Not having the intention to observe Sawm until 07:00 am on the first day of Ramadan
On the first day of Ramadan, we did not have intention to observe Sawm (Fast) until 07:00 am because we did not know that Wednesday was the start of Ramadan except (Part No. 9; Page No. 149) till the morning. Is our Sawm on that day valid?
Have I to make up for that day because I had no intention except after its proper time?
You have to make up for the day on which you did not intend to observe Sawm from the previous evening. Having intention the night before Sawm is a condition for the validity of obligatory Sawm. The Prophet (peace be upon him) stated:
Whoever does not determine to fast before dawn has not fasted.
(Related by the Five Compilers of Hadith [Imams Ahmad, Abu Dawud, Al-Tirmidhy, Al-Nasa'y, and Ibn Majah])