How to add text on Signature Pad?


I am trying to capture a signature using the signature pad and add a date and time stamp to the bottom of it before everything in the signature pad is converted to an image. I have got the signature part of it working, just trying to figure out the date and time part. Any advice on how I can do so?
If someone can tell me how to add the date and time to the bottom of the converted signature image, that could also work. Any help appreciated.
Thank you!