diff --git a/Userland/Libraries/LibCore/DateTime.cpp b/Userland/Libraries/LibCore/DateTime.cpp
index 25df6ca1cf..09e36addf2 100644
--- a/Userland/Libraries/LibCore/DateTime.cpp
+++ b/Userland/Libraries/LibCore/DateTime.cpp
@@ -283,6 +283,7 @@ Optional<DateTime> DateTime::parse(StringView format, DeprecatedString const& st
     struct tm tm = {};
 
     auto parsing_failed = false;
+    auto tm_represents_utc_time = false;
 
     auto parse_number = [&] {
         if (string_pos >= string.length()) {
@@ -487,6 +488,7 @@ Optional<DateTime> DateTime::parse(StringView format, DeprecatedString const& st
             break;
         }
         case 'z': {
+            tm_represents_utc_time = true;
             if (string[string_pos] == 'Z') {
                 // UTC time
                 string_pos++;
@@ -538,6 +540,13 @@ Optional<DateTime> DateTime::parse(StringView format, DeprecatedString const& st
         return {};
     }
 
+    // If an explicit timezone was present, the time in tm was shifted to UTC.
+    // Convert it to local time, since that is what `mktime` expects.
+    if (tm_represents_utc_time) {
+        auto utc_time = timegm(&tm);
+        localtime_r(&utc_time, &tm);
+    }
+
     return DateTime::from_timestamp(mktime(&tm));
 }
 }