What is the proper time to pray "Israk" & "Chast" Prayer?.

Praise be to Allaah.
Ishraaq (“ishrak”) prayer is Duha (“chast”) prayer
offered at the beginning of its time. These are not
two different prayers. It is called Ishraaq because
it is done immediately after sunrise (shurooq) when
the sun has risen to a certain height.
Shaykh Ibn Baaz said:
Ishraaq prayer is Duha prayer done at the
beginning of its time.
Majmoo’ Fataawa al-Shaykh Ibn Baaz, 11/401
The time of Duha prayer is from the time when the
sun has risen to a certain height, until just before
the time for Zuhr prayer.
Shaykh Ibn ‘Uthaymeen defined it as being from a
quarter of an hour after the sun has risen until ten
minutes before Zuhr prayer.
Al-Sharh al-Mumti’, 4/122
So all of this period is the time for Duha prayer.
It is better to pray it after the sun’s heat has
become intense, because the Prophet (peace and
blessings of Allaah be upon him) said: “It is
preferable to offer Duha prayer when the sun’s heat
has become so intense that even the young of the
camels feel it.”
Narrated by Muslim, 748
Ibn Baaz: Majmoo’ Fataawa, 11/395
The scholars defined this as being when one
quarter of the day has passed, i.e., halfway
between sunrise and Zuhr prayer.
See al-Majmoo’ by al-Nawawi, 4/36; al-
Mawsoo’ah al-Fiqhiyyah, 27/224
Q : Is that mean that Ishraq nd Chast r two names
of one prayer sis?? And when if we read this prayer
then we can we make niyyah for Ishraq or Chast??
A : Shaykh Ibn ‘Uthaymeen (may Allah be pleased
with him) was asked about Ishraaq and Duha
prayer, and replied: The Sunnah of Ishraaq is (the
same as) the Sunnah of Duha, but if it is done
early, from the time when the sun has risen to the
height of a spear, then it is Ishraaq prayer; if it is
done at the end of its time or in the middle of its
time, then it is Duha prayer. But it is (all) Duha
prayer, because the scholars (may Allah be pleased
with them) said that the time of Duha prayer lasts
from when the sun has risen to the height of a
spear until just before the zenith.
End quote from Liqa’ al-Baab al-Maftooh, 141/24.
Jazak Allah Khair to sister Ukht Sauda for
gathering this post Article.