desktop/src-tauri/crates/core/tests/calendar_v04.rs

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//! V04: midnight, leap days, ISO week-year boundaries, Sunday starts and 23/25-hour DST days.

//! Half-open intervals, correct week-year/local dates and distinguishable repeated hours.

/// A request spanning midnight defaults to the local day containing completion.

// UTC start 23:55 on day1; completion 00:10 on day2.

/// Leap day 2024-02-29 is valid; half-open endpoints select the correct day.

// Exactly the start of February 29.

// Exactly the start of March 1.

/// 2025-12-29 through 2026-01-04 is ISO 2026-W01; labels include the week-year.

/// Sunday-start weeks use their start date as the label.

// Sunday-start week begins 2025-12-28; its start date is its label.

/// America/New_York DST gives 23 hours on 2026-03-08 and 25 hours on 2026-11-01.

/// Repeated-hour instants have different UTC offsets but belong to the same local day.

// Spring advance: 2026-03-08 02:00 does not exist; this local day has 23 hours.

// Instants on both sides of the gap belong to 2026-03-08.

// Local time 01:30 EST.

// Local time 03:30 EDT.

// Fall retreat: 2026-11-01 has 25 hours; 01:30 occurs twice with different offsets.

// Local time 01:30 EDT (UTC-4).

// Local time 01:30 EST (UTC-5).

// Full ingestion/query path groups both repeated-hour events into the same local day.

/// The UTC interval for a week spanning DST covers the complete half-open week.

// Monday-start week containing 2026-11-01: 2026-10-26 through 2026-11-01.

// This week contains a 25-hour day: 7*24+1 hours in total.