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Looking for a tool to change a file's modified date which works from inside File Explorer context menu. I am aware of external tools like BulkFileChanger but I want to right click on a file and make the change.

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This one is freeware, and will change what you need plus various attributes that users don't normally have access to:

  Attribute Changer
  http://www.petges.lu/

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    Can be found in your file's context menu after install. – amenthes Jan 30 '15 at 0:02
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You can use File Date Touch - Windows version of UNIX touch command

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    Welcome to superuser.com, Neil! Does 'File Date Touch' really work from within the context menu, or is it a separate utility? Also, does it have different functionality / benefits over the suggestion in the accepted answer? – einpoklum Apr 4 '13 at 21:12
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    @einpoklum I can answer that - yes it does have benefits - it DOESN'T show in context menu :) which I find great. Google has redirected me to this question, but on the other hand, I was looking for precisely this answer! Thanks Neil. – Aleks Oct 27 '13 at 16:01
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I know its probably too late to answer this, but apparently this http://stefanstools.sourceforge.net/SKTimeStamp.html does exactly what OP wanted:

SKTimeStamp is a very simple shell extension which adds a new tab to the Explorer properties dialog. On that new tab, you can change the file/folder date and time.

Available for x86 and x64 Windows systems.

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You can change the create date from the command line. You must first change the system clock date, then open a command prompt window at the current working directory, and issue the command:

copy /b [filename] + ,,

This uses the concatenation directive with the binary (/b) switch, basically copying the file to itself and incidentally setting the create date of the "new" file to the current system clock.

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    This does not answer the question, which explicitly insists on an answer that works inside File Explorer. – Kazark Apr 22 '13 at 16:39
  • I was just looking for a way to change the mtime on a file and this method worked great for me. – stevepastelan Jan 14 '14 at 18:05
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    This does not answer the question, but the OP might find it useful -- there are lots of reasons why a question might not be phrased in exactly the way that leads to useful information -- and others, like me, looking for answers, might also find it useful. – user184411 Oct 22 '16 at 22:40
  • For some reason this didn't quite work for me, but doing copy /b [filename] [new_filename] did. Also I had to use cmd instead of powershell. Thanks – Taran Nov 27 '17 at 10:39

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