So recently i moved all my photos to Google Photo from a dropbox backup and while moving i realized i have around 1000+(out of several thousands of) photos which don't have valid created/modified date. It took the date from the day i moved them to google photos which is very surprising. May be dropbox removed those exif information some how. I really wan't to get the dates back because that will help me sort things up easily and also lot of memories are associated with these pics. The only way that information is available now is on the file name. Please see the screenshot below.
Is there a automated way/software which can help me with this, may be take the file name, convert to date and time and put it to meta data? TIA.