The law of asylum requires applicants to file their form I-589 within one year of arriving in the United States; otherwise, their case can be denied as untimely. There are exceptions to the one-year filing rule, and if you are relying on one of those, you would normally include that information in the I-589 at the time of filing.
However, it is also possible to qualify for an exception to the one-year bar after you file for asylum. I recently employed some nifty case law to help a client overcome the one-year bar and win asylum, and I imagine that other late filers might benefit from this client’s experience.