Take a photo how to add the date watermark

I use WebCamTexture to invoke webcam.
I use a UI.RawImage to display it. ( rawImage.texture = webCamTexture; )

I use Texture2D.EncodeToPNG() to save it to png.

Now I want to add a date watermark.

How should I do. please be specific. I am a beginner.

Hello, maybe you can use a watermark-adding tool, I have used one called Easepaint Watermark Expert, it can batch add watermark or any logo you want to your photos. In addition, it’s free and easy to use even if you are a new user, maybe you can just have a try.