Function file_occurrences 

pub fn file_occurrences(
    path: &Path,
    calendar: &Collection,
    from: i64,
    to: i64,
    zone: &TimeZone,
) -> Vec<Occurrence>

The occurrences of one file’s events between from and to (Unix seconds); times written without a zone are taken in zone, yours. Expanded from just before from (from_window), not from each event’s start.