Insert date into 1000 photos' EXIF data

Job ID: 35543851

Budget: $15 – $25 USD

I have about 980 photos in PNG format located on Dropbox that were physical photos and then scanned in many years after they were taken. As such their EXIF tags for "Date/Time (Original)" and "Date/Time" are blank. However I've recorded a date for each photo n an Excel spreadsheet. I