For the fast vowed for a specified day, an intention before true dawn is not necessary; an intention before the half-day boundary, Nisf al-Nahar, is sufficient in the stated cases.
• A general fasting intention fulfills that day's vowed fast.
• An intention of a voluntary fast also fulfills that day's vowed fast.
• If no intention was made before true dawn, then an intention for another obligatory fast is made afterward but before Nisf al-Nahar, it still counts as the fixed-day vowed fast.
In the last case, notice both details: there was no pre-dawn intention, and the later intention was made before the specified boundary.
- Intention on the Vowed Day