The exact form (in which) DOS asks for the date and time ...

[sitifan]

The exact form DOS asks for the date and time may vary slightly from version to version, but here is a typical opener. (Peter Norton)

Can I say "The exact form in which DOS asks for the date and time may vary slightly from version to version, but here is a typical opener"?

 

[GoesStation]

That's possible.

You told us the author or, quite likely, the publisher. What is the title?

 

[emsr2d2]

Yours is certainly an improvement on the original which isn't grammatically correct. It could be worded in several ways:

The form in which DOS asks for the time and date may vary ...
The form which DOS asks for the time and date in may vary ...
The form that DOS asks for the time and date in may vary ...
The form DOS asks for the time and date in may vary ...

I would have expected "format", not "form".

 

[sitifan]

You told us the author or, quite likely, the publisher. What is the title?

Peter Norton's DOS Guide.