Benefit: The Specified Times for the Morning and Afternoon/Night Adhkar
In the Name of Allāh, the Ever Merciful, the Bestower of Mercy
The time for the morning adhkar [begins] from dawn, and the time for the afternoon/night adhkar [begins] from the diminishing of the sun, Ẓhuhr time. All of this is the time in which adhkar is done. All of them [i.e. the adhkar] performed at these times: after the diminishing [of the sun, Ẓhuhr time], after Ẓhuhr [i.e. after the Ẓhuhr ṣalāh], after ʿAṣr [i.e. after the ʿAṣr ṣalāh], after Maghrib [i.e. after the Maghrib ṣalāh] are [considered to be] the night [adhkar].
Therefore, if he makes the adhkar anytime in the night, then he has accomplished making it in its time. Likewise, the morning [adhkar]. If dawn appears [and] he makes the adhkar immediately after dawn—after the Fajr ṣalāh, after sunrise up until the sun is in the middle of the sky [this occurs just before the Ẓhuhr ṣalāh]—then all of this is the time for the morning adhkar.
Source: وقت أذكار الصباح والمساء
Translated by: Musa Shaleem Mohammed