diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9852f9352..9580fc174 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # WeeChat ChangeLog
 
+## Version 4.6.4 (under dev)
+
+### Added
+
+- core: add support of specifier `%@` for UTC time in function util_strftimeval
+
 ## Version 4.6.3 (2025-05-11)
 
 ### Fixed
diff --git a/doc/en/weechat_plugin_api.en.adoc b/doc/en/weechat_plugin_api.en.adoc
index dee34c980..01532a241 100644
--- a/doc/en/weechat_plugin_api.en.adoc
+++ b/doc/en/weechat_plugin_api.en.adoc
@@ -4762,7 +4762,7 @@ This function is not available in scripting API.
 
 ==== util_strftimeval
 
-_WeeChat ≥ 4.2.0, updated in 4.3.0._
+_WeeChat ≥ 4.2.0, updated in 4.3.0, 4.6.4._
 
 Format date and time like function `strftime` in C library, using `struct timeval`
 as input, and supporting extra specifiers.
@@ -4779,6 +4779,8 @@ Arguments:
 * _string_: buffer where the formatted string is stored
 * _max_: string size
 * _format_: format, the same as _strftime_ function, with these extra specifiers:
+** `%@`: return the date expressed in Coordinated Universal Time (UTC)
+   instead of date relative to the user's specified timezone _(WeeChat ≥ 4.7.0)_
 ** `%.N` where `N` is between 1 and 6: zero-padded microseconds on N digits
    (for example `%.3` for milliseconds)
 ** `%f`: alias of `%.6`
@@ -4795,8 +4797,8 @@ C example:
 char time[256];
 struct timeval tv;
 gettimeofday (&tv, NULL);
-weechat_util_strftimeval (time, sizeof (time), "%FT%T.%f", &tv);
-/* result: 2023-12-26T18:10:04.460509 */
+weechat_util_strftimeval (time, sizeof (time), "%@%FT%T.%fZ", &tv);
+/* result: 2023-12-26T18:10:04.460509Z */
 ----
 
 [NOTE]
diff --git a/doc/fr/weechat_plugin_api.fr.adoc b/doc/fr/weechat_plugin_api.fr.adoc
index 7a2dbcb3a..b76e50622 100644
--- a/doc/fr/weechat_plugin_api.fr.adoc
+++ b/doc/fr/weechat_plugin_api.fr.adoc
@@ -4841,7 +4841,7 @@ Cette fonction n'est pas disponible dans l'API script.
 
 ==== util_strftimeval
 
-_WeeChat ≥ 4.2.0, mis à jour dans la 4.3.0._
+_WeeChat ≥ 4.2.0, mis à jour dans la 4.3.0, 4.6.4._
 
 Formatter la date et l'heure comme la fonction `strftime` de la bibliothèque C,
 en utilisant un `struct timeval` en entrée et en supportant des caractères de
@@ -4860,6 +4860,8 @@ Paramètres :
 * _max_ : taille de la chaîne
 * _format_ : format, le même que celui de la fonction _strftime_, avec des
   caractères de conversion supplémentaires :
+** `%@` : retourner la date exprimée en Temps Universel Coordonné (UTC)
+   au lieu de la date relative au fuseau horaire de l'utilisateur _(WeeChat ≥ 4.7.0)_
 ** `%.N` où `N` est entre 1 and 6: microsecondes remplies avec des zéros sur
    N chiffres (par exemple `%.3` pour les millisecondes)
 ** `%f` : alias de `%.6`
@@ -4876,8 +4878,8 @@ Exemple en C :
 char time[256];
 struct timeval tv;
 gettimeofday (&tv, NULL);
-weechat_util_strftimeval (time, sizeof (time), "%FT%T.%f", &tv);
-/* résultat : 2023-12-26T18:10:04.460509 */
+weechat_util_strftimeval (time, sizeof (time), "%@%FT%T.%fZ", &tv);
+/* résultat : 2023-12-26T18:10:04.460509Z */
 ----
 
 [NOTE]
diff --git a/doc/it/weechat_plugin_api.it.adoc b/doc/it/weechat_plugin_api.it.adoc
index 929b2577e..4fb7db5a1 100644
--- a/doc/it/weechat_plugin_api.it.adoc
+++ b/doc/it/weechat_plugin_api.it.adoc
@@ -4985,7 +4985,7 @@ Questa funzione non è disponibile nelle API per lo scripting.
 // TRANSLATION MISSING
 ==== util_strftimeval
 
-_WeeChat ≥ 4.2.0, updated in 4.3.0._
+_WeeChat ≥ 4.2.0, updated in 4.3.0, 4.6.4._
 
 Format date and time like function `strftime` in C library, using `struct timeval`
 as input, and supporting extra specifiers.
@@ -5002,6 +5002,8 @@ Arguments:
 * _string_: buffer where the formatted string is stored
 * _max_: string size
 * _format_: format, the same as _strftime_ function, with these extra specifiers:
+** `%@`: return the date expressed in Coordinated Universal Time (UTC)
+   instead of date relative to the user's specified timezone _(WeeChat ≥ 4.7.0)_
 ** `%.N` where `N` is between 1 and 6: zero-padded microseconds on N digits
    (for example `%.3` for milliseconds)
 ** `%f`: alias of `%.6`
@@ -5018,8 +5020,8 @@ C example:
 char time[256];
 struct timeval tv;
 gettimeofday (&tv, NULL);
-weechat_util_strftimeval (time, sizeof (time), "%FT%T.%f", &tv);
-/* result: 2023-12-26T18:10:04.460509 */
+weechat_util_strftimeval (time, sizeof (time), "%@%FT%T.%fZ", &tv);
+/* result: 2023-12-26T18:10:04.460509Z */
 ----
 
 [NOTE]
diff --git a/doc/ja/weechat_plugin_api.ja.adoc b/doc/ja/weechat_plugin_api.ja.adoc
index 0c7385589..db6504cff 100644
--- a/doc/ja/weechat_plugin_api.ja.adoc
+++ b/doc/ja/weechat_plugin_api.ja.adoc
@@ -4898,7 +4898,7 @@ weechat_printf (NULL, "date: %s",
 // TRANSLATION MISSING
 ==== util_strftimeval
 
-_WeeChat ≥ 4.2.0, updated in 4.3.0._
+_WeeChat ≥ 4.2.0, updated in 4.3.0, 4.6.4._
 
 Format date and time like function `strftime` in C library, using `struct timeval`
 as input, and supporting extra specifiers.
@@ -4915,6 +4915,8 @@ Arguments:
 * _string_: buffer where the formatted string is stored
 * _max_: string size
 * _format_: format, the same as _strftime_ function, with these extra specifiers:
+** `%@`: return the date expressed in Coordinated Universal Time (UTC)
+   instead of date relative to the user's specified timezone _(WeeChat ≥ 4.7.0)_
 ** `%.N` where `N` is between 1 and 6: zero-padded microseconds on N digits
    (for example `%.3` for milliseconds)
 ** `%f`: alias of `%.6`
@@ -4931,8 +4933,8 @@ C example:
 char time[256];
 struct timeval tv;
 gettimeofday (&tv, NULL);
-weechat_util_strftimeval (time, sizeof (time), "%FT%T.%f", &tv);
-/* result: 2023-12-26T18:10:04.460509 */
+weechat_util_strftimeval (time, sizeof (time), "%@%FT%T.%fZ", &tv);
+/* result: 2023-12-26T18:10:04.460509Z */
 ----
 
 [NOTE]
diff --git a/doc/sr/weechat_plugin_api.sr.adoc b/doc/sr/weechat_plugin_api.sr.adoc
index acc531e82..59f16f448 100644
--- a/doc/sr/weechat_plugin_api.sr.adoc
+++ b/doc/sr/weechat_plugin_api.sr.adoc
@@ -4624,7 +4624,7 @@ weechat_printf (NULL, "date: %s",
 
 ==== util_strftimeval
 
-_WeeChat ≥ 4.2.0, ажурирано у 4.3.0._
+_WeeChat ≥ 4.2.0, ажурирано у 4.3.0, 4.6.4._
 
 Форматира датум и време као функција `strftime` из C библиотеке, користећи `struct timeval`
 као улаз уз подршку за додатне спецификаторе.
@@ -4641,6 +4641,9 @@ int weechat_util_strftimeval (char *string, int max, const char *format, struct
 * _string_: бафер у који се смешта форматирани стринг
 * _max_: величина стринга
 * _format_: формат, исто као за _strftime_ функцију, са следећим додатним спецификаторима:
+// TRANSLATION MISSING
+** `%@`: return the date expressed in Coordinated Universal Time (UTC)
+   instead of date relative to the user's specified timezone _(WeeChat ≥ 4.7.0)_
 ** `%.N` где је `N` између 1 и 6: микросекунде допуњене нулама на N цифара
    (на пример `%.3` за милисекунде)
 ** `%f`: алијас за `%.6`
@@ -4657,8 +4660,8 @@ C пример:
 char time[256];
 struct timeval tv;
 gettimeofday (&tv, NULL);
-weechat_util_strftimeval (time, sizeof (time), "%FT%T.%f", &tv);
-/* резултат: 2023-12-26T18:10:04.460509 */
+weechat_util_strftimeval (time, sizeof (time), "%@%FT%T.%fZ", &tv);
+/* резултат: 2023-12-26T18:10:04.460509Z */
 ----
 
 [NOTE]
diff --git a/src/core/core-util.c b/src/core/core-util.c
index 9cac5ee47..dda9fc778 100644
--- a/src/core/core-util.c
+++ b/src/core/core-util.c
@@ -166,6 +166,8 @@ util_get_time_string (const time_t *date)
 /*
  * Formats date and time like strftime (but with timeval structure as input)
  * and adds extra specifiers:
+ *   - "%@": return the date expressed in Coordinated Universal Time (UTC)
+ *           instead of date relative to the user's specified timezone
  *   - "%.1" to "%.6": first N digits of microseconds, zero-padded
  *   - "%f": alias of "%.6" (microseconds, zero-padded to 6 digits)
  *   - "%!": timestamp as integer, in seconds (value of tv->tv_sec)
@@ -176,14 +178,15 @@ util_strftimeval (char *string, int max, const char *format, struct timeval *tv)
 {
     char **format2, str_temp[32];
     const char *ptr_format;
-    struct tm *local_time;
-    int length, bytes;
+    struct tm *date_time;
+    int length, bytes, local_time;
     long usec;
 
     if (!string || (max <= 0) || !format || !tv)
         return 0;
 
     string[0] = '\0';
+    local_time = 1;
 
     if (!format[0])
         return 0;
@@ -206,6 +209,11 @@ util_strftimeval (char *string, int max, const char *format, struct timeval *tv)
             string_dyn_concat (format2, "%%", -1);
             ptr_format += 2;
         }
+        else if ((ptr_format[0] == '%') && (ptr_format[1] == '@'))
+        {
+            local_time = 0;
+            ptr_format += 2;
+        }
         else if ((ptr_format[0] == '%') && (ptr_format[1] == '.'))
         {
             if ((ptr_format[2] >= '1') && (ptr_format[2] <= '6'))
@@ -242,14 +250,17 @@ util_strftimeval (char *string, int max, const char *format, struct timeval *tv)
         }
     }
 
-    local_time = localtime (&(tv->tv_sec));
-    if (!local_time)
+    if (local_time)
+        date_time = localtime (&(tv->tv_sec));
+    else
+        date_time = gmtime (&(tv->tv_sec));
+    if (!date_time)
     {
         string_dyn_free (format2, 1);
         return 0;
     }
 
-    bytes = strftime (string, max, *format2, local_time);
+    bytes = strftime (string, max, *format2, date_time);
 
     string_dyn_free (format2, 1);
 
diff --git a/tests/unit/core/test-core-util.cpp b/tests/unit/core/test-core-util.cpp
index 19ff4a94c..e5e9e6f04 100644
--- a/tests/unit/core/test-core-util.cpp
+++ b/tests/unit/core/test-core-util.cpp
@@ -185,6 +185,11 @@ TEST(CoreUtil, Strftimeval)
                                      "%H:%M:%S", &tv));
     STRCMP_EQUAL("10:29:09", str_time);
 
+    strcpy (str_time, "test");
+    LONGS_EQUAL(8, util_strftimeval (str_time, sizeof (str_time),
+                                     "%@%H:%M:%S", &tv));
+    STRCMP_EQUAL("10:29:09", str_time);
+
     strcpy (str_time, "test");
     LONGS_EQUAL(19, util_strftimeval (str_time, sizeof (str_time),
                                       "%Y-%m-%d %H:%M:%S", &tv));