How do I calculate time between events?

Endpoint and detailed longitudinal data in DF12 contains approximated event date APPROX_EVENT_DAY, which is random (up to +/-15 day) offset added for the exact dates for each participant (see Data masking/blurring of visit dates). In this way you can calculate exact time between events and also compare the temporal order of events between different registers for each individual participant (see Is there really no participant birth year data in Sandbox?). In DF12 also EVENT_AGEs contains 3-digits, in which way you can quite accurately calculate time between events.