cache is never updated

[matclab]

Looking at the code I see :

def load_cache(cachettl: int) -> Optional[List[Event]]:
    if not os.path.exists(CACHE_PATH):
        return None

    if os.path.getmtime(CACHE_PATH) - time.time() > cachettl * 60:
        return None
…

But os.path.getmtime(CACHE_PATH) - time.time() is negative and thus the function always return the cache content, whatever the value of cachettl is.