I recommend the following copy edits to the English text of the text under information tab of “Forbidden Salat times”:
The Time of Sunrise
* Starts from: The time when the first portion of the sun becomes visible on the eastern horizon.
* Ends when: The entire sun is visible.
It is safe to start the Salat once the sun has risen to the height of a spear. In modern terms, this is considered to be approximately 12 minutes after sunrise. However, to be cautious, it is advisable to wait 15 to 20 minutes before beginning prayer. Avoid performing Salat during this period.
The Time of Sunset
* Starts from: When the sun just touches the western horizon. Some scholars also define this as when the sunlight begins to appear pale.
* Ends when: The entire sun has disappeared.
The forbidden period for prayer starts approximately 12 minutes before sunset, but to be safe, one should consider 15 to 20 minutes before sunset as the forbidden time. If necessary, set a reminder to complete your Salat before this time.
However, if a person somehow couldn’t and has not yet performed Asr Salat, they are permitted to pray that particular Asr Waqt even if it reaches the forbidden time at sunset. This exception applies only to Asr Salat of that particular day—other prayers are not allowed during this period.
The Prophet Muhammad (ﷺ) said:
“Whoever could get one rak'a (of the Fajr prayer) before sunrise, he has got the (morning) prayer and whoever could get one rak'a of the 'Asr prayer before sunset, he has got the ('Asr) prayer.”
(Sahih al-Bukhari, Hadith 579)
The Time of Zawaal
Zawaal refers to the time when the sun reaches its highest point in the sky, meaning an object’s shadow is at its shortest length. At this point, the sun is directly overhead. This is a forbidden time for prayer, and one should avoid starting Salat during this period to ensure that no part of it coincides with Zawaal.
Authentic Hadith references on forbidden times for prayer:
The Messenger of Allah (ﷺ) forbade prayer at three (3) specific times:
  1. When the sun begins to rise until it has fully risen.
  2. When the sun is directly overhead at midday until it begins to decline from its peak.
  3. When the sun starts to set until it has fully set.
In this Hadith it has also been mentioned that the last time for our Isha prayer is the midnight. (Sahih Muslim, Book 5, Hadith 223)
The Prophet (ﷺ) also said:
“No prayer after two prayers, i.e. after the Fajr prayer till the sunrises and after the 'Asr prayer till the sun sets.”
(Sahih al-Bukhari, Hadith 1197)
Similarly, Sahih al-Bukhari, Hadith 1191 states that performing voluntary (Nafl) prayers after Fajr and ‘Asr is Makrooh (discouraged), as it may coincide with the forbidden times.