Daylight Saving - for Shadow Study

Rendering V-Ray
, , ,
1

Hi,

Im doing a shadow study with Rhino and the Vray plugin.

Im using the native sun system and was wondering when to use the daylight saving setting? Is this just for summer months?

Rhino 5
Vray Rhino 2.0

Pasted image375×731 63.3 KB

Thanks.