What is the ruling on a man who intentionally prays some of the rak'ahs of the witr prayer outside its time?

Question : If a person intentionally delays part of the witr prayer until after the adhan, for example, if he wakes up and intends to pray a large number of rak'ahs, saying, "I will now pray five, knowing for certain that the first and second are before Fajr, and the second and the rest are after Fajr."

Answer : I believe, if Allah wills, that this is a permissible stratagem. That is, instead of completing the witr with three rak'ahs, he separates them with a taslim, saying, "I will keep the prayer as three all together so that I have caught one rak'ah within the time." It appears that there is no harm in this, if Allah wills, provided that the mu'adhdhins who call to prayer according to the current calendar call at least five minutes before the time. This is because many trustworthy people went out to the desert to observe the dawn and found it to be delayed significantly. Likewise, some calculators with precise knowledge of calculation have determined that this calendar is five minutes early. We say, if Allah wills, that there is good in this, because it encourages people who intend to fast to eat whatever remains of their suhur. However, there is another concern regarding this early calling, which is that a person might pray before the time.