No prayer is valid after the 'Asr prayer till the sun sets and no prayer is valid after the dawn prayer till the sun rises.
Sahih Muslim Book 6, Hadith 351
← Previous Hadith This hadith has been narrated by Qatada with the same chain of transmitters with a minor alteration of words.

Sahih Muslim Book 6, Hadith 350 Next Hadith → Let not any one of you intend to observe prayer at the time of the rising of the sun or of the setting sun.

Sahih Muslim Book 6, Hadith 352