diff --git a/Foundation/CPDate.j b/Foundation/CPDate.j
index d65b4226a..b2aeb3b5f 100644
--- a/Foundation/CPDate.j
+++ b/Foundation/CPDate.j
@@ -24,7 +24,7 @@
 @import "CPString.j"
 @import "CPException.j"
 
-var CPDateReferenceDate = new Date(Date.UTC(2001, 1, 1, 0, 0, 0, 0));
+var CPDateReferenceDate = new Date(Date.UTC(2001, 0, 1, 0, 0, 0, 0));
 
 /*!
     @class CPDate