Function parse_timestamp_fields_normalized 

pub fn parse_timestamp_fields_normalized(
    timestamp: &str,
) -> (Option<String>, Option<String>, Option<String>, Option<String>, Option<bool>)

Fast-path companion to parse_timestamp_fields for callers that have already weekday-normalised the input (e.g. parser::finalize_task, where info.timestamp was assembled from extract_timestamp_normalized’s regex captures over a normalize_weekdays output). Skipping the second normalisation removes a per-task Aho-Corasick scan on the timestamp substring.