Regarding IT Professional Year Validity


My Professional Year commencement date is on 14th of October 2018 and Graduation date is on 13th of October 2022. Is it still valid to claim 5 migration points? Because in skill select it is asking " Had the applicant completed PY in last 48 month" and DHA website says within 4 years. What does it mean? Is that 48 months from PY start date or completion date?
Please give a clarity on this.

Thank you