diff --git a/src/util/time.cpp b/src/util/time.cpp
--- a/src/util/time.cpp
+++ b/src/util/time.cpp
@@ -80,10 +80,12 @@
     struct tm ts;
     time_t time_val = nTime;
 #ifdef _WIN32
-    gmtime_s(&ts, &time_val);
+    if (gmtime_s(&ts, &time_val) != 0) {
 #else
-    gmtime_r(&time_val, &ts);
+    if (gmtime_r(&time_val, &ts) == nullptr) {
 #endif
+        return {};
+    }
     return strprintf("%04i-%02i-%02iT%02i:%02i:%02iZ", ts.tm_year + 1900,
                      ts.tm_mon + 1, ts.tm_mday, ts.tm_hour, ts.tm_min,
                      ts.tm_sec);
@@ -93,10 +95,12 @@
     struct tm ts;
     time_t time_val = nTime;
 #ifdef _WIN32
-    gmtime_s(&ts, &time_val);
+    if (gmtime_s(&ts, &time_val) != 0) {
 #else
-    gmtime_r(&time_val, &ts);
+    if (gmtime_r(&time_val, &ts) == nullptr) {
 #endif
+        return {};
+    }
     return strprintf("%04i-%02i-%02i", ts.tm_year + 1900, ts.tm_mon + 1,
                      ts.tm_mday);
 }