diff --git a/modules/yup_core/zip/yup_ZipFile.cpp b/modules/yup_core/zip/yup_ZipFile.cpp
index c58e33822..dab1a862b 100644
--- a/modules/yup_core/zip/yup_ZipFile.cpp
+++ b/modules/yup_core/zip/yup_ZipFile.cpp
@@ -687,7 +687,7 @@ struct ZipFile::Builder::Item
 
     static void writeTimeAndDate (OutputStream& target, Time t)
     {
-        target.writeShort ((short) (t.getSeconds() + (t.getMinutes() << 5) + (t.getHours() << 11)));
+        target.writeShort ((short) ((t.getSeconds() >> 1) + (t.getMinutes() << 5) + (t.getHours() << 11)));
         target.writeShort ((short) (t.getDayOfMonth() + ((t.getMonth() + 1) << 5) + ((t.getYear() - 1980) << 9)));
     }