diff --git a/src/script/utils/qscriptdate.cpp b/src/script/utils/qscriptdate.cpp
index 5980256..b02c352 100644
--- a/src/script/utils/qscriptdate.cpp
+++ b/src/script/utils/qscriptdate.cpp
@@ -269,8 +269,9 @@ static inline qsreal DaylightSavingTA(double t)
     return (tmtm->tm_isdst > 0) ? msPerHour : 0;
 #else
     Q_UNUSED(t);
-    /// ### implement me
-    return 0;
+    TIME_ZONE_INFORMATION tzInfo;
+    GetTimeZoneInformation(&tzInfo);
+    return -tzInfo.DaylightBias * 60 * 1000;
 #endif
 }