Use FileTouch utility to change file dates and times.
Download FileTouch.exe (16 KB).
Here is the help screen containing complete description and examples
Usage: FileTouch [/?] [/W] [/A] [/C] [/S] [/D date] [/T time] filemask
Command line parameters:
|/?||Print this help.|
|/W||Change file modification date (Write date). This is the default.|
|/A||Change file last access date (Access date).|
|/C||Change file creation date (Create date).|
|/S||Touch subfolders. By default only files are touched.|
|/D||New file date. This switch must be followed by a date in mm-dd-yyyy format. If /D switch is not specified the current system date is used.|
|/T||New file time. This switch must be followed by a time in hh:mm:ss 24-hour time format. If /T switch is not specified the current system time is used.|
|filemask||The file mask to be used for the file search. Example: *.txt.|
Run FileTouch.exe without parameters from the DOS command prompt to see full description of the supported parameters. Multiple "change" switches can be used with a single FileTouch command. For example, FileTouch /W /A /C *.txt will change all 3 dates for all found text files.