# File Modified Dates updated Unnecessarily

**URL:** https://community.mp3tag.de/t/file-modified-dates-updated-unnecessarily/19340
**Category:** General Discussion
**Created:** [September 10, 2017, 7:27pm UTC](https://community.mp3tag.de/t/file-modified-dates-updated-unnecessarily/19340 "2017-09-10T19:27:37Z")
**Posts on this page:** 1
**Showing post:** 1

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### Author: ![phossler](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/p/278dde/32.png) [@phossler](https://community.mp3tag.de/u/phossler)
#### Post date: [September 10, 2017, 7:27pm UTC](https://community.mp3tag.de/t/file-modified-dates-updated-unnecessarily/19340/1 "2017-09-10T19:27:37Z")

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I've noticed that if I have a group of files selected in the MP3Tag window and apply a change that only affects some, the Windows modified date/times for all the selected files are updated

I had a few files that had an extended tag set wrong, and rather that search one at a time, I selected the whole folder and set the proper tag, expecting that only a few files would be modified

Example:

1. Copy a group of files to a temp folder (Comment field in all was blank)

2. Apply MP3Tag to the folder and add a comment to one file

3. Modify date for that file is updated

4. Select all files

5. Make Comment = and Save (ctrl-S)

6. Modify dates for all files are updated

Doing a backup that compared modify dates to determine which files have change take a LOT longer since so many unchanged files are backed up

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