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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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16
src/api/yahoo/parse.rs
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@ -92,6 +92,22 @@ mod tests {
assert_eq!(history[0].close, 9875);
}
#[test]
fn history_dates_use_exchange_offset_not_utc() {
// Weekly bars are stamped at Monday 00:00 WIB, i.e. Sunday 17:00Z.
let raw = r#"{"chart":{"error":null,"result":[{
"meta":{"gmtoffset":25200},
"timestamp":[1790528400],
"indicators":{"quote":[{"open":[6000],"high":[6150],"low":[5975],"close":[6100],"volume":[1000]}]}
}]}}"#;
let history = parse_history_from_str("BBCA.JK", raw).expect("history parsed");
assert_eq!(history[0].date.to_string(), "2026-09-28");
let without_offset = raw.replace(r#""gmtoffset":25200"#, r#""symbol":"BBCA.JK""#);
let history = parse_history_from_str("BBCA.JK", &without_offset).expect("history parsed");
assert_eq!(history[0].date.to_string(), "2026-09-28");
}
#[test]
fn parses_realistic_fixture_json() {
let quote_raw =