const maxNanoSecondDigits = 9

	// Split string into seconds and sub-seconds parts.
	ss, sn, _ := strings.Cut(s, ".")

	// Parse the seconds.
	secs, err := strconv.ParseInt(ss, 10, 64)
	if err != nil {
		return time.Time{}, ErrHeader
	}
	if len(sn) == 0 {
		return time.Unix(secs, 0), nil // No sub-second values
	}

	// Parse the nanoseconds.

        * [Advanced Middleware](https://fastapi.tiangolo.com/advanced/middleware/).
        * [Including WSGI - Flask, Django, others](https://fastapi.tiangolo.com/advanced/wsgi/).
    * PR [#1064](https://github.com/tiangolo/fastapi/pull/1064).

## 0.50.0

* Add link to Release Notes from docs about pinning versions for deployment. PR [#1058](https://github.com/tiangolo/fastapi/pull/1058).