ad-Duhā is interpreted in three ways:
1. ad-Duhā is used in the sense of 'daytime', as in the following verses:
Or were the people of those towns secure from Our punishment coming to them in the forenoon (duḥā, that is, any time of the day when they would gather)? (al-Aʿrāf 7:98)
At the forenoon (duḥā, that is, any time of the day when people gather)... (Ṭā Hā 20:59)
2. Duḥā means the early hours of the day, as in the following verses:
By the morning brightness (duḥā, that is, the early part of the day when the sun begins to rise) and [by] the night when it covers with darkness... (ad-Duḥā 93:1-2)
On the Day they see it, it will be as if they had not remained [in the world] except for an evening or its forenoon (duḥā, that is, the early part of the day when the sun begins to rise). (an-Nāziʿāt 79:46)
3. ad-Duhā means the heat of the sun, as in the following verses:
By the sun and its brightness (duḥā, that is, its heat)... (ash-Shams 91:1)
And you will not be thirsty therein nor will you suffer from the sun's heat (lā taḍḥā, that is, you will not feel the sun's disturbing rays and heat / you will not be exposed to the sun's heat). (Ṭā Hā 20:119)