small problem , please help

i have txt file
it has creation data of x for example , then i modified it

And what kind of computer system did you do this on? I'm assuming Windows.
After you modified the file, it retains the creation date, but has new 'modified' date.

i burned it into cd now it has creation date of y

And is y the 'modified' date and time or the date and time that the CD was created? Or something else entirely? The CD burning tool decides which date and time to use.

how can i know x if i forget it ?

You mean, from the CD alone? You can't. If you want to do that, you have to ensure that the program you used to create the CD keeps the x date as the CD file timestamp, or logs it somewhere.

isn't there any way to know what is the time of x???

Again, from the CD alone? Or from the computer used to create the CD? There might be, depending on what CD-creating tool you used. But in general, no, there isn't. All you can say in general is that the volume creation date of the CD must be later than x.

thanks for reply
i used windows xp regular burning just copied to the cd
does it log it some where?

thanks for reply
i used windows xp regular burning just copied to the cd
does it log it some where?

Does WinXP log the fact that you created a CD? No, not explicitly. There are ways you can determine if a CD may have been burned, but they aren't entirely definitive.

You should consider reading up on David Cowen's TriForce; however, this won't help you, as it uses artifacts that are not available by default on Windows XP systems.

i have txt file
it has creation data of x for example , then i modified it

Okay, so the text file, as it exists on the volume on which you created it (FAT, NTFS) has certain time stamps associated with it.

i burned it into cd now it has creation date of y
how can i know x if i forget it ?
isn't there any way to know what is the time of x???

There are too many variables and unknowns to answer the question. Assuming that you have JUST the CD and not the data from the original volume on which the file was created, you won't have access to "X".