Tier 3 (complete):
DateField, DatePicker, DateRangeField, DateRangePicker
Tier 4 (partial):
TimeField, TimePicker (TimeRangeField pending)
Core:
$lib/util/dias/segments.ts — pure domain primitives for segmented
date/time inputs (constants, guards, initializers, reconciliation,
content generation, Intl opts)
soma/external/dates re-exports everything (no façades inside soma)
soma/datetime/ slimmed to UI-only helpers (announcer, DOM segment nav,
SegmentState, KEYS predicates, description writers)
Conventions established (A23–A29):
A23 — never re-implement date helpers; extend dias
A24 — readonlySegments without value anchor logs warning
A25 — range components split readonly per-endpoint
A26 — contenteditable segments use onbeforeinput to block IME/paste
A27 — picker composition pattern with shared writableActive refs
A28 — time placeholders render as hh/mm/ss via dias/segments
A29 — demo pages are interactive testbeds, not static galleries
Demo pages: Material Design 3 styled, every public prop wired to a live
control, Field integration + state readout. Day-period uses real radio
group in 12h mode. Auto-anchor on range pickers keeps the end month
visible. 12h sliders map 0↔12 / 13-23↔1-11 correctly.
Docs: COMPONENT_GUIDE.md + SOMA_ARCHITECTURE.md updated with A23–A29,
checklist items 28–31, picker composition section, dias boundary,
directory structure note for soma/datetime/.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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