Use Z instead of z in the timestamp format

1 files changed, 1 insertions, 1 deletions

diff --git a/louloulibs/xmpp/xmpp_component.cpp b/louloulibs/xmpp/xmpp_component.cpp
index 46c070a..07d2408 100644
--- a/louloulibs/xmpp/xmpp_component.cpp
+++ b/louloulibs/xmpp/xmpp_component.cpp
@@ -447,7 +447,7 @@ void XmppComponent::send_history_message(const std::string& muc_name, const std:
   delay["from"] = muc_name + "@" + this->served_hostname;
   constexpr std::size_t stamp_size = 20;
   char date_buf[stamp_size];
-  std::strftime(date_buf, stamp_size, "%FT%Tz", std::gmtime(&timestamp));
+  std::strftime(date_buf, stamp_size, "%FT%TZ", std::gmtime(&timestamp));
   delay["stamp"] = date_buf;
 
   message.add_child(std::move(delay));