dua for marriage”,Read the above dua with the Niyyah of finding a wife or husband and the Best time is at Fajr. As Fajr is when Dunya Rizq or needs and it gives flow or Madat-Help of Dunya Support or needs. While making Dhikr at Asr gives rise to the Rizq of Spiritual Openings of the Heart and it gives flow or Madat-Help of Akhira Support or needs, As Sayyidun Adam was created at Asr time.
From Imam Haddad … be extremely careful to always keep alive the periods between the dawn–fajr and sunrise-(salat al-Ishraq is 15mins after is sunrise), and between the afternoon prayer-‘Asr and Maghirb-sunset for these are noble times where those servants who turn to Allah receive the flow of assistance-(Madaad or madaat).
The time following the dawn prayer-Fajr when kept alive, has a powerful and specific effect in attracting material provision-Riqz, whereas, the time following the afternoon prayer-‘Asr if kept alive, has the powerful effect in attracting provision-Rizq for the heart-Rizq (also means knowledge). Taken from Imam Haddad’s book ‘Two treatises mutual Reminding and Good Manners’ in section from Good Manners Chapter 8’.