In the prayer timing chart for your area, today the time for subah sadiq (the break of dawn) was at 3.56 am, therefore, if this chart is correct and has been authenticated, subah sadiq occurs at 3.56 am in your area, on this date. This means that the time for fajr on that day begins at 3.56 am and the time for suhoor ends at this time (i.e., 3.56 am) as well.
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دلائل:
القرآن الکریم: (البقرة، الایة: 187)
وَ کُلُوۡا وَ اشۡرَبُوۡا حَتّٰی یَتَبَیَّنَ لَکُمُ الۡخَیۡطُ الۡاَبۡیَضُ مِنَ الۡخَیۡطِ الۡاَسۡوَدِ مِنَ الۡفَجۡرِ۪ ....الخ
Allah the Almighty knows best.
Darul ifta Al-Ikhlas, Karachi.