Does it count to get sunlight through a window?

Yes, sunlight through a window counts, but it is much less effective for regulating your circadian system than going outdoors.

• Window glass: Sunlight through a window is described as about 50 times less effective than outdoor light; the glass scatters and filters light, including relevant wavelengths. 1
• Outdoor light: Get outside for natural light, especially when the sun is low in the sky. Cloudy days still provide useful light, though you may need to stay outside longer. 2