best times for making dua

Question
Regarding best times to make Dua, I have read thefollowing hadith:
"Narrated Abu Omamah (radiAllahu anhu): that Allah's Messenger
(salAllahu alayhiwasalam)was asked, O Messenger of Allah, which
supplication is heard (by Allah (Subhanahu wa Ta'ala), he said the end
of the night and at the end of the obligatory Salat (prayer)
[at-Tirmidhi] This time is after saying 'At-tahyat' , and before
making Tasleem (finishingprayer)"
I wanted to know how can we interprete that themeaning of end of
obligatory salat is after saying 'At-tahyat' , and before making
Tasleem (finishing prayer)? Why does it not mean after making Tasleem
(finishingprayer)?
Answer
In the Name of Allah, the Most Gracious, the Most Merciful.
As-salāmu `alaykum wa-rahmatullāhi wa-barakātuh.
The hadith in reference is:
وَقَدْ أَخْرَجَ التِّرْمِذِيُّ مِنْ حَدِيثِ أَبِي أُمَامَةَ قِيلَ
أَيُّ الدُّعَاءِ أَسْمَعُ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ
عَلَيْهِ وَسَلَّمَ جَوْفُاللَّيْلِ الْأَخِيرِ وَدُبُرُ الصَّلَوَاتِ
الْمَكْتُوبَاتِ
Tuhfatul Ahwazi 2/169 [1]
The hadith states thatdua after farz salat is accepted.
The hadith is general.
It also refers to dua after making salam upon the completion of the salah.
In principle the salat terminates with Taslim (giving salam).
And Allah knows best.