If-Modified-Since and If-Unmodified-Since as datetime instead of str

[tyzhnenko]

To use If-Modified-Since and If-Unmodified-Since headers the documentation proposes to child of FromHeader class. In this case a handler gets access to str value and this requires further manual conversion to datetime, like datetime.strptime(value, "%a, %d %b %Y %H:%M:%S %Z").

class IfUnmodifiedSince(FromHeader[Optional[str]]):
    name = "If-Unmodified-Since"

@app.router.get("/")
async def upload_image(if_modified_since: IfUnmodifiedSince) -> dict:
    dt = if_modified_since.value if if_modified_since else None
    return {
        "message": "This is a test endpoint for the BlackSheep application.",
        "If-Unmodified-Since": dt,
    }

I've tried to figure out how to use converters or BindVelue with convert to get datetime at the end. There were no workable solutions that came into my mind.

The overall idea get datetime value inside if_modified_since.value if the header is set.

Does anybody know how that can be achieved? I believe it's possible but it seems I missed something.