--- old/qtbase/src/tools/rcc/rcc.cpp
+++ new/qtbase/src/tools/rcc/rcc.cpp
@@ -207,7 +207,11 @@ void RCCFileInfo::writeDataInfo(RCCResourceLibrary &lib)
     if (lib.formatVersion() >= 2) {
         // last modified time stamp
         const QDateTime lastModified = m_fileInfo.lastModified();
-        lib.writeNumber8(quint64(lastModified.isValid() ? lastModified.toMSecsSinceEpoch() : 0));
+        quint64 lastmod = quint64(lastModified.isValid() ? lastModified.toMSecsSinceEpoch() : 0);
+        static const quint64 sourceDate = 1000 * qgetenv("QT_RCC_SOURCE_DATE_OVERRIDE").toULongLong();
+        if (sourceDate != 0)
+            lastmod = sourceDate;
+        lib.writeNumber8(lastmod);
         if (text || pass1)
             lib.writeChar('\n');
     }