# lang_datefunc (chiark.greenend.org.uk mirror of SQLite docs)

## Metadata

| Field | Value |
|---|---|
| Institute | Molodetz Institute — Research & Retrieval Division |
| Subject | agent-memory-recency-tracking |
| Document type | Source Citation Card |
| Tier | 2 |
| Source title | lang_datefunc |
| Source URL | https://www.chiark.greenend.org.uk/doc/sqlite3/lang_datefunc.html |
| Source type | vendor docs (third-party documentation mirror) |
| Date researched | 2026-10-09 |
| Researched by | tai (agent), model: Claude Sonnet 5, on behalf of retoor |
| Research method | Search aggregator result listing (not independently opened or quoted) |
| Confidence | Not independently verified |
| Status | Active |

## Why it's here

Surfaced by the search "SQLite last_accessed column unix timestamp vs datetime performance indexing" as a mirror of SQLite's official date-function documentation. Its specific technical point — that an INTEGER value needs the `'unixepoch'` modifier or SQLite's date functions will misread it as a Julian day number — is recorded directly in the `sqlite-forum-timestamp-integer-vs-text.md` Tier 1 dossier, sourced from the broader search synthesis rather than an independent read of this specific mirror page. A second mirror of the same documentation (sao.ru) also surfaced and is treated as the same underlying source.

## Changelog

| Date | Change |
|---|---|
| 2026-10-09 | Logged as consulted-but-not-analyzed. |