2 files changed, 20 insertions, 0 deletions
diff --git a/js/public/Date.h b/js/public/Date.h
index cba0ea875..cab36a3de 100644
--- a/js/public/Date.h
+++ b/js/public/Date.h
@@ -134,6 +134,14 @@ NewDateObject(JSContext* cx, ClippedTime time);
 JS_PUBLIC_API(double)
 MakeDate(double year, unsigned month, unsigned day);
 
+// Year is a year, month is 0-11, day is 1-based, and time is in milliseconds.
+// The return value is a number of milliseconds since the epoch.
+//
+// Consistent with the MakeDate algorithm defined in ECMAScript, this value is
+// *not* clipped!  Use JS::TimeClip if you need a clipped date.
+JS_PUBLIC_API(double)
+MakeDate(double year, unsigned month, unsigned day, double time);
+
 // Takes an integer number of milliseconds since the epoch and returns the
 // year.  Can return NaN, and will do so if NaN is passed in.
 JS_PUBLIC_API(double)
diff --git a/js/src/jsdate.cpp b/js/src/jsdate.cpp
index ccaeda2a3..00a8abf84 100755
--- a/js/src/jsdate.cpp
+++ b/js/src/jsdate.cpp
@@ -354,10 +354,22 @@ MakeDate(double day, double time)
 JS_PUBLIC_API(double)
 JS::MakeDate(double year, unsigned month, unsigned day)
 {
+    MOZ_ASSERT(month <= 11);
+    MOZ_ASSERT(day >= 1 && day <= 31);
+
     return ::MakeDate(MakeDay(year, month, day), 0);
 }
 
 JS_PUBLIC_API(double)
+JS::MakeDate(double year, unsigned month, unsigned day, double time)
+{
+    MOZ_ASSERT(month <= 11);
+    MOZ_ASSERT(day >= 1 && day <= 31);
+
+    return ::MakeDate(MakeDay(year, month, day), time);
+}
+
+JS_PUBLIC_API(double)
 JS::YearFromTime(double time)
 {
     return ::YearFromTime(time);