            chrono::DateTime::parse_from_rfc2822("Tue, 10 Jan 2023 08:29:52 GMT")
+            DateTime::parse_from_rfc2822("Tue, 10 Jan 2023 08:29:52 GMT")
                 .unwrap()
                 .with_timezone(&Utc)
         );
@@ -300,10 +300,10 @@ mod tests {
                 subject: Some("C = US, ST = Denial, L = Springfield, O = Dis, CN = localhost"
                     .to_string()),
                 issuer: Some("C = US, ST = Denial, L = Springfield, O = Dis, CN = localhost".to_string()),
-                start_date: chrono::DateTime::parse_from_rfc2822("Tue, 10 Jan 2023 08:29:52 GMT")
+                start_date: Some(DateTime::parse_from_rfc2822("Tue, 10 Jan 2023 08:29:52 GMT")
                     .unwrap()
-                    .with_timezone(&Utc),
-                expire_date: chrono::DateTime::parse_from_rfc2822("Thu, 30 Oct 2025 08:29:52 GMT")
+                    .with_timezone(&Utc)),
+                expire_date: DateTime::parse_from_rfc2822("Thu, 30 Oct 2025 08:29:52 GMT")
                     .unwrap()
                     .with_timezone(&Utc),
                 serial_number: "1e:e8:b1:7f:1b:64:d8:d6:b3:de:87:01:03:d2:a4:f5:33:53:5a:b0"
@@ -315,7 +315,7 @@ mod tests {
             Certificate::try_from(CertInfo { data: vec![] })
                 .err()
                 .unwrap(),
-            "missing start date attribute in {}".to_string()
+            "missing expire date attribute".to_string()
         );
     }
 }
diff --git a/packages/hurl/src/json/result.rs b/packages/hurl/src/json/result.rs
index 4a380ccbec..c77410ec6c 100644
--- a/packages/hurl/src/json/result.rs
+++ b/packages/hurl/src/json/result.rs
@@ -193,7 +193,8 @@ struct CertificateJson {
     subject: Option<String>,
     #[serde(skip_serializing_if = "Option::is_none")]
     issuer: Option<String>,
-    start_date: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    start_date: Option<String>,
     expire_date: String,
     serial_number: String,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -449,7 +450,7 @@ impl CertificateJson {
         CertificateJson {
             subject: c.subject().cloned(),
             issuer: c.issuer().cloned(),
-            start_date: c.start_date.to_string(),
+            start_date: c.start_date.map(|d| d.to_string()),
             expire_date: c.expire_date.to_string(),
             serial_number: c.serial_number.to_string(),
             subject_alt_name: c.subject_alt_name.clone(),
diff --git a/packages/hurl/src/report/html/run.rs b/packages/hurl/src/report/html/run.rs
index 92e28a8b65..6c63247f0a 100644
--- a/packages/hurl/src/report/html/run.rs
+++ b/packages/hurl/src/report/html/run.rs
@@ -131,7 +131,6 @@ fn get_call_html(
 
     // Certificate
     if let Some(certificate) = &call.response.certificate {
-        let start_date = certificate.start_date.to_string();
         let end_date = certificate.expire_date.to_string();
         let mut values = vec![];
 
@@ -141,7 +140,10 @@ fn get_call_html(
         if let Some(issuer) = certificate.issuer() {
             values.push(("Issuer", issuer.as_str()));
         }
-        values.push(("Start Date", start_date.as_str()));
+        let start_date = certificate.start_date.map(|d| d.to_string());
+        if let Some(start_date) = start_date.as_ref() {
+            values.push(("Start Date", start_date.as_str()));
+        }
         values.push(("Expire Date", end_date.as_str()));
         values.push(("Serial Number", certificate.serial_number.as_str()));
         if let Some(subject_alt_name) = certificate.subject_alt_name.as_ref() {
diff --git a/packages/hurl/src/runner/query.rs b/packages/hurl/src/runner/query.rs
index b51fbc1c9f..fdaa0f9958 100644
--- a/packages/hurl/src/runner/query.rs
+++ b/packages/hurl/src/runner/query.rs
@@ -392,7 +392,10 @@ fn eval_query_certificate(
                 Some(issuer) => Value::String(issuer.clone()),
                 None => return Ok(None),
             },
-            CertificateAttributeName::StartDate => Value::Date(certificate.start_date),
+            CertificateAttributeName::StartDate => match certificate.start_date.as_ref() {
+                Some(date) => Value::Date(*date),
+                None => return Ok(None),
+            },
             CertificateAttributeName::ExpireDate => Value::Date(certificate.expire_date),
             CertificateAttributeName::SerialNumber => {
                 Value::String(certificate.serial_number.clone())