I'm not sure I understand the question, but the timeframes on the EHAS website refer to when your flight that is non-stop to SXM, without any layovers, so the timeframe is from when your flight from Toronto leaves. An antigen test is only good for 24 hours, so the latest you could take an antigen test is February 23 at 10 AM. PCR test would be February 22 at 10 AM.


Carol Hill