Change how sunlight and shadows affect your scene during different times of the day and year. Open the Daylight tool in Daylight / Weather 
.
Sunlight slider
Under Time of Day, drag the slider left and right to adjust the sunlight and shadows in your scene at different times of the day. You can also adjust the time of day by clicking specific times on the slider.
Note:
The Daylight tool uses UTC time and does not account for the daylight saving times in different countries and regions of the world.
Click Play 
to animate
the sunlight as it cycles through the day in your scene.
Time zone
To change time zones, click the Time zone drop-down menu and choose from the drop-down list.
Date
Click the Date drop-down menu to choose a date and change the sun's position at different times of the year.
Click Play to animate
the sunlight as it cycles through the
months in a year in your scene.
Lighting
Sometimes when viewing scenes, the amount of light based on the sun position darkens the scene, especially in polar areas. Uncheck the Sun position by date and time checkbox to add lighting that illuminates the scene, in which the light source is fixed relative to the camera and ensures the scene is always well lit.
Shadows
Check the Shadows checkbox to illustrate shadows in your
scene. You can change shadow effects by adjusting the Sunlight slider , time zone, and Calendar options.
Glow effect
Check the Glow effect checkbox to emphasize the appearance of layers that have light emission elements in 3D styles. Move the slider from Low to High for less or more of the glow effect.
Scenes that don't have emissive elements are not affected by the glow effect.