Do a practical compatibility check when one or both birth times are missing, with clear limits on what astrology can reliably confirm.
Without exact time, the report can still compare Moon sign when reliable, nakshatra if the Moon did not change that day, broad planetary chemistry, and red flags that need exact time confirmation.
Birth time affects the ascendant, house placements, divisional charts, and sometimes the Moon nakshatra. That is why no-time matching should be presented as a preliminary screen.
Many users do not know birth time, especially for older records. This query is high-intent and underserved compared with generic kundali matching pages.