diff --git a/opensource/JulianDay.m b/opensource/JulianDay.m
index 702a106..5b5f667 100644
--- a/opensource/JulianDay.m
+++ b/opensource/JulianDay.m
@@ -22,7 +22,7 @@ end
 y = utcTime(:,1);
 m = utcTime(:,2);
 d = utcTime(:,3);
-h = utcTime(:,4) + utcTime(:,5)/60 + utcTime(:,5)/3600;
+h = utcTime(:,4) + utcTime(:,5)/60 + utcTime(:,6)/3600;
 
 %check that date is in valid range
 if ( any(y<1901) || any (y>2099) )