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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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10
src/api/mod.rs
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@ -2,6 +2,8 @@ pub mod msn;
pub mod types;
pub mod yahoo;
use chrono::FixedOffset;
use crate::config::{HistoryProviderKind, ProviderKind};
use crate::error::IdxError;
use types::{
@ -9,6 +11,14 @@ use types::{
NewsItem, Period, Quote, SentimentData,
};
/// IDX trades in Western Indonesia Time (WIB, UTC+7, no DST). Providers stamp
/// candles in UTC, so day boundaries must be taken in this zone.
pub(crate) const IDX_UTC_OFFSET_SECS: i32 = 7 * 3600;
pub(crate) fn idx_offset() -> FixedOffset {
FixedOffset::east_opt(IDX_UTC_OFFSET_SECS).expect("valid WIB offset")
}
pub trait QuoteProvider {
fn quote(&self, symbol: &str) -> Result<Quote, IdxError>;
}