diff --git a/CHANGELOG.md b/CHANGELOG.md
index 20746caa6..d9b984c1a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   [#410](https://github.com/greenbone/gvm-libs/pull/410)
 - Add multiple severities for nvti [#317](https://github.com/greenbone/gvm-libs/pull/317)
 - Add support for new OSP element for defining alive test methods via separate subelements. [#409](https://github.com/greenbone/gvm-libs/pull/409)
+- Add severity_date tag in epoch time format. [#412](https://github.com/greenbone/gvm-libs/pull/412)
 
 ### Changed
 - Add separators for a new (ip address) field in ERRMSG and DEADHOST messages. [#376](https://github.com/greenbone/gvm-libs/pull/376)
diff --git a/base/nvti.c b/base/nvti.c
index 9809e0a1b..65acb7e79 100644
--- a/base/nvti.c
+++ b/base/nvti.c
@@ -1458,10 +1458,10 @@ nvti_set_solution_method (nvti_t *n, const gchar *solution_method)
 
 /**
  * @brief Add a tag to the NVT tags.
- *        The tag names "last_modification" and "creation_date" are
- *        treated special: The value is expected to be a timestamp
- *        and it is being converted to seconds since epoch before
- *        added as a tag value.
+ *        The tag names "severity_date", "last_modification" and
+ *        "creation_date" are treated special: The value is expected
+ *        to be a timestamp  and it is being converted to seconds
+ *        since epoch before added as a tag value.
  *        The tag name "cvss_base" will be ignored and not added.
  *
  * @param n     The NVT Info structure.
@@ -1496,6 +1496,8 @@ nvti_add_tag (nvti_t *n, const gchar *name, const gchar *value)
       nvti_set_creation_time (n, parse_nvt_timestamp (value));
       newvalue = g_strdup_printf ("%i", (int) nvti_creation_time (n));
     }
+  else if (!strcmp (name, "severity_date"))
+    newvalue = g_strdup_printf ("%i", (int) parse_nvt_timestamp (value));
   else if (!strcmp (name, "cvss_base"))
     {
       /* Ignore this tag because it is not being used.