Salah-ul-Fajr
Before Dawn, in between the time the sun begins to rise, and the time it is fully risen usually around 5am-6am
Salah-ul-Zohor
Around noon-time, when the sun is directly overhead around 12pm-1pm
Salah-ul-Asr
A little bit afternoon, but before evening, around 4pm-5pm
Salah-ul-Magrib
Right before sun sets, around 7pm and 8pm
Salah-ul-Isha
After sun has fully set usually a couple of hours after Maghrib around 10pm but one can hold off to pray Isha until late at night if one does not fall asleep first, soem say there is more rewards for the Isha prayer when it is prayed later in the night
Salah-ul-Tahajjud
This is a Sunnah or Nafl prayer that is to be prayed in odd numbers, like 3 or 5 units, in between Isha and Fajr, this was a practice of Prophet Muhammad(pbuh) that he slept a little bit after Isha and woke up and prayed this prayer then prayed fajr at dawn. It is said that the time between Isha and Fajr especially the last 1/3 of the night is when Allah is most closest to His creation, and that He looks down and to see if anyone is praying to Him and asking His for His Mercy and Forgiveness, so that He can forgive them and give them mercy. so when one prays this prayer at this time, Allah is more likely to be accept his or her prayer