Fixes#14935
## Summary
The date picker had a hardcoded `_minYear = 1970` in
[`date-picker.ts`](blocksuite/affine/components/src/date-picker/date-picker.ts),
which prevented users from selecting dates earlier than 1970. This
blocked legitimate use cases like historical and genealogical research
(see the reporter's comment on #14935).
## Fix
Lower the date picker's `_minYear` from `1970` to `1000`. The underlying
storage is just a `zod.number()` (Unix timestamp in ms), which supports
negative values, so no data-layer or backend changes are required — this
is a UI-only constraint relaxation.
## Demo
<img width="2044" height="1250" alt="image"
src="https://github.com/user-attachments/assets/4b25b333-89c4-48e6-9f91-81781d680200"
/>
## Test plan
- [x] Insert a database in a doc → add a Date column
- [x] Click a date cell → open the picker → click the year label →
navigate back through decades
- [x] Confirm the calendar reaches years well before 1970 (verified at
May 1805)
- [x] Confirm the calendar correctly renders weekdays for historical
dates
- [x] Confirm picking a modern date still works as before
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Date picker now allows selecting dates from year 1000 onward,
expanding historical date coverage.
* **Bug Fixes**
* Navigation (month switches and keyboard arrows) now keeps the
selection cursor within the allowed year range, preventing out-of-range
jumps.
[](https://app.coderabbit.ai/change-stack/toeverything/AFFiNE/pull/14942)
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Abdul Rehman
