Is the 72-hour limit for COVID-19 testing based on the test time or the result date?

The 72-hour requirement for COVID-19 testing relates to the time of the actual test (time stamp when the test was taken), not the date on the result letter. However, needs may vary depending on the departure country, for example, for travelers from the U.K., the results must be issued no more than 72 hours prior to the scheduled flight time. This has led to some confusion, as some individuals are receiving different interpretations of the rules. It's often recommended to confirm specifics based on the traveler's country and any applicable airline guidelines.