It sounds like you are asking about the Cutoff Eligibility. Cutoff Eligibility for Time- and Interval-based cutoffs is determined by the filing date of the parent record folder, not by the individual records. By default, the filing date is the creation date of the Record Folder. You can change the filing date for the Record Folder if necessary. If you have a regular document that you then move into a Record Folder, the Cutoff Eligibility is determined by the filing date for that record folder.
Example:
You have decided to use Laserfiche Records Management. You create a Record Folder with an Interval cutoff instruction, where the interval is one year, and put move a document into this folder.
Currently, the folder and the document (now a record) have a filing date of today's date (5/13/2014), which means they would be eligible for cutoff one year from today. However, since the document was actually created on the 7th of last month, before you used Records Management, you want it to be eligible one year from the 7th of last month.
To do this, you would change the filing date of the Record Folder to 4/6/2014.