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def dt2ts(dt: Optional[datetime]) -> Optional[int]:    
    return int(time.mktime(dt.timetuple())) if dt is not None else None
  
def dt2ts_ms(dt: Optional[datetime]) -> Optional[int]:
    return dt2ts(dt) * 1000 if dt is not None else None

def ts2dt(ts: Optional[int]) -> Optional[datetime]:    
    return datetime.utcfromtimestamp(int(ts)) if ts is not None else None

def ts_ms2dt(ts: Optional[int]) -> Optional[datetime]:    
    return ts2dt(int(ts/1000) if ts is not None else None