كَصَوْمِ رَمَضَانَ، وَالنَّذْرِ الْمُعَيَّنِ،
Translation: Such as the fast of Ramadan and a vow for a particular day.
Ramadan fasting is fixed by the sacred month. A specified vow names a valid day for fasting. Quduri groups both together for this particular intention-timing rule.
For example, a legally valid vow to fast on an upcoming Monday fixes the date. It differs from a vow to fast some unspecified day in the future.