$(Get-Item ).creationtime=$(Get-Date "mm/dd/yyyy hh:mm am/pm")
$(Get-Item ).lastaccesstime=$(Get-Date "mm/dd/yyyy hh:mm am/pm")
$(Get-Item ).lastwritetime=$(Get-Date "mm/dd/yyyy hh:mm am/pm")

$(Get-Item aaa.csv).lastwritetime=$(Get-Date)

$(Get-Item foo.txt).creationtime=$(Get-Date "11/24/2015 06:00 am")

copy /b filename.ext +,,

touch -t 200001310001.00 test.txt