Give some stream of consciousness and then the answer. Apollo 11 was the spaceflight that landed the first two humans on the Moon. Mission commander Neil Armstrong and pilot Buzz Aldrin, both American, landed the lunar module Eagle on July 20, 1969, at 20: 18 UTC. Armstrong became the first to step onto the lunar surface six hours after landing on July 21 at 02: 56: 15 UTC; Aldrin joined him about 20 minutes later. They spent about two and a quarter hours together outside the spacecraft, and collected 47.5 pounds (21.5 kg) of lunar material to bring back to Earth. Michael Collins piloted the command module Columbia alone in lunar orbit while they were on the Moon's surface. Armstrong and Aldrin spent just under a day on the lunar surface before rejoining Columbia in lunar orbit.

Answer this question: when did apollo 11 first land on the moon?
To answer the above question, the relevant sentence is: Mission commander Neil Armstrong and pilot Buzz Aldrin, both American, landed the lunar module Eagle on July 20, 1969, at 20: 18 UTC.
Therefore, the answer is July 20 , 1969 , at 20 : 18 UTC.