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fix(history): date candles in Jakarta time, not UTC

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MSN stamps each IDX trading day at local midnight (17:00Z the previous
day), so every MSN candle was labelled one day early. Yahoo weekly and
monthly bars have the same stamp and were labelled Sunday / last day of
the previous month. Take the date in the exchange offset instead: Yahoo's
meta.gmtoffset when present, else WIB (UTC+7).

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ld3fDSDiBzAaQvgZJX5NKM
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Claude 2026-10-02 14:27:49 +00:00
commit 0ba3d805a7
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6 changed files with 43 additions and 4 deletions
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8
src/api/msn/map.rs
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@ -648,7 +648,10 @@ pub(super) fn parse_history(
let volume = series_volume_at(series, idx);
out.push(Ohlc {
date: timestamp.date_naive(),
// MSN stamps each IDX day at local midnight (17:00Z the day before).
date: timestamp
.with_timezone(&crate::api::idx_offset())
.date_naive(),
open,
high,
low,
@ -935,7 +938,8 @@ mod tests {
let history = parse_history("BBCA.JK", &raw).expect("chart history should parse");
assert_eq!(history.len(), 3);
assert_eq!(history[0].date.to_string(), "2026-01-13");
// `2026-01-13T17:00:00Z` is midnight WIB on the 14th, the trading day it belongs to.
assert_eq!(history[0].date.to_string(), "2026-01-14");
assert_eq!(history[0].open, 8000);
assert_eq!(history[0].high, 8000);
assert_eq!(history[0].low, 8000);