Many online forms require a graduation date.
Asking however allows for a possible Human Rights Violation on the basis of age filed against the employer. Once hired however, Date Of Birth can be obtained (pension plans, medical plans, etc.....). Asking age, gender, race, ethnicity, marital status, education all offer the opportunity for discrimination law suits.
It is unlawful to ask a job applicant for the year they graduated from high school. I'm not sure if it would work as a workaround, but I'd also suggest making up a nonsensical year, and then mentioning it to the interviewer. I bet there are companies who don't even realize that the software they are using has illegal aspects to it, so it's worth giving them the benefit of the doubt.
