Fix Yahoo date parsing with mixed timezone formats#2265
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YahooCollectorCN1d.download_index_data calls pd.to_datetime(df['date']) on timestamps from East Money API that may include timezone offsets (e.g. ' 09:30:00+08:00'). Similarly, YahooNormalize.normalize_yahoo calls pd.to_datetime(df.index) on date strings from Yahoo Finance. Without specifying format='mixed', pd.to_datetime raises when it encounters mixed formats in the same column — some entries are date-only strings while others carry timezone info. Adding format='mixed' lets pandas infer the format per-entry and parse them correctly.
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Fix Yahoo date parsing with mixed timezone formats