The transition to WHMIS 2015 includes a three-stage transition period that’s synchronized across federal, provincial and territorial jurisdictions. But two transition deadlines have been extended. Manufacturers and importers now have until June 1, 2018 (rather than 2017) to comply with the Hazardous Products Regulation. The second deadline of June 1, 2018 has been delayed by three months to Sept. 1, 2018. But the target deadline set for employers remains unchanged at Dec. 1, 2018.