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Replace Photos with Exif Wizard
The default Photos app annoys me for a number of reasons. Specifically, I can't understand why the app doesn't show me the date or time when a picture was taken, and refuses to give me access to the EXIF information stored with the photograph which contains detailed information relating to the photo.
The best app for this purpose is Exif Wizard. This can access photos from your photo rolls and show you all the hidden data saved along with the image.
If you want more features -- such as the ability to access photos stored on iCloud or work servers with images up to 13 megapixels in resolution -- you can upgrade to the Pro version for $1.99.
Image source: homedatasheet.com.