When you seek out Social Security Disability benefits, you will need to prove your disability exists and that it is compliant with the rules and regulations set forth by the Social Security Administration (SSA). One of these aspects is the "disability onset date" which is the date at which you became unable to work anymore as a result of your disability or medical condition. This date is important for many reasons, not least of which is that it is used to determine when your benefit payment period begins.
If you apply for Social Security disability benefits, the likelihood that your claim goes through unabated and without a hitch is not very high. It's an unfortunate reality, but the reality none the less. So, if (and likely when) your claim is denied, you need to know how to deal with that situation. Don't let it defeat you because there are many ways for you to proceed down the appellate path.