change date last opened command in mac

How i can change ( date last opened ) in Apple using terminal utility
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Dan CraciunIT ConsultantCommented:
touch -a date filename
AlkannetworksAuthor Commented:
that means
( touch -a 20150501 iphoto )
Dan CraciunIT ConsultantCommented:
I tested and you need this:
touch -c -t 201505010000 iphoto
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AlkannetworksAuthor Commented:
nothing was done
touch -c -t 201505010000 /users/pictures/iphoto \library.photolibrary
Dan CraciunIT ConsultantCommented:
What is the name of the file?
/users/pictures/iphoto \library.photolibrary looks strange

iphoto is a folder or a file?
AlkannetworksAuthor Commented:
iphoto is folder
If you want to change the last accessed time to the current date and time -
touch -c /path/to/file
If you want to change it to a specific time , as Dan suggested -
touch -c -t 201505190000 /path/to/file
The latter would change the access date to May 19. 2015 at 0 hours 0 minutes.
I would agree with Dan that the file path seems odd. To get to my iPhoto library the path is:
/Users/jaywyckoff/Pictures/iPhoto\ Library/Library.iPhoto

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Mac OS X

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