When you change phones restore backups or copy photos through a PC the file modified date may change to the copy date.
Many gallery apps sort photos by the modified date so old photos may appear as if they were newly taken.
File Date Fixer is a tool that fixes file modified dates based on the shooting date stored in Exif metadata.

Main features:
・Review modified dates and Exif dates in a file list
・Check the time difference between modified date and Exif date
・Automatically fix modified dates based on Exif dates
・Manually select and set a modified date
・Review files one by one and fix them continuously
・Batch fix images in a selected folder by page
・Include subfolders when searching
・Display image video and audio files in the list
・Request MediaStore rescan after fixing files

About automatic fixing:
Automatic fixing is available only for image files whose Exif shooting date can be read.
Files without Exif dates or files whose Exif data cannot be read are not eligible for automatic fixing.
For those files you can use manual fixing to set any date and time.

Notes:
・This app changes file modified dates.
・This app does not rewrite image data or Exif metadata.
・Depending on your Android version device behavior or file location additional permission may be required.
・It may take some time for gallery apps to reflect the changes.
・The developer is not responsible for any problems file inconsistencies file corruption data loss or any other damage caused by using this app. Please use it at your own risk.