The Environmental Protection Agency has created a prepublication of extending the dates that required labeling and testing must be performed. You can read the complete document here. When the final rule is issued the dates will be as follows:

• The end of the transition period for CARB Third-Party Certifiers (TPCs)is being changed from December 12, 2018 to March 22, 2019
• The requirement for import certification provisions is being changed from December 12, 2018 to March 22, 2019
• The requirement for the emission standards, recordkeeping, and labeling provisions is being changed from December 12, 2017 to December 12, 2018
• The deadline for laminated product producer provisions is being changed from December 12, 2023 to March 22, 2024