Today's date on the athlete's Blocks account, in their own time zone: ISO date, weekday, and ISO week. Call this to anchor any relative reasoning — 'today', 'tomorrow', 'this week', 'the weekend', 'in 3 days' — and to pass the correct date to other tools. zone names the time zone the date is in; when it says UTC their zone is unknown — if it may already be a different calendar day for them, say so and confirm rather than assume.