Last modified time and date is an attribute of file or folder that indicates about the file systems level when the file or folder was modified last time. Once the files contents are modified and saved, last modified date and time stamp is defined to correspond with the period of changes done. The objective of this attribute is to show once the last changes of file or folder were done.
Like several file attributes last modified time and date is recorded in file system together with file, away from the file contents. This file systems level time and date file property doesn't restrict the time and date stamps which can be kept in the file itself. Various programs placed their own starting time and date records inside the file contents or meta-tags like Microsoft 'office' products as well as other software. Virtually there might be personal files format which at the file content level presupposes infinite variety of file times and dates fixed, yet there is simply one last modified date and time attribute at the file systems level per file.
