feat: add --until, today/yesterday keywords; harmonize date flags#8
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Aligns withings-export with the shared quantcli date-flag contract (https://github.com/quantcli/common/blob/main/CONTRACT.md#3-date-flags): --since VALUE inclusive lower bound --until VALUE inclusive upper bound (new) VALUE: today | yesterday | YYYY-MM-DD | Nd/Nw/Nm/Ny Wired through every subcommand that selects a window of data: activity, sleep, workouts, measurements, intraday. ymd-format API params get the inclusive end day; epoch params get the exclusive moment. The sleep --derive iteration loop now respects --until instead of always running to time.Now(). Side effect: relative durations now snap to local midnight. --since 30d previously meant "30 days ago at this exact moment", which made the same command return slightly different results depending on the time of day. It now means "midnight of the day 30 calendar days ago", which matches how absolute dates already worked. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This was referenced Apr 25, 2026
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Summary
Part 2 of 3 in cross-repo date-flag harmonization across the quantcli export CLIs. Aligns this CLI with the shared contract at quantcli/common/CONTRACT.md §3.
```
--since VALUE inclusive lower bound
--until VALUE inclusive upper bound (new)
VALUE: today | yesterday | YYYY-MM-DD | Nd/Nw/Nm/Ny
```
Wired through activity, sleep, workouts, measurements, intraday. ymd-format API params (`enddateymd`) get the inclusive end day; epoch params (`enddate`) get the exclusive moment. The `sleep --derive` iteration loop respects `--until` instead of always running to `time.Now()`.
One semantic change worth flagging
`--since 30d` previously meant "30 days ago at this exact moment" (`time.Now().AddDate(0,0,-30)`). It now means "midnight of the day 30 calendar days ago". Same as how `--since 2025-01-01` already worked. Matches user intent better — running the same command at 11:59pm vs 12:01am should not return different windows.
Test plan
Cross-repo status
🤖 Generated with Claude Code