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In general, all domains based on the 3 general observation classes should have at least 1 timing variable. In the events 

Timing variables (SDTM Section 3.1.5, Timing Variables for All Classes) are an essential component of all SDTM subject-level domain datasets. In general, all domains based on the 3 general observation classes should have at least 1 timing variable. In the Events or Interventions general observation class, this could be the start date of the event or intervention. In the Findings observation class, where data are usually collected at multiple visits, at least 1 timing variable must be used.

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