sequenceDiagram
    participant Caller
    participant create_wal_dir_datetime_filter
    participant Filter Closure
    participant month_days Array

    Caller->>create_wal_dir_datetime_filter: start_time, end_time, extension_pattern, skip_count
    create_wal_dir_datetime_filter->>Filter Closure: creates closure
    
    loop For each path
        Caller->>Filter Closure: path (e.g., files/org/stream/2024/12/01/12/)
        Filter Closure->>Filter Closure: parse year from path (e.g., 2024)
        Filter Closure->>Filter Closure: parse month from path (e.g., 12)
        
        alt Month parsing succeeds
            Filter Closure->>month_days Array: access [(month - 1) as usize]
            Note over Filter Closure,month_days Array: Fixed: month=12 now maps to index 11<br/>Previously: month=12 caused panic at index 12
            month_days Array-->>Filter Closure: returns days (31)
            Filter Closure->>Filter Closure: apply leap year adjustment if month==2
            Filter Closure->>Filter Closure: parse day and validate against days
            Filter Closure->>Filter Closure: parse hour and validate
            Filter Closure->>Filter Closure: check datetime range
            Filter Closure-->>Caller: true/false
        else Month parsing fails
            Filter Closure-->>Caller: uses start_time.month() as default
        end
    end